ridibooks.com website information.
ridibooks.com domain name is registered by .COM top-level domain registry. See the other sites registred in .COM domain zone.
Following name servers are specified for ridibooks.com domain:
- dawn.ns.cloudflare.com
- sid.ns.cloudflare.com
and probably website ridibooks.com is hosted by WIKIMEDIA - Wikimedia Foundation Inc., US web hosting company. Check the complete list of other most popular websites hosted by WIKIMEDIA - Wikimedia Foundation Inc., US hosting company.
According to Alexa traffic rank the highest website ridibooks.com position was 131742 (in the world). The lowest Alexa rank position was 232043. Now website ridibooks.com ranked in Alexa database as number 228186 (in the world).
Website ridibooks.com Desktop speed measurement score (48/100) is better than the results of 21.82% of other sites shows that the page desktop performance can be improved.
ridibooks.com Mobile usability score (98/100) is better than the results of 55.61% of other sites and means that the page is mobile-friendly.
Mobile speed measurement score of ridibooks.com (50/100) is better than the results of 33.92% of other sites and shows that the landing page performance on mobile devices is poor and can be improved.
Weekly Rank Report
| Date | Rank | Change |
|---|---|---|
| Apr-25-2024 | 228,186 | 0 |
| Apr-24-2024 | 228,186 | 0 |
| Apr-23-2024 | 228,186 | 3,148 |
| Apr-22-2024 | 231,334 | -1,264 |
| Apr-21-2024 | 230,070 | 1,973 |
| Apr-20-2024 | 232,043 | 0 |
| Apr-19-2024 | 232,043 | -795 |
Advertisement
ridibooks.com Rank History
Alexa can identify the popularity of a website as well as its competitors. It is important for website owners and bloggers to know their Alexa ranking because it shows how many visitors have viewed their web page. It gives them a clear idea of how popular their website is on the internet and the ranking of their competitors.
ridibooks.com whois
WHOIS is a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system, but is also used for a wider range of other information.
Domain Name: RIDIBOOKS.COM
Registry Domain ID: 1572013290_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.godaddy.com
Registrar URL: http://www.godaddy.com
Updated Date: 2019-09-19T05:11:51Z
Creation Date: 2009-10-12T13:59:54Z
Registry Expiry Date: 2027-10-12T13:59:54Z
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: abuse@godaddy.com
Registrar Abuse Contact Phone: 480-624-2505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Name Server: DAWN.NS.CLOUDFLARE.COM
Name Server: SID.NS.CLOUDFLARE.COM
DNSSEC: signedDelegation
DNSSEC DS Data: 2371 13 2 8FF2B3D60BC00B501475F6B5623B74A45E1839757B2BC77652BD49F5B6D0B3D6
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2021-04-25T07:59:14Z
ridibooks.com server information
ridibooks.com desktop page speed rank
Last tested: 2018-06-02
Desktop Speed
Bad
48/100
ridibooks.com Desktop Speed Test Quick Summary
priority - 99 Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 971.6KiB (62% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…4023_1527648023756.jpg could save 114.5KiB (79% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…2837_1527830917115.jpg could save 96.1KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…1122_1526267482069.jpg could save 74.2KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…1947_1527736787850.jpg could save 65.7KiB (69% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…4647_1527648407491.jpg could save 51.8KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…1410_1527650050833.jpg could save 49.1KiB (69% reduction).
Compressing and resizing https://static.ridibooks.com/books/dist/images/cert/first_brand.png could save 40.4KiB (94% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1780000120/xlarge could save 39.3KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1780000119/xlarge could save 33.4KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/371001361/xlarge could save 33.2KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/593000426/xlarge could save 28.5KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1508005038/xlarge could save 26.4KiB (85% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1242000539/xlarge could save 22.3KiB (86% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1546000417/xlarge could save 17.3KiB (79% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/510000730/xlarge could save 15.9KiB (82% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/734001589/xlarge could save 13.4KiB (86% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527736787850.jpg could save 11.1KiB (79% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527648023756.jpg could save 11KiB (78% reduction).
Compressing https://misc.ridibooks.com/cover/120039327/xlarge could save 10.8KiB (31% reduction).
Compressing https://misc.ridibooks.com/cover/856000125/large could save 9.9KiB (38% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1526267482069.jpg could save 9.8KiB (76% reduction).
Compressing https://misc.ridibooks.com/cover/682000731/large could save 9.6KiB (40% reduction).
Compressing https://misc.ridibooks.com/cover/606001783/large could save 9.6KiB (43% reduction).
Compressing https://misc.ridibooks.com/cover/372003171/large could save 9.2KiB (40% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527830917115.jpg could save 8.6KiB (73% reduction).
Compressing https://misc.ridibooks.com/cover/371001361/large could save 7.7KiB (35% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527650050833.jpg could save 7.6KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527648407491.jpg could save 7.4KiB (74% reduction).
Compressing https://misc.ridibooks.com/cover/1896000039/large could save 7.2KiB (36% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/509000964/xlarge could save 6.7KiB (78% reduction).
Compressing https://misc.ridibooks.com/cover/1013000005/large could save 6.4KiB (34% reduction).
Compressing https://misc.ridibooks.com/cover/3157000007/large could save 6.3KiB (38% reduction).
Compressing https://misc.ridibooks.com/cover/510000737/large could save 6.2KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/280000103/large could save 6.2KiB (37% reduction).
Compressing https://misc.ridibooks.com/cover/745000097/large could save 6.1KiB (37% reduction).
Compressing https://misc.ridibooks.com/cover/754013881/large could save 5.9KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/620000154/large could save 5.7KiB (31% reduction).
Compressing https://misc.ridibooks.com/cover/998000302/large could save 5.5KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/1508005038/large could save 5.3KiB (29% reduction).
Compressing https://misc.ridibooks.com/cover/3331000001/large could save 4.9KiB (36% reduction).
Compressing https://misc.ridibooks.com/cover/754023554/large could save 4.7KiB (28% reduction).
Compressing https://misc.ridibooks.com/cover/754023566/large could save 4.2KiB (34% reduction).
Compressing https://misc.ridibooks.com/cover/372003172/large could save 4KiB (34% reduction).
Compressing https://misc.ridibooks.com/cover/1818003303/small could save 3.9KiB (41% reduction).
Compressing https://misc.ridibooks.com/cover/372003171/small could save 3.8KiB (42% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/749000075/small could save 3.3KiB (73% reduction).
Compressing https://misc.ridibooks.com/cover/371001735/large could save 3.2KiB (32% reduction).
Compressing https://misc.ridibooks.com/cover/687000054/small could save 3.2KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/793001084/large could save 3.2KiB (24% reduction).
Compressing https://misc.ridibooks.com/cover/606001674/small could save 2.7KiB (37% reduction).
Compressing https://misc.ridibooks.com/cover/2409000001/small could save 2.7KiB (36% reduction).
Compressing https://misc.ridibooks.com/cover/1242000542/large could save 2.5KiB (16% reduction).
Compressing https://misc.ridibooks.com/cover/1540000001/small could save 2.5KiB (36% reduction).
Compressing https://misc.ridibooks.com/cover/2324000038/large could save 2.5KiB (33% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601669.png could save 2.3KiB (72% reduction).
Compressing https://misc.ridibooks.com/cover/862000638/small could save 2.1KiB (27% reduction).
Compressing https://misc.ridibooks.com/cover/862000630/small could save 1.9KiB (39% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601628.png could save 1.8KiB (74% reduction).
Compressing https://misc.ridibooks.com/cover/734001482/small could save 1.7KiB (28% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601565.png could save 1.6KiB (74% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601508.png could save 1.5KiB (76% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180424171414_759328.png could save 1.2KiB (56% reduction).
Compressing https://misc.ridibooks.com/cover/510000158/small could save 1.1KiB (28% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180424171031_746070.png could save 990B (59% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180425112817_969968.png could save 907B (55% reduction).
Compressing https://misc.ridibooks.com/cover/1546000417/small could save 828B (15% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180531181846_920495.png could save 642B (56% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180424171605_609869.png could save 313B (51% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…2837_1527830917115.jpg could save 96.1KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…1122_1526267482069.jpg could save 74.2KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…1947_1527736787850.jpg could save 65.7KiB (69% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…4647_1527648407491.jpg could save 51.8KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…1410_1527650050833.jpg could save 49.1KiB (69% reduction).
Compressing and resizing https://static.ridibooks.com/books/dist/images/cert/first_brand.png could save 40.4KiB (94% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1780000120/xlarge could save 39.3KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1780000119/xlarge could save 33.4KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/371001361/xlarge could save 33.2KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/593000426/xlarge could save 28.5KiB (87% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1508005038/xlarge could save 26.4KiB (85% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1242000539/xlarge could save 22.3KiB (86% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/1546000417/xlarge could save 17.3KiB (79% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/510000730/xlarge could save 15.9KiB (82% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/734001589/xlarge could save 13.4KiB (86% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527736787850.jpg could save 11.1KiB (79% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527648023756.jpg could save 11KiB (78% reduction).
Compressing https://misc.ridibooks.com/cover/120039327/xlarge could save 10.8KiB (31% reduction).
Compressing https://misc.ridibooks.com/cover/856000125/large could save 9.9KiB (38% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1526267482069.jpg could save 9.8KiB (76% reduction).
Compressing https://misc.ridibooks.com/cover/682000731/large could save 9.6KiB (40% reduction).
Compressing https://misc.ridibooks.com/cover/606001783/large could save 9.6KiB (43% reduction).
Compressing https://misc.ridibooks.com/cover/372003171/large could save 9.2KiB (40% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527830917115.jpg could save 8.6KiB (73% reduction).
Compressing https://misc.ridibooks.com/cover/371001361/large could save 7.7KiB (35% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527650050833.jpg could save 7.6KiB (72% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_top_banner/…ling_1527648407491.jpg could save 7.4KiB (74% reduction).
Compressing https://misc.ridibooks.com/cover/1896000039/large could save 7.2KiB (36% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/509000964/xlarge could save 6.7KiB (78% reduction).
Compressing https://misc.ridibooks.com/cover/1013000005/large could save 6.4KiB (34% reduction).
Compressing https://misc.ridibooks.com/cover/3157000007/large could save 6.3KiB (38% reduction).
Compressing https://misc.ridibooks.com/cover/510000737/large could save 6.2KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/280000103/large could save 6.2KiB (37% reduction).
Compressing https://misc.ridibooks.com/cover/745000097/large could save 6.1KiB (37% reduction).
Compressing https://misc.ridibooks.com/cover/754013881/large could save 5.9KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/620000154/large could save 5.7KiB (31% reduction).
Compressing https://misc.ridibooks.com/cover/998000302/large could save 5.5KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/1508005038/large could save 5.3KiB (29% reduction).
Compressing https://misc.ridibooks.com/cover/3331000001/large could save 4.9KiB (36% reduction).
Compressing https://misc.ridibooks.com/cover/754023554/large could save 4.7KiB (28% reduction).
Compressing https://misc.ridibooks.com/cover/754023566/large could save 4.2KiB (34% reduction).
Compressing https://misc.ridibooks.com/cover/372003172/large could save 4KiB (34% reduction).
Compressing https://misc.ridibooks.com/cover/1818003303/small could save 3.9KiB (41% reduction).
Compressing https://misc.ridibooks.com/cover/372003171/small could save 3.8KiB (42% reduction).
Compressing and resizing https://misc.ridibooks.com/cover/749000075/small could save 3.3KiB (73% reduction).
Compressing https://misc.ridibooks.com/cover/371001735/large could save 3.2KiB (32% reduction).
Compressing https://misc.ridibooks.com/cover/687000054/small could save 3.2KiB (35% reduction).
Compressing https://misc.ridibooks.com/cover/793001084/large could save 3.2KiB (24% reduction).
Compressing https://misc.ridibooks.com/cover/606001674/small could save 2.7KiB (37% reduction).
Compressing https://misc.ridibooks.com/cover/2409000001/small could save 2.7KiB (36% reduction).
Compressing https://misc.ridibooks.com/cover/1242000542/large could save 2.5KiB (16% reduction).
Compressing https://misc.ridibooks.com/cover/1540000001/small could save 2.5KiB (36% reduction).
Compressing https://misc.ridibooks.com/cover/2324000038/large could save 2.5KiB (33% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601669.png could save 2.3KiB (72% reduction).
Compressing https://misc.ridibooks.com/cover/862000638/small could save 2.1KiB (27% reduction).
Compressing https://misc.ridibooks.com/cover/862000630/small could save 1.9KiB (39% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601628.png could save 1.8KiB (74% reduction).
Compressing https://misc.ridibooks.com/cover/734001482/small could save 1.7KiB (28% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601565.png could save 1.6KiB (74% reduction).
Compressing and resizing https://active.ridibooks.com/ridibooks_special_room/icon/1469601508.png could save 1.5KiB (76% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180424171414_759328.png could save 1.2KiB (56% reduction).
Compressing https://misc.ridibooks.com/cover/510000158/small could save 1.1KiB (28% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180424171031_746070.png could save 990B (59% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180425112817_969968.png could save 907B (55% reduction).
Compressing https://misc.ridibooks.com/cover/1546000417/small could save 828B (15% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180531181846_920495.png could save 642B (56% reduction).
Compressing and resizing https://active.ridibooks.com/quick-menu/20180424171605_609869.png could save 313B (51% reduction).
priority - 12 Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 1 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
Optimize CSS Delivery of the following:
https://static.ridibooks.com/books/dist/css/page_base.css?20180601174121
priority - 3 Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://www.googletagmanager.com/gtm.js?id=GTM-N4FWT2 (15 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/826424…0066?v=2.8.14&r=stable (20 minutes)
https://wcs.naver.net/wcslog.js (22.6 minutes)
https://www.google-analytics.com/plugins/ua/ec.js (60 minutes)
https://www.googleadservices.com/pagead/conversion.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/826424…0066?v=2.8.14&r=stable (20 minutes)
https://wcs.naver.net/wcslog.js (22.6 minutes)
https://www.google-analytics.com/plugins/ua/ec.js (60 minutes)
https://www.googleadservices.com/pagead/conversion.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
priority - 3 Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://ridibooks.com/
https://ridibooks.com/
https://ridibooks.com/?genre=general
https://ridibooks.com/
https://ridibooks.com/?genre=general
priority - 1 Reduce server response time
In our test, your server responded in 0.28 seconds. There are many factors that can slow down your server response time. Please read our recommendations to learn how you can monitor and measure where your server is spending the most time.
priority - 0 Minify JavaScript
Compacting JavaScript code can save many bytes of data and speed up downloading, parsing, and execution time.
Minify JavaScript for the following resources to reduce their size by 110B (12% reduction).
Minifying https://static.ridibooks.com/books/dist/vendors.pc.min.js?20180601174145 could save 110B (12% reduction) after compression.
ridibooks.com Desktop Resources
| Total Resources | 122 |
| Number of Hosts | 18 |
| Static Resources | 102 |
| JavaScript Resources | 27 |
| CSS Resources | 7 |
ridibooks.com Desktop Resource Breakdown
ridibooks.com mobile page speed rank
Last tested: 2019-12-07
Mobile Speed
Bad
50/100
ridibooks.com Mobile Speed Test Quick Summary
priority - 64 Eliminate render-blocking JavaScript and CSS in above-the-fold content
Your page has 13 blocking script resources and 5 blocking CSS resources. This causes a delay in rendering your page.
None of the above-the-fold content on your page could be rendered without waiting for the following resources to load. Try to defer or asynchronously load blocking resources, or inline the critical portions of those resources directly in the HTML.
Remove render-blocking JavaScript:
https://store.ridicdn.net/books/dist/polyfill.min.js?20191112185051
https://store.ridicdn.net/books/dist/vendors.webpack.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.common.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.common2.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.m.min.js?20191206201442
https://store.ridicdn.net/store/dist/manifest.min.js?20191206201357
https://store.ridicdn.net/store/dist/common.min.js?20191206201357
https://store.ridicdn.net/store/dist/vendor.min.js?20191206201357
https://store.ridicdn.net/books/dist/rui.min.js?20191206201126
https://store.ridicdn.net/books/dist/ridi.common.min.js?20191206201442
https://store.ridicdn.net/books/dist/ridi.common2.min.js?20191206201442
https://store.ridicdn.net/books/dist/ridi.m.min.js?20191206201442
https://store.ridicdn.net/books/dist/home.m.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.webpack.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.common.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.common2.min.js?20191206201442
https://store.ridicdn.net/books/dist/vendors.m.min.js?20191206201442
https://store.ridicdn.net/store/dist/manifest.min.js?20191206201357
https://store.ridicdn.net/store/dist/common.min.js?20191206201357
https://store.ridicdn.net/store/dist/vendor.min.js?20191206201357
https://store.ridicdn.net/books/dist/rui.min.js?20191206201126
https://store.ridicdn.net/books/dist/ridi.common.min.js?20191206201442
https://store.ridicdn.net/books/dist/ridi.common2.min.js?20191206201442
https://store.ridicdn.net/books/dist/ridi.m.min.js?20191206201442
https://store.ridicdn.net/books/dist/home.m.min.js?20191206201442
Optimize CSS Delivery of the following:
https://store.ridicdn.net/books/dist/css/page_base.m.css?20191206201259
https://store.ridicdn.net/books/dist/css/external_…e.m.css?20191206201317
https://store.ridicdn.net/store/dist/base.m.css?20191206201229
https://store.ridicdn.net/books/dist/css/page_home.m.css?20191206201307
https://store.ridicdn.net/store/dist/home.m.css?20191206201228
https://store.ridicdn.net/books/dist/css/external_…e.m.css?20191206201317
https://store.ridicdn.net/store/dist/base.m.css?20191206201229
https://store.ridicdn.net/books/dist/css/page_home.m.css?20191206201307
https://store.ridicdn.net/store/dist/home.m.css?20191206201228
priority - 29 Optimize images
Properly formatting and compressing images can save many bytes of data.
Optimize the following images to reduce their size by 286.9KiB (22% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…0112_1575162072737.jpg could save 23.9KiB (36% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…1057_1575162657511.jpg could save 21.6KiB (37% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…4032_1574923232205.jpg could save 19.2KiB (38% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…5851_1570431531940.jpg could save 16KiB (37% reduction).
Compressing https://img.ridicdn.net/cover/2119000086/xxlarge could save 14.6KiB (17% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…0337_1573700617139.jpg could save 13.9KiB (28% reduction).
Compressing https://img.ridicdn.net/cover/280000131/xxlarge could save 12.4KiB (18% reduction).
Compressing https://active.ridibooks.com/ridibooks_banner_book…6143424_1510810464.jpg could save 11.7KiB (55% reduction).
Compressing https://img.ridicdn.net/cover/749000261/xxlarge could save 10KiB (16% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…1225_1575375145299.jpg could save 9.9KiB (34% reduction).
Compressing https://img.ridicdn.net/cover/606002033/xxlarge could save 9.8KiB (20% reduction).
Compressing https://img.ridicdn.net/cover/749000260/xxlarge could save 9.5KiB (20% reduction).
Compressing https://img.ridicdn.net/cover/754012650/xlarge could save 9.2KiB (22% reduction).
Compressing https://img.ridicdn.net/cover/372005645/xxlarge could save 8.4KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/593000615/xlarge could save 5.3KiB (20% reduction).
Compressing https://img.ridicdn.net/cover/1691000053/xlarge could save 5.1KiB (19% reduction).
Compressing https://img.ridicdn.net/cover/1890000160/xlarge could save 4.5KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/1184000128/xlarge could save 4.4KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/1780000203/xlarge could save 4.3KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/682000318/xlarge could save 4.2KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/2639000028/xlarge could save 4.1KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/1570000154/xlarge could save 4.1KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/2639000029/xxlarge could save 3.9KiB (14% reduction).
Compressing https://img.ridicdn.net/cover/593000520/xlarge could save 3.7KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/1546000567/xlarge could save 3.6KiB (19% reduction).
Compressing https://img.ridicdn.net/cover/111018202/xlarge could save 3.6KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/111012228/xlarge could save 3.6KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/371001247/xlarge could save 3.4KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/1242000891/xlarge could save 3.3KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/111018169/xlarge could save 3.3KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/1546000541/xlarge could save 3.2KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/682000396/xlarge could save 3KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/1558000266/xlarge could save 3KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/1558000259/xlarge could save 2.9KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/849000046/xlarge could save 2.8KiB (14% reduction).
Compressing https://img.ridicdn.net/cover/111018191/xlarge could save 2.8KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/509000302/xlarge could save 2KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/111014690/xlarge could save 1.4KiB (13% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601628.png could save 1.2KiB (47% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601669.png could save 1.1KiB (35% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601508.png could save 1KiB (51% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601565.png could save 1KiB (48% reduction).
Compressing https://img.ridicdn.net/cover/1546000541/small could save 964B (15% reduction).
Compressing https://img.ridicdn.net/cover/754010191/small could save 943B (16% reduction).
Compressing https://img.ridicdn.net/cover/2189000079/small could save 754B (15% reduction).
Compressing https://img.ridicdn.net/cover/1648000234/small could save 632B (13% reduction).
Compressing https://img.ridicdn.net/cover/1818000910/small could save 584B (12% reduction).
Compressing https://active.ridibooks.com/quick-menu/20191108151400_653898.png could save 533B (33% reduction).
Compressing https://img.ridicdn.net/cover/1780000205/small could save 513B (12% reduction).
Compressing https://img.ridicdn.net/cover/1242000844/small could save 509B (14% reduction).
Compressing https://img.ridicdn.net/cover/606001759/small could save 458B (14% reduction).
Compressing https://active.ridibooks.com/quick-menu/20180727180225_665867.png could save 362B (33% reduction).
Compressing https://active.ridibooks.com/quick-menu/20190617163348_367908.png could save 248B (30% reduction).
Compressing https://active.ridibooks.com/quick-menu/20191002184608_872156.png could save 193B (28% reduction).
Compressing https://active.ridibooks.com/quick-menu/20191205125854_335877.png could save 166B (29% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…1057_1575162657511.jpg could save 21.6KiB (37% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…4032_1574923232205.jpg could save 19.2KiB (38% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…5851_1570431531940.jpg could save 16KiB (37% reduction).
Compressing https://img.ridicdn.net/cover/2119000086/xxlarge could save 14.6KiB (17% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…0337_1573700617139.jpg could save 13.9KiB (28% reduction).
Compressing https://img.ridicdn.net/cover/280000131/xxlarge could save 12.4KiB (18% reduction).
Compressing https://active.ridibooks.com/ridibooks_banner_book…6143424_1510810464.jpg could save 11.7KiB (55% reduction).
Compressing https://img.ridicdn.net/cover/749000261/xxlarge could save 10KiB (16% reduction).
Compressing https://active.ridibooks.com/ridibooks_top_banner/…1225_1575375145299.jpg could save 9.9KiB (34% reduction).
Compressing https://img.ridicdn.net/cover/606002033/xxlarge could save 9.8KiB (20% reduction).
Compressing https://img.ridicdn.net/cover/749000260/xxlarge could save 9.5KiB (20% reduction).
Compressing https://img.ridicdn.net/cover/754012650/xlarge could save 9.2KiB (22% reduction).
Compressing https://img.ridicdn.net/cover/372005645/xxlarge could save 8.4KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/593000615/xlarge could save 5.3KiB (20% reduction).
Compressing https://img.ridicdn.net/cover/1691000053/xlarge could save 5.1KiB (19% reduction).
Compressing https://img.ridicdn.net/cover/1890000160/xlarge could save 4.5KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/1184000128/xlarge could save 4.4KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/1780000203/xlarge could save 4.3KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/682000318/xlarge could save 4.2KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/2639000028/xlarge could save 4.1KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/1570000154/xlarge could save 4.1KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/2639000029/xxlarge could save 3.9KiB (14% reduction).
Compressing https://img.ridicdn.net/cover/593000520/xlarge could save 3.7KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/1546000567/xlarge could save 3.6KiB (19% reduction).
Compressing https://img.ridicdn.net/cover/111018202/xlarge could save 3.6KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/111012228/xlarge could save 3.6KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/371001247/xlarge could save 3.4KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/1242000891/xlarge could save 3.3KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/111018169/xlarge could save 3.3KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/1546000541/xlarge could save 3.2KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/682000396/xlarge could save 3KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/1558000266/xlarge could save 3KiB (17% reduction).
Compressing https://img.ridicdn.net/cover/1558000259/xlarge could save 2.9KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/849000046/xlarge could save 2.8KiB (14% reduction).
Compressing https://img.ridicdn.net/cover/111018191/xlarge could save 2.8KiB (18% reduction).
Compressing https://img.ridicdn.net/cover/509000302/xlarge could save 2KiB (16% reduction).
Compressing https://img.ridicdn.net/cover/111014690/xlarge could save 1.4KiB (13% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601628.png could save 1.2KiB (47% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601669.png could save 1.1KiB (35% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601508.png could save 1KiB (51% reduction).
Compressing https://active.ridibooks.com/ridibooks_special_room/icon/1469601565.png could save 1KiB (48% reduction).
Compressing https://img.ridicdn.net/cover/1546000541/small could save 964B (15% reduction).
Compressing https://img.ridicdn.net/cover/754010191/small could save 943B (16% reduction).
Compressing https://img.ridicdn.net/cover/2189000079/small could save 754B (15% reduction).
Compressing https://img.ridicdn.net/cover/1648000234/small could save 632B (13% reduction).
Compressing https://img.ridicdn.net/cover/1818000910/small could save 584B (12% reduction).
Compressing https://active.ridibooks.com/quick-menu/20191108151400_653898.png could save 533B (33% reduction).
Compressing https://img.ridicdn.net/cover/1780000205/small could save 513B (12% reduction).
Compressing https://img.ridicdn.net/cover/1242000844/small could save 509B (14% reduction).
Compressing https://img.ridicdn.net/cover/606001759/small could save 458B (14% reduction).
Compressing https://active.ridibooks.com/quick-menu/20180727180225_665867.png could save 362B (33% reduction).
Compressing https://active.ridibooks.com/quick-menu/20190617163348_367908.png could save 248B (30% reduction).
Compressing https://active.ridibooks.com/quick-menu/20191002184608_872156.png could save 193B (28% reduction).
Compressing https://active.ridibooks.com/quick-menu/20191205125854_335877.png could save 166B (29% reduction).
priority - 10 Avoid landing page redirects
Your page has 2 redirects. Redirects introduce additional delays before the page can be loaded.
Avoid landing page redirects for the following chain of redirected URLs.
http://ridibooks.com/
https://ridibooks.com/
https://ridibooks.com/?genre=general
https://ridibooks.com/
https://ridibooks.com/?genre=general
priority - 6 Leverage browser caching
Setting an expiry date or a maximum age in the HTTP headers for static resources instructs the browser to load previously downloaded resources from local disk rather than over the network.
Leverage browser caching for the following cacheable resources:
https://www.google-analytics.com/gtm/js?id=GTM-TVK…d=289563204.1575757787 (15 minutes)
https://www.googletagmanager.com/gtm.js?id=GTM-N4FWT2 (15 minutes)
https://wcs.naver.net/wcslog.js (18.7 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/369643…7452?v=2.9.14&r=stable (20 minutes)
https://connect.facebook.net/signals/config/826424…0066?v=2.9.14&r=stable (20 minutes)
https://www.google-analytics.com/plugins/ua/ec.js (60 minutes)
https://www.googleadservices.com/pagead/conversion.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
https://www.googletagmanager.com/gtm.js?id=GTM-N4FWT2 (15 minutes)
https://wcs.naver.net/wcslog.js (18.7 minutes)
https://connect.facebook.net/en_US/fbevents.js (20 minutes)
https://connect.facebook.net/signals/config/369643…7452?v=2.9.14&r=stable (20 minutes)
https://connect.facebook.net/signals/config/826424…0066?v=2.9.14&r=stable (20 minutes)
https://www.google-analytics.com/plugins/ua/ec.js (60 minutes)
https://www.googleadservices.com/pagead/conversion.js (60 minutes)
https://www.google-analytics.com/analytics.js (2 hours)
priority - 1 Reduce server response time
In our test, your server responded in 0.29 seconds.
There are many factors that can slow down your server response time. Please read our recommendations to learn how you can monitor and measure where your server is spending the most time.
ridibooks.com Mobile Resources
| Total Resources | 114 |
| Number of Hosts | 18 |
| Static Resources | 89 |
| JavaScript Resources | 29 |
| CSS Resources | 5 |
ridibooks.com Mobile Resource Breakdown
ridibooks.com mobile page usability
Last tested: 2019-12-07
Mobile Usability
Good
98/100
ridibooks.com Mobile Usability Test Quick Summary
priority - 1 Size tap targets appropriately
Some of the links/buttons on your webpage may be too small for a user to easily tap on a touchscreen. Consider making these tap targets larger to provide a better user experience.
The following tap targets are close to other nearby tap targets and may need additional spacing around them.
The tap target
The tap target
The tap target
The tap target
The tap target
The tap target
The tap target
The tap target
The tap target
The tap target
<a href="/author/183" class="js_author_deta…or_detail_link">이원재</a> and 3 others are close to other tap targets.The tap target
<div class="hot_release_bo…_110 trackable">상세페이지 바로가기…정인성</div> is close to 1 other tap targets.The tap target
<a href="/v2/Detail?id=2639000029" class="thumbnail_btn trackable">상세페이지 바로가기</a> is close to 1 other tap targets.The tap target
<a href="/v2/Detail?id=2119000086" class="trackable">유령해마</a> is close to 1 other tap targets.The tap target
<a href="/search?q=%EC%…9E%AC%EA%B4%80" class="js_author_deta…or_detail_link">최재관</a> and 18 others are close to other tap targets.The tap target
<a href="/v2/Detail?id=862001259" class="title_link trackable">좀비 썰록</a> is close to 1 other tap targets.The tap target
<button type="button" class="notice_toggle_button">공지사항 리스트 열기/닫기</button> is close to 1 other tap targets.The tap target
<a href="/legal/privacy" class="link_personal">개인 정보 처리 방침</a> is close to 1 other tap targets.The tap target
<a href="/legal/privacy" class="link_personal">개인 정보 처리 방침</a> is close to 1 other tap targets.The tap target
<a href="/legal/youth">청소년 보호 정책</a> and 2 others are close to other tap targets.The tap target
<a href="/legal/youth">청소년 보호 정책</a> and 1 others are close to other tap targets.The tap target
<a href="tel:1644-0331">1644-0331</a> is close to 1 other tap targets.The tap target
<a href="http://map.nav…042023&enc=b64">서울시 강남구 역삼동 70…10층 (테헤란로 325)</a> is close to 2 other tap targets.ridibooks.com similar domains
Similar domains:
www.ridibooks.com
www.ridibooks.net
www.ridibooks.org
www.ridibooks.info
www.ridibooks.biz
www.ridibooks.us
www.ridibooks.mobi
www.idibooks.com
www.ridibooks.com
www.eidibooks.com
www.reidibooks.com
www.eridibooks.com
www.didibooks.com
www.rdidibooks.com
www.dridibooks.com
www.fidibooks.com
www.rfidibooks.com
www.fridibooks.com
www.tidibooks.com
www.rtidibooks.com
www.tridibooks.com
www.rdibooks.com
www.rudibooks.com
www.riudibooks.com
www.ruidibooks.com
www.rjdibooks.com
www.rijdibooks.com
www.rjidibooks.com
www.rkdibooks.com
www.rikdibooks.com
www.rkidibooks.com
www.rodibooks.com
www.riodibooks.com
www.roidibooks.com
www.riibooks.com
www.rixibooks.com
www.ridxibooks.com
www.rixdibooks.com
www.risibooks.com
www.ridsibooks.com
www.risdibooks.com
www.rieibooks.com
www.rideibooks.com
www.riedibooks.com
www.riribooks.com
www.ridribooks.com
www.rirdibooks.com
www.rifibooks.com
www.ridfibooks.com
www.rifdibooks.com
www.ricibooks.com
www.ridcibooks.com
www.ricdibooks.com
www.ridbooks.com
www.ridubooks.com
www.ridiubooks.com
www.riduibooks.com
www.ridjbooks.com
www.ridijbooks.com
www.ridjibooks.com
www.ridkbooks.com
www.ridikbooks.com
www.ridkibooks.com
www.ridobooks.com
www.ridiobooks.com
www.ridoibooks.com
www.ridiooks.com
www.ridivooks.com
www.ridibvooks.com
www.ridivbooks.com
www.ridigooks.com
www.ridibgooks.com
www.ridigbooks.com
www.ridihooks.com
www.ridibhooks.com
www.ridihbooks.com
www.ridinooks.com
www.ridibnooks.com
www.ridinbooks.com
www.ridiboks.com
www.ridibioks.com
www.ridiboioks.com
www.ridibiooks.com
www.ridibkoks.com
www.ridibokoks.com
www.ridibkooks.com
www.ridibloks.com
www.ridiboloks.com
www.ridiblooks.com
www.ridibpoks.com
www.ridibopoks.com
www.ridibpooks.com
www.ridiboiks.com
www.ridibooiks.com
www.ridibokks.com
www.ridibookks.com
www.ridibolks.com
www.ridiboolks.com
www.ridibopks.com
www.ridiboopks.com
www.ridiboos.com
www.ridiboojs.com
www.ridibookjs.com
www.ridiboojks.com
www.ridiboois.com
www.ridibookis.com
www.ridibooms.com
www.ridibookms.com
www.ridiboomks.com
www.ridibools.com
www.ridibookls.com
www.ridibooos.com
www.ridibookos.com
www.ridiboooks.com
www.ridibook.com
www.ridibookw.com
www.ridibooksw.com
www.ridibookws.com
www.ridibooke.com
www.ridibookse.com
www.ridibookes.com
www.ridibookd.com
www.ridibooksd.com
www.ridibookds.com
www.ridibookz.com
www.ridibooksz.com
www.ridibookzs.com
www.ridibookx.com
www.ridibooksx.com
www.ridibookxs.com
www.ridibooka.com
www.ridibooksa.com
www.ridibookas.com
www.ridibooks.con
www.ridibooks.net
www.ridibooks.org
www.ridibooks.info
www.ridibooks.biz
www.ridibooks.us
www.ridibooks.mobi
www.idibooks.com
www.ridibooks.com
www.eidibooks.com
www.reidibooks.com
www.eridibooks.com
www.didibooks.com
www.rdidibooks.com
www.dridibooks.com
www.fidibooks.com
www.rfidibooks.com
www.fridibooks.com
www.tidibooks.com
www.rtidibooks.com
www.tridibooks.com
www.rdibooks.com
www.rudibooks.com
www.riudibooks.com
www.ruidibooks.com
www.rjdibooks.com
www.rijdibooks.com
www.rjidibooks.com
www.rkdibooks.com
www.rikdibooks.com
www.rkidibooks.com
www.rodibooks.com
www.riodibooks.com
www.roidibooks.com
www.riibooks.com
www.rixibooks.com
www.ridxibooks.com
www.rixdibooks.com
www.risibooks.com
www.ridsibooks.com
www.risdibooks.com
www.rieibooks.com
www.rideibooks.com
www.riedibooks.com
www.riribooks.com
www.ridribooks.com
www.rirdibooks.com
www.rifibooks.com
www.ridfibooks.com
www.rifdibooks.com
www.ricibooks.com
www.ridcibooks.com
www.ricdibooks.com
www.ridbooks.com
www.ridubooks.com
www.ridiubooks.com
www.riduibooks.com
www.ridjbooks.com
www.ridijbooks.com
www.ridjibooks.com
www.ridkbooks.com
www.ridikbooks.com
www.ridkibooks.com
www.ridobooks.com
www.ridiobooks.com
www.ridoibooks.com
www.ridiooks.com
www.ridivooks.com
www.ridibvooks.com
www.ridivbooks.com
www.ridigooks.com
www.ridibgooks.com
www.ridigbooks.com
www.ridihooks.com
www.ridibhooks.com
www.ridihbooks.com
www.ridinooks.com
www.ridibnooks.com
www.ridinbooks.com
www.ridiboks.com
www.ridibioks.com
www.ridiboioks.com
www.ridibiooks.com
www.ridibkoks.com
www.ridibokoks.com
www.ridibkooks.com
www.ridibloks.com
www.ridiboloks.com
www.ridiblooks.com
www.ridibpoks.com
www.ridibopoks.com
www.ridibpooks.com
www.ridiboiks.com
www.ridibooiks.com
www.ridibokks.com
www.ridibookks.com
www.ridibolks.com
www.ridiboolks.com
www.ridibopks.com
www.ridiboopks.com
www.ridiboos.com
www.ridiboojs.com
www.ridibookjs.com
www.ridiboojks.com
www.ridiboois.com
www.ridibookis.com
www.ridibooms.com
www.ridibookms.com
www.ridiboomks.com
www.ridibools.com
www.ridibookls.com
www.ridibooos.com
www.ridibookos.com
www.ridiboooks.com
www.ridibook.com
www.ridibookw.com
www.ridibooksw.com
www.ridibookws.com
www.ridibooke.com
www.ridibookse.com
www.ridibookes.com
www.ridibookd.com
www.ridibooksd.com
www.ridibookds.com
www.ridibookz.com
www.ridibooksz.com
www.ridibookzs.com
www.ridibookx.com
www.ridibooksx.com
www.ridibookxs.com
www.ridibooka.com
www.ridibooksa.com
www.ridibookas.com
www.ridibooks.con
ridibooks.com Ping
Ping is a networking utility tool to test if a particular host is reachable. It is a diagnostic that checks reachability of a host on an Internet Protocol (IP) network. In a computer network, a ping test is a way of sending messages from one host to another. Aside from checking if the host is connected to a network, ping also gives indicators of the reliability and general speed of the connection.
ridibooks.com TRACEROUTE
Traceroute is a network diagnostic tool used to track the pathway taken by a packet on an IP network from source to destination. Traceroute also records the time taken for each hop the packet makes during its route to the destination. Traceroute uses ICMP (Internet Control Message Protocol) echo packets with variable time to live values. The response time of each hop is calculated. To guarantee accuracy, each hop is queried multiple times (usually three times) to better measure the response of that particular hop.