Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.97 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.13 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
84 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.008
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.81 s
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
8.71 s
Page Load Progression
882 ms
1.8 s
2.6 s
3.5 s
4.4 s 5.3 s 6.2 s
7.1 sFPage Weight BudgetAction5.7 MB transferred, 355 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction270 scripts, 1.7 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://st-ok.cdn-vk.ru/res/react/vendor/@ok_common_design-system-11.6.0-amd.js | 470 KB | 320 KB (68%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/react/vendor/@vkontakte_vkui-7.1.3-amd.js | 183 KB | 165 KB (91%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/react/components_d1182347.js | 230 KB | 146 KB (64%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/react/vendor/react-router-7.11.0-amd.js | 114 KB | 110 KB (97%) | ✓ | 3rd |
| https://yastatic.net/partner-code-bundles/1304651/00cc0164cd639ddf.js | 130 KB | 103 KB (80%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/react/auth-login_vkid-form-adapter_19d120b4.js | 155 KB | 81 KB (53%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-GEGXS3ELM6&cx=c>m=4e64k0 | 173 KB | 65 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WFHQQ63 | 130 KB | 63 KB (48%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/js/jquery-1.8.3_65hpifcf.js | 0 KB | 61 KB (67%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/js/jquery-1.8.3_65hpifcf.js | 39 KB | 61 KB (67%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
Consider code splitting or tree shaking to reduce unused code.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction355 resources · 5.7 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 355 resources | 5.7 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization21 images, 0 KB saveableREVIEW
CJS Execution CostAction1456ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://st-ok.cdn-vk.ru/res/js/require-2.1.11_kyyqpj4q.js | 451ms | 430ms | 0ms | 3rd |
| Unattributable | 271ms | 46ms | 0ms | 3rd |
| https://st-ok.cdn-vk.ru/res/js/FrameRateLogger_ntfq6pmy.js | 116ms | 33ms | 0ms | 3rd |
| https://ok.ru/ | 114ms | 13ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-GEGXS3ELM6&cx=c>m=4e64k0 | 82ms | 66ms | 16ms | 3rd |
| https://ad.mail.ru/static/sync-loader.js?v=2 | 80ms | 65ms | 2ms | 3rd |
| https://st-ok.cdn-vk.ru/res/react/vendor/@vkontakte_icons-2.169.0-amd.js | 66ms | 0ms | 66ms | 3rd |
| https://yandex.ru/ads/system/context.js | 59ms | 45ms | 7ms | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 59ms | 52ms | 5ms | 3rd |
| https://st-ok.cdn-vk.ru/res/react/vendors_96c0234e.js | 55ms | 40ms | 4ms | 3rd |
Showing top 10 of 12 scripts
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (111 KB)PASS
Web fonts
4
111 KB total
Render-blocking
0
of 4
Dominant font-display
swap
Most common across fonts
Font loading timeline
Optimization checklist
- Preload critical fonts (priority=high)
- Use woff2 format for all fonts
- Set font-display to swap, optional, or fallback
- Subset large fonts (≤100 KB each)
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall355 requests over 6598msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 451ms | 0 KB | — | ₽133/mo | Costly |
Unattributable Unattributable | Other | 271ms | 0 KB | — | ₽80/mo | Costly |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 116ms | 2 KB | — | ₽34/mo | Optional |
ok.ru ok.ru | Other | 114ms | 48 KB | — | ₽34/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 82ms | 173 KB | 38% | ₽24/mo | Optional |
ad.mail.ru ad.mail.ru | Other | 80ms | 22 KB | — | ₽24/mo | Optional |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 66ms | 1149 KB | 5% | ₽20/mo | Optional |
yandex.ru yandex.ru | Other | 59ms | 105 KB | 53% | ₽18/mo | Optional |
mc.yandex.ru mc.yandex.ru | Other | 59ms | 90 KB | 56% | ₽18/mo | Optional |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 55ms | 83 KB | 44% | ₽16/mo | Optional |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 52ms | 470 KB | 68% | ₽16/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 130 KB | 48% | ₽15/mo | Optional |
These scripts may cost more than they're worth
- st-ok.cdn-vk.ru adds 451ms and costs ~₽133/month
- Unattributable adds 271ms and costs ~₽80/month
100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.
Learn more ▾ ▴
Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.
Source: web.dev
st-ok.cdn-vk.ru takes 451ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 271ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
53% of yandex.ru's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
56% of mc.yandex.ru's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
68% of st-ok.cdn-vk.ru's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev