Page summary

Summary

Metric	Value
Page metrics
Performance Score	57
Total Page Transfer Size	1.5 MB
Requests	118
Timing metrics
TTFB [median]	784 ms
First Paint [median]	2.787 s
Fully Loaded [median]	14.729 s
Google Web Vitals
TTFB [median]	784 ms
First Contentful Paint (FCP) [median]	2.787 s
Largest Contentful Paint (LCP) [median]	10.693 s
Cumulative Layout Shift (CLS) [median]	0.13
Total Blocking Time [median]	673 ms
Max Potential FID [median]	518 ms
CPU metrics
CPU long tasks [median]	5
CPU longest task duration	537 ms
CPU last long task happens at	12.036 s
Visual Metrics
First Visual Change [median]	2.816 s
Speed Index [median]	9.185 s
Visual Complete 85% [median]	12.033 s
Visual Complete 99% [median]	12.033 s
Last Visual Change [median]	12.033 s

Timings Summary

Waterfall

Run 2 SpeedIndex median

Filmstrip

Use--filmstrip.showAll to show all filmstrips.

0 s

2.7 sCPU Long Task duration 73 ms

2.8 sFirst Contentful Paint 2.757 sFirst Visual Change 2.800 s

2.9 s

3 s

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3.9 sCPU Long Task duration 68 ms

4 sDOM Content Loaded Time 3.923 s

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5.8 sCPU Long Task duration 436 ms

6.3 s

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6.8 sPage Load Time 6.753 s

6.9 s

7 s

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9 s

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9.5 sCPU Long Task duration 188 ms

9.7 s

10.7 sLCP <IMG> 10.693 s

10.8 s

10.9 s

12 sLayout Shift 0.13320 11.997 s

12.1 sLast Visual Change 12.033 sVisual Complete 85% 12.033 sVisual Complete 95% 12.033 sVisual Complete 99% 12.033 s

Coach

The coach helps you find performance problems on your web page using web performance best practice rules. And gives you advice on privacy and best practices. Tested using Coach-core version 8.0.2.

Coach score

• Total score 70
• Performance score 57
• Privacy score 93
• Best practice score 70

Performance advice (57)

Show/hide details

Title	Advice	Score
Avoid slowing down the critical rendering path (avoidRenderBlocking)	The page has 2 blocking requests and 4 in body parser blocking (4 JavaScript and 2 CSS).	60
Description: The critical rendering path is what the browser needs to do to start rendering the page. Every file requested inside of the head element will postpone the rendering of the page, because the browser need to do the request. Avoid loading JavaScript synchronously inside of the head (you should not need JavaScript to render the page), request files from the same domain as the main document (to avoid DNS lookups) and inline CSS for really fast rendering and a short rendering path.
Offenders: https://static-basket-01.wbbasket.ru/vol0/j/app.min.ad19a657450fb2cc.js https://static-basket-01.wbbasket.ru/vol0/j/spa/index.min.825a12fd0353784f.js https://static-basket-01.wbbasket.ru/vol0/r/js-templates-ru-ru.10.0.42.3.js https://static-basket-01.wbbasket.ru/vol0/r/route-data-ru.10.0.42.3.js
Don't scale images in the browser (avoidScalingImages)	The page has 16 images that are scaled more than 100 pixels. It would be better if those images are sent so the browser don't need to scale them.	0
Description: It's easy to scale images in the browser and make sure they look good in different devices, however that is bad for performance! Scaling images in the browser takes extra CPU time and will hurt performance on mobile. And the user will download extra kilobytes (sometimes megabytes) of data that could be avoided. Don't do that, make sure you create multiple version of the same image server-side and serve the appropriate one.
Offenders: https://basket-02.wbbasket.ru/vol162/part16299/16299735/images/c516x688/1.webp https://basket-12.wbbasket.ru/vol1837/part183755/183755783/images/c516x688/1.webp https://basket-11.wbbasket.ru/vol1626/part162687/162687649/images/c516x688/1.webp https://basket-02.wbbasket.ru/vol145/part14596/14596500/images/c516x688/1.webp https://basket-14.wbbasket.ru/vol2138/part213856/213856145/images/c516x688/1.webp https://basket-11.wbbasket.ru/vol1615/part161549/161549023/images/c516x688/1.webp https://basket-12.wbbasket.ru/vol1834/part183456/183456569/images/c516x688/1.webp https://basket-01.wbbasket.ru/vol28/part2800/2800978/images/c516x688/1.webp https://basket-09.wbbasket.ru/vol1172/part117232/117232736/images/c516x688/1.webp https://basket-02.wbbasket.ru/vol145/part14596/14596520/images/c516x688/1.webp https://basket-12.wbbasket.ru/vol1739/part173980/173980575/images/c516x688/1.webp https://basket-09.wbbasket.ru/vol1172/part117232/117232739/images/c516x688/1.webp https://basket-01.wbbasket.ru/vol35/part3581/3581807/images/c516x688/1.webp https://basket-11.wbbasket.ru/vol1626/part162687/162687645/images/c516x688/1.webp https://basket-01.wbbasket.ru/vol38/part3833/3833409/images/c516x688/1.webp https://static-basket-01.wbbasket.ru/vol1/crm-bnrs/adsf/1727780954362122959.jpg
Have a fast first contentful paint (firstContentfulPaint)	First contentful paint can be improved (2.787 s). It is in the Google Web Vitals needs improvement range, slower than 1.8 seconds.	50
Description: The First Contentful Paint (FCP) metric measures the time from when the page starts loading to when any part of the page content is rendered on the screen. For this metric, "content" refers to text, images (including background images), <svg> elements, or non-white <canvas> elements.
Inline CSS for faster first render (inlineCss)	The page has both inline CSS and CSS requests even though it uses a HTTP/2-ish connection. If you have many users on slow connections, it can be better to only inline the CSS. Run your own tests and check the waterfall graph to see what happens.	95
Description: In the early days of the Internet, inlining CSS was one of the ugliest things you can do. That has changed if you want your page to start rendering fast for your user. Always inline the critical CSS when you use HTTP/1 and HTTP/2 (avoid doing CSS requests that block rendering) and lazy load and cache the rest of the CSS. It is a little more complicated when using HTTP/2. Does your server support HTTP push? Then maybe that can help. Do you have a lot of users on a slow connection and are serving large chunks of HTML? Then it could be better to use the inline technique, becasue some servers always prioritize HTML content over CSS so the user needs to download the HTML first, before the CSS is downloaded.
Have a fast largest contentful paint (largestContentfulPaint)	Largest contentful paint is poor 10.454 s. It is in the Google Web Vitals poor range, slower than 4.5 seconds. You can add fetchPriority="high" to the image to increase the load priority in Chrome.	0
Description: Largest contentful paint is one of Google Web Vitals and reports the render time of the largest image or text block visible within the viewport, relative to when the page first started loading. To be fast according to Google, it needs to render before 2.5 seconds and results over 4 seconds is poor performance.
Offenders: https://basket-02.wbbasket.ru/vol162/part16299/16299735/images/c516x688/1.webp
Avoid CPU Long Tasks (longTasks)	The page has 6 CPU long tasks with the total of 1.064 s. The total blocking time is 743 ms and 1 long task before first contentful paint with total time of 71 ms. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. Use Geckoprofiler for Firefox or Chromes tracelog to debug your long tasks.	0
Description: Long CPU tasks locks the thread. To the user this is commonly visible as a "locked up" page where the browser is unable to respond to user input; this is a major source of bad user experience on the web today. However the CPU Long Task is depending on the computer/phones actual CPU speed, so you should measure this on the same type of the device that your user is using. To debug you should use the Chrome timeline log and drag/drop it into devtools or use Firefox Geckoprofiler.
Offenders: unknown self self self self self
Avoid Frontend single point of failures (spof)	The page has 2 requests inside of the head that can cause a SPOF (single point of failure). Load them asynchronously or move them outside of the document head.	90
Description: A page can be stopped from loading in the browser if a single JavaScript, CSS, and in some cases a font, couldn't be fetched or is loading really slowly (the white screen of death). That is a scenario you really want to avoid. Never load 3rd-party components synchronously inside of the head tag.
Offenders: https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/main-v3.min.bd54797f203b9042.css https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/common.min.3ae7c63f4268e263.css
Avoid extra requests by setting cache headers (cacheHeaders)	The page has 64 requests that are missing a cache time. Configure a cache time so the browser doesn't need to download them every time. It will save 1.2 MB the next access.	0
Description: The easiest way to make your page fast is to avoid doing requests to the server. Setting a cache header on your server response will tell the browser that it doesn't need to download the asset again during the configured cache time! Always try to set a cache time if the content doesn't change for every request.
Offenders: https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/main-v3.min.bd54797f203b9042.css https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/common.min.3ae7c63f4268e263.css https://static-basket-01.wbbasket.ru/vol0/i/v3/header/wb-logo_wb-birthday_2024_2.webp https://static-basket-01.wbbasket.ru/vol0/i/v3/apps/qr-apps.svg https://static-basket-01.wbbasket.ru/vol0/j/app.min.ad19a657450fb2cc.js https://static-basket-01.wbbasket.ru/vol0/j/spa/index.min.825a12fd0353784f.js https://static-basket-01.wbbasket.ru/vol0/r/js-templates-ru-ru.10.0.42.3.js https://static-basket-01.wbbasket.ru/vol0/r/route-data-ru.10.0.42.3.js https://static-basket-01.wbbasket.ru/vol0/i/v3/header/background_wb-birthday_2024.webp https://static-basket-01.wbbasket.ru/vol0/data/promotion-creatives.json.hash https://static-basket-01.wb.ru/vol1/global-payment/default-payment.json https://static-basket-01.wbbasket.ru/vol0/j/spa/services/orderService.min.1ae4b06e459a9146.js https://static-basket-01.wbbasket.ru/vol0/data/cargo-delivery-stores-v2.json https://static-basket-01.wbbasket.ru/vol0/data/stores-data.json https://static-basket-01.wbbasket.ru/vol0/t/jst/spacatalog-ru-ru.4a58fa0073746103.json https://static-basket-01.wbbasket.ru/vol0/data/main-menu-ru-ru-v3.json https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/catalog-pag...c0778a54e724c.css https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/promotion-c...75eab0813cb5c.css https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/promotion-m...38ee7602792fa.css https://user-geo-data.wildberries.ru/get-geo-info...s.ru/get-geo-info https://static-basket-01.wbbasket.ru/vol0/data/promotion-creatives.json https://static-basket-01.wbbasket.ru/vol0/j/spa/services/wbxOrderService.min.a49817e336a3df91.js https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/banners.min.fa5c594041669961.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/searchInput/suggestionsH...1f418cdf2364df.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog/xCatalogData.min.fd5c570d7a53a5ea.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog/queryHelper.min.4a19010826e8d00e.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/providers/xCa...24127e470ebfcd.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog/sorterModel/sort...bdf2a551380b02.js https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/spa.recentItems.min.ef1499c48738a2a7.js https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/spa.tooltip.min.427c93e1900719eb.js https://static-basket-01.wbbasket.ru/vol0/j/spa/models/categoryCatalog.min.7a810ff85be1f0ac.js https://static-basket-01.wbbasket.ru/vol0/data/menu/catalog/ekspress-dostavka.json https://static-basket-01.wbbasket.ru/vol0/t/jst/menutoptmpl-ru-ru.d7da992fc1c000da.json https://banners-website.wildberries.ru/public/v1/banners...public/v1/banners https://static-basket-01.wbbasket.ru/vol0/data/menu/catalog/ekspress-dostavka.json https://catalog.wb.ru/catalog/jewellery1/v2/catalog...llery1/v2/catalog https://catalog.wb.ru/catalog/jewellery1/v2/catalog...llery1/v2/catalog https://static-basket-01.wbbasket.ru/vol0/j/swiper.min.7a55dc87e84f5c3f.js https://static-basket-01.wbbasket.ru/vol1/crm-bnrs/adsf/1727780954362122959.jpg https://static-basket-01.wbbasket.ru/vol0/t/jst/catalogcard-ru-ru.8514a1319a327664.json https://static-basket-01.wbbasket.ru/vol0/t/jst/catalogcore-ru-ru.b3a09120c910d559.json https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/spa.searchTags.min.8e915a967b6c8579.js https://static-basket-01.wbbasket.ru/vol0/t/jst/catalogsitepath-ru-ru.82bb2a30e309e655.json https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/lazyBlockLoader.min.6623456650f0eac0.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/goodsCatalog/...92a5a40c04b2d0.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/shared/catalo...96e69c40b710e9.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/lazyBlockLoader.min.f9571df382b5a066.js https://static-basket-01.wbbasket.ru/vol0/t/jst/recommendationslist-ru-ru.e2fdd963f8a9c93f.json https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/recommendations/recommen...86860f6915047b.js https://catalog.wb.ru/catalog/jewellery1/v6/filters...llery1/v6/filters https://www.wildberries.ru/webapi/spa/catalog/metatags/yuvelirnye-ukrasheniya/ko...krasheniya/koltsa https://static-basket-01.wbbasket.ru/vol0/t/jst/onlinechatpopup-ru-ru.57da630cb64e406d.json https://static-basket-01.wbbasket.ru/vol0/t/jst/filteritem-ru-ru.6be66106ba231687.json https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/onlineChat/onlineChatPop...f03933b9278345.js https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/filtres/filte...a9584b65eb9b5d.js https://static-basket-01.wbbasket.ru/vol0/t/jst/mobilepopupfilter-ru-ru.b0d871a474c04dee.json https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/modules/mobilePopupFil...202312be6f62f.css https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/filtres/mobil...89ba2af34eb709.js https://www.wildberries.ru/manifestv2.json https://www.wildberries.ru/icon.svg https://www.wildberries.ru/favicon.ico https://www.wildberries.ru/android-icon-144x144.png https://static-basket-01.wbbasket.ru/vol0/data/all-poo-v9.json.hash https://static-basket-01.wbbasket.ru/vol0/data/all-poo-fr-v9.json
Long cache headers is good (cacheHeadersLong)	The page has 16 requests that have a shorter cache time than 30 days (but still a cache time).	84
Description: Setting a cache header is good. Setting a long cache header (at least 30 days) is even better beacause then it will stay long in the browser cache. But what do you do if that asset change? Rename it and the browser will pick up the new version.
Offenders: https://a.wb.ru/sdk/sdk.js https://basket-02.wbbasket.ru/vol145/part14596/14596500/images/c516x688/1.webp https://basket-02.wbbasket.ru/vol162/part16299/16299735/images/c516x688/1.webp https://basket-12.wbbasket.ru/vol1837/part183755/183755783/images/c516x688/1.webp https://basket-11.wbbasket.ru/vol1626/part162687/162687649/images/c516x688/1.webp https://basket-14.wbbasket.ru/vol2138/part213856/213856145/images/c516x688/1.webp https://basket-11.wbbasket.ru/vol1615/part161549/161549023/images/c516x688/1.webp https://basket-12.wbbasket.ru/vol1834/part183456/183456569/images/c516x688/1.webp https://basket-01.wbbasket.ru/vol28/part2800/2800978/images/c516x688/1.webp https://basket-09.wbbasket.ru/vol1172/part117232/117232736/images/c516x688/1.webp https://basket-02.wbbasket.ru/vol145/part14596/14596520/images/c516x688/1.webp https://basket-12.wbbasket.ru/vol1739/part173980/173980575/images/c516x688/1.webp https://basket-09.wbbasket.ru/vol1172/part117232/117232739/images/c516x688/1.webp https://basket-01.wbbasket.ru/vol35/part3581/3581807/images/c516x688/1.webp https://basket-11.wbbasket.ru/vol1626/part162687/162687645/images/c516x688/1.webp https://basket-01.wbbasket.ru/vol38/part3833/3833409/images/c516x688/1.webp
Total CSS size shouldn't be too big (cssSize)	The total CSS transfer size is 195.6 kB and uncompressed size is 959.9 kB. That is big and the CSS could most probably be smaller.	0
Description: Delivering a massive amount of CSS to the browser is not the best thing you can do, because it means more work for the browser when parsing the CSS against the HTML and that makes the rendering slower. Try to send only the CSS that is used on that page. And make sure to remove CSS rules when they aren't used anymore.
Offenders: URL Transfer size Content size https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/main-v3.min.bd54797f203b9042.css 53.1 KB 258.4 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/common.min.3ae7c63f4268e263.css 110.9 KB 480.1 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/catalog-pag...c0778a54e724c.css 17.0 KB 125.6 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/promotion-c...75eab0813cb5c.css 6.9 KB 60.0 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/promotion-m...38ee7602792fa.css 2.3 KB 10.2 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/modules/mobilePopupFil...202312be6f62f.css 888 B 3.0 KB
The favicon should be small and cacheable (favicon)	The favicon size is 16 kB bytes. That's quite big, can you make it smaller? The favicon has no cache time.	0
Description: It is easy to make the favicon big but please avoid doing that, because every browser will then perform an unnecessarily large download. And make sure the cache headers are set for a long time for the favicon. It is easy to miss since it's another content type.
Offenders: https://www.wildberries.ru/favicon.ico
Total image size shouldn't be too big (imageSize)	The page total image size is 709.1 kB. It's really big. Is the page using the right format for the images? Can they be lazy loaded? Are they compressed as good as they can be? Make them smaller by using https://imageoptim.com/.	50
Description: Avoid having too many large images on the page. The images will not affect the first paint of the page, but it will eat bandwidth for the user.
Total JavaScript size shouldn't be too big (javascriptSize)	The total JavaScript transfer size is 310.7 kB and the uncompressed size is 1.2 MB. This is totally crazy! There is really room for improvement here.	0
Description: A lot of JavaScript often means you are downloading more than you need. How complex is the page and what can the user do on the page? Do you use multiple JavaScript frameworks?
Offenders: URL Transfer size Content size https://static-basket-01.wbbasket.ru/vol0/j/app.min.ad19a657450fb2cc.js 42.2 KB 108.9 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/index.min.825a12fd0353784f.js 121.8 KB 492.3 KB https://static-basket-01.wbbasket.ru/vol0/r/js-templates-ru-ru.10.0.42.3.js 1.8 KB 5.7 KB https://static-basket-01.wbbasket.ru/vol0/r/route-data-ru.10.0.42.3.js 17.8 KB 109.6 KB https://a.wb.ru/sdk/sdk.js 2.1 KB 5.8 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/services/orderService.min.1ae4b06e459a9146.js 8.7 KB 26.0 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/services/wbxOrderService.min.a49817e336a3df91.js 11.4 KB 36.0 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/banners.min.fa5c594041669961.js 4.0 KB 15.4 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/searchInput/suggestionsH...1f418cdf2364df.js 2.1 KB 5.3 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog/xCatalogData.min.fd5c570d7a53a5ea.js 1.3 KB 4.8 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog/queryHelper.min.4a19010826e8d00e.js 1.3 KB 3.5 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/providers/xCa...24127e470ebfcd.js 2.3 KB 7.1 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog/sorterModel/sort...bdf2a551380b02.js 2.1 KB 6.8 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/spa.recentItems.min.ef1499c48738a2a7.js 669 B 986 B https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/spa.tooltip.min.427c93e1900719eb.js 2.3 KB 8.0 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/models/categoryCatalog.min.7a810ff85be1f0ac.js 4.3 KB 15.1 KB https://static-basket-01.wbbasket.ru/vol0/j/swiper.min.7a55dc87e84f5c3f.js 26.7 KB 103.4 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/spa.searchTags.min.8e915a967b6c8579.js 525 B 745 B https://static-basket-01.wbbasket.ru/vol0/j/spa/customTags/lazyBlockLoader.min.6623456650f0eac0.js 500 B 801 B https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/goodsCatalog/...92a5a40c04b2d0.js 20.2 KB 95.1 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/shared/catalo...96e69c40b710e9.js 865 B 1.7 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/lazyBlockLoader.min.f9571df382b5a066.js 945 B 2.1 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/recommendations/recommen...86860f6915047b.js 9.0 KB 35.1 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/onlineChat/onlineChatPop...f03933b9278345.js 12.4 KB 39.8 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/filtres/filte...a9584b65eb9b5d.js 5.9 KB 25.1 KB https://static-basket-01.wbbasket.ru/vol0/j/spa/modules/catalog_v2/filtres/mobil...89ba2af34eb709.js 514 B 689 B
Avoid using incorrect mime types (mimeTypes)	The page has 1 misconfigured mime type.	99
Description: It's not a great idea to let browsers guess content types (content sniffing), in some cases it can actually be a security risk.
Offenders: https://www.wildberries.ru/webapi/stats/events
Make each CSS response small (optimalCssSize)	https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/main-v3.min.bd54797f203b9042.css size is 54.3 kB (54326) and that is bigger than the limit of 14.5 kB. https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/common.min.3ae7c63f4268e263.css size is 113.6 kB (113596) and that is bigger than the limit of 14.5 kB. https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/catalog-page-v3.min.bdfc0778a54e724c.css size is 17.4 kB (17443) and that is bigger than the limit of 14.5 kB. Try to make the CSS files fit into 14.5 KB.	70
Description: Make CSS responses small to fit into the magic number TCP window size of 14.5 KB. The browser can then download the CSS faster and that will make the page start rendering earlier.
Offenders: URL Transfer size Content size https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/main-v3.min.bd54797f203b9042.css 53.1 KB 258.4 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/spa/common.min.3ae7c63f4268e263.css 110.9 KB 480.1 KB https://static-basket-01.wbbasket.ru/vol0/s/desktop/style/views/site/catalog-pag...c0778a54e724c.css 17.0 KB 125.6 KB
Don't use private headers on static content (privateAssets)	The page has 5 requests with private headers. The main page has a private header. It could be right in some cases where the user can be logged in and served specific content. But if your asset is static it should never be private. Make sure that the assets really should be private and only used by one user. Otherwise, make it cacheable for everyone.	60
Description: If you set private headers on content, that means that the content are specific for that user. Static content should be able to be cached and used by everyone. Avoid setting the cache header to private.
Offenders: https://www.wildberries.ru/catalog/yuvelirnye-ukrasheniya/koltsa?sort=popular&page=1&fbrand=4603 https://www.wildberries.ru/webapi/spa/catalog/metatags/yuvelirnye-ukrasheniya/ko...krasheniya/koltsa https://www.wildberries.ru/manifestv2.json https://www.wildberries.ru/icon.svg https://www.wildberries.ru/android-icon-144x144.png

Best practice advice (70)

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Title	Advice	Score
Cumulative Layout Shift (cumulativeLayoutShift)	You have a cumulative layout shift score (0.1332) that needs improvements. It is in the Google Web Vitals needs improvement range, shift higher than 0.1. You should manually check the filmstrip or video and check if it will affect the user.	50
Description: Cumulative Layout Shift measures the sum total of all individual layout shift scores for unexpected layout shift that occur. The metric is measuring visual stability by quantify how often users experience unexpected layout shifts. It is one of Google Web Vitals.
Meta description (metaDescription)	The meta description is too long. It has 162 characters, the recommended max is 155	50
Description: Use a page description to make the page more relevant to search engines.
Have a good URL format (url)	The page is using more than two request parameters. You should really rethink and try to minimize the number of parameters.	50
Description: A clean URL is good for the user and for SEO. Make them human readable, avoid too long URLs, spaces in the URL, too many request parameters, and never ever have the session id in your URL.
Avoid too many third party requests (thirdParty)	The page do more requests to third party domains (107 requests and 1.5 MB) then first party (11 requests and 61.7 kB). The page transfer more bytes from third party domains (1.5 MB) then first party (61.7 kB). The regex .*wildberries.* was used to calculate first/third party requests.	0
Description: Do not load most of your content from third party URLs.
Avoid unnecessary headers (unnecessaryHeaders)	There are 10 responses that sets both a max-age and expires header. There are 9 responses that sets a pragma no-cache header (that is a request header). There are 49 responses that sets a server header.	32
Description: Do not send headers that you don't need. We look for p3p, cache-control and max-age, pragma, server and x-frame-options headers. Have a look at Andrew Betts - Headers for Hackers talk as a guide https://www.youtube.com/watch?v=k92ZbrY815c or read https://www.fastly.com/blog/headers-we-dont-want.
Offenders: https://www.wildberries.ru/catalog/yuvelirnye-ukrasheniya/koltsa?sort=popular&page=1&fbrand=4603 https://www.wildberries.ru/catalog/yuvelirnye-ukrasheniya/koltsa?sort=popular&page=1&fbrand=4603 https://www.wildberries.ru/catalog/yuvelirnye-ukrasheniya/koltsa?sort=popular&page=1&fbrand=4603 https://a.wb.ru/sdk/sdk.js https://a.wb.ru/sdk/sdk.js https://www.wildberries.ru/webapi/stats/pageview https://www.wildberries.ru/webapi/stats/pageview https://www.wildberries.ru/webapi/stats/pageview https://user-geo-data.wildberries.ru/get-geo-info...s.ru/get-geo-info https://a.wb.ru/e/user_id...a.wb.ru/e/user_id https://a.wb.ru/e/session_start...u/e/session_start https://a.wb.ru/e/pageview....wb.ru/e/pageview https://www.wildberries.ru/webapi/stats/pageview https://www.wildberries.ru/webapi/stats/pageview https://www.wildberries.ru/webapi/stats/pageview https://banners-website.wildberries.ru/public/v1/banners...public/v1/banners https://catalog.wb.ru/catalog/jewellery1/v2/catalog...llery1/v2/catalog https://catalog.wb.ru/catalog/jewellery1/v2/catalog...llery1/v2/catalog https://a.wb.ru/e/pageview....wb.ru/e/pageview https://a.wb.ru/e/Footer_S....wb.ru/e/Footer_S https://catalog.wb.ru/catalog/jewellery1/v6/filters...llery1/v6/filters https://www.wildberries.ru/webapi/spa/catalog/metatags/yuvelirnye-ukrasheniya/ko...krasheniya/koltsa https://www.wildberries.ru/webapi/spa/catalog/metatags/yuvelirnye-ukrasheniya/ko...krasheniya/koltsa https://www.wildberries.ru/webapi/spa/catalog/metatags/yuvelirnye-ukrasheniya/ko...krasheniya/koltsa https://www.wildberries.ru/webapi/stats/events https://www.wildberries.ru/webapi/stats/events https://www.wildberries.ru/webapi/stats/events https://a.wb.ru/e/Screen_V....wb.ru/e/Screen_V https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://www.wildberries.ru/manifestv2.json https://www.wildberries.ru/manifestv2.json https://www.wildberries.ru/manifestv2.json https://www.wildberries.ru/icon.svg https://www.wildberries.ru/icon.svg https://www.wildberries.ru/icon.svg https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://www.wildberries.ru/favicon.ico https://www.wildberries.ru/favicon.ico https://www.wildberries.ru/favicon.ico https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_D....wb.ru/e/Filter_D https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://www.wildberries.ru/android-icon-144x144.png https://www.wildberries.ru/android-icon-144x144.png https://www.wildberries.ru/android-icon-144x144.png https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/Filter_S....wb.ru/e/Filter_S https://a.wb.ru/e/ec...ps://a.wb.ru/e/ec https://a.wb.ru/e/ec...ps://a.wb.ru/e/ec https://a.wb.ru/e/ec...ps://a.wb.ru/e/ec

Privacy advice (93)

Show/hide details

Title	Advice	Score
Set a referrer-policy header to make sure you do not leak user information. (referrerPolicyHeader)	Set a referrer-policy header to make sure you do not leak user information.	0
Description: Referrer Policy is a new header that allows a site to control how much information the browser includes with navigations away from a document and should be set by all sites. https://scotthelme.co.uk/a-new-security-header-referrer-policy/.
Offenders: https://www.wildberries.ru/catalog/yuvelirnye-ukrasheniya/koltsa?sort=popular&page=1&fbrand=4603
Set a strict transport header to make sure the user always use HTTPS. (strictTransportSecurityHeader)	A strict transport header is set but miss out on setting includeSubDomains	90
Description: The HTTP Strict-Transport-Security response header (often abbreviated as HSTS) lets a web site tell browsers that it should only be accessed using HTTPS, instead of using HTTP. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security.

Page info

Page info
Title	Купить ювелирные кольца в интернет магазине WildBerries.ru
Width	485
Height	4465
DOM elements	2766
Avg DOM depth	15
Max DOM depth	19
Iframes	0
Script tags	1490
Local storage	3.8 KB
Session storage	439 B
Network Information API	3g

Resource Hints
preconnect
https://static-basket-01.wbbasket.ru/
https://splitter.wb.ru/
https://photos.wbstatic.net/
https://wb.ru/

Technologies used to build the page.

Data collected using Wappalyzerversion 6.10.66.  Use --browsertime.firefox.includeResponseBodies htmlor --browsertime.chrome.includeResponseBodies htmlto help Wappalyser find more information about technologies used.

Technology	Confidence	Category
Nginx 1.24.0	100	Web servers Reverse proxies
HSTS	100	Security
HTTP/3	100	Miscellaneous

Data from run 2

Visual Metrics

Browser Metrics

Largest Contentful Paint

When in time the page main content is rendered (collected using the Largest Contentful Paint API). Read more about Largest Contentful Paint.

Element type	IMG
Element/tag	<img class="j-thumbnail" width="516" height="688" src="https://basket-02.wbbasket.ru/vol162/part16299/16299735/images/c516x688/1.webp" alt="Кольцо золотое 585 пробы с агатом ювелирное SOKOLOV">
Render time	10.693 s
Elements that needed recalculate style before LCP	3674
Time spent in recalculate style before LCP	175.802 ms
Load time	10.685 s
URL	https://basket-02.wb...s/c516x688/1.webp
Size (width*height)	66006
DOM path
div:eq(0) > main#body-layout > div#mainContainer > div#app > div:eq(1) > div#catalog > div:eq(3) > div:eq(0) > div:eq(0) > div > article#c16299735 > div > div:eq(0) > div:eq(1) > img> div:eq(0) > main#body-layout > div#mainContainer > div#app > div:eq(1) > div#catalog > div:eq(3) > div:eq(0) > div:eq(0) > div > article#c16299735 > div > div:eq(0) > div:eq(1) > img>

The largest contentful paint is highlighted in the image. If no element is highlighted the element was removed before the screenshot or the LCP API couldn't find the element.

The Largest Contentful Paint API highlighted this image as a part of the LCP.

Detected Cumulative Layout Shift

0.13320 cumulative layout shift collected from the Cumulative Layout Shift API.

These HTML elements contribute most to the Cumulative Layout Shifts of the page. The higher score, the more layout shift.

Score	HTML Element
0.13320	<button class="sorter-mobile__btn" data-link="{on showMobileSorter}text{:sorterModel.sorterModel.textValue}" type="button" data-jsv="#96^/96^"></button>,<div class="catalog-page__main new-size" data-link="{include goodsList tmpl=goodsList.template}class{merge: sizerModel.currentCardSize == 1 toggle='catalog-big-card'}"></div>,<::after></::after>,<::after></::after>
body > div:eq(0) > main#body-layout > div#mainContainer > div#app > div:eq(1) > div#catalog > div:eq(2) > div#MTNjMjI0ZWItYTJkMS1jNzFhLTRiYWEtY2QzMjE5Zjg5MGVh > div > div > div > div:eq(1) > div > button:eq(1),body > div:eq(0) > main#body-layout > div#mainContainer > div#app > div:eq(1) > div#catalog > div:eq(3),body > div:eq(0) > main#body-layout > div#mainContainer > div#app > div:eq(1) > div#catalog > div:eq(3) > div:eq(0) > div:eq(0) > div > article#c16299735 > div > div:eq(2) > p > ::after,body > div:eq(0) > main#body-layout > div#mainContainer > div#app > div:eq(1) > div#catalog > div:eq(3) > div:eq(0) > div:eq(0) > div > article#c183755783 > div > div:eq(2) > p > ::after

The elements that have shifted place is highlighted in the image (that have a higher value than 0.01). If the element shifted outside of the viewport, you will not see it there. It can be hard to understand what content that has shifted, if that's the case, checkout the video or the filmstrip of the run.

Long Animation Frames

Read more about the Long Animation Frames API here here.

The top 10 longest animation frames entries

Server timings

There are no Server Timings.

Custom metrics collected through JavaScript

There are no custom configured scripts.

Extra metrics collected using scripting

There are no custom extra metrics from scripting.

PageXray

How the page is built.

Largest assets on the page (by transfer size)

Requests and sizes per content type

Data per domain

Expires and last modified statistics

Requests loaded after onLoad event

Included requests done after load event end.

Requests loaded after onContentLoad

Includes requests done after DOM content loaded.

Render blocking requests

Render blocking information directly from Chrome.

Render information

CPU

Download the Chrome trace log and drag and drop it into Developer Tools / Performance in Chrome.

Long Tasks

Collected using the Long Task API. A long task is a task that take 50 milliseconds or more.

CPU last long task happened at 9.434 s

Individual Long Tasks

CPU time spent

Calculated using Tracium.

Time spent per request

CPU time spent

Third party

Third party requests categorised by Third party web version 0.24.0.

Unmatched third party domains

Here's a list of domains that didn't match any tool in Third party web. If you are sure they are third party domains, please do a PR to that project. You can also fine tune the list using --firstParty.

First party requests and sizes per content type

Calculated using .*wildberries.* (use --firstParty to configure).

Third party requests and sizes per content type

Axe

Axe is an accessibility testing engine for websites and other HTML-based user interfaces. Tested using axe-core version 4.10.0. Read more about axe-core .

Violations

Median number of violations for all the runs. Check each individual run to see all the violations.