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.
1.58 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.82 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
491 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.007
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.40 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.
8.47 s
Page Load Progression
695 ms
1.4 s 2.1 s 2.8 s
3.5 s
4.2 s
4.9 s
5.6 sFPage Weight BudgetAction5.7 MB transferred, 370 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 ImpactAction99% third-party, 0 ms blockingFIX
DJS Execution CostAction3125ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://st-ok.cdn-vk.ru/res/js/require-2.1.11_kyyqpj4q.js | 1007ms | 959ms | 1ms | 3rd |
| Unattributable | 518ms | 55ms | 0ms | 3rd |
| https://ok.ru/ | 284ms | 32ms | 13ms | 1st |
| https://st-ok.cdn-vk.ru/res/js/FrameRateLogger_ntfq6pmy.js | 254ms | 74ms | 0ms | 3rd |
| https://privacy-cs.mail.ru/static/sync-loader.js | 164ms | 135ms | 3ms | 3rd |
| https://st-ok.cdn-vk.ru/res/react/vendor/@vkontakte_icons-2.169.0-amd.js | 151ms | 1ms | 150ms | 3rd |
| https://yandex.ru/ads/system/context.js | 137ms | 105ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-GEGXS3ELM6&cx=c>m=4e64f0 | 119ms | 93ms | 24ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WFHQQ63 | 108ms | 91ms | 15ms | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 92ms | 78ms | 10ms | 3rd |
Showing top 10 of 14 scripts
FJS BundlesAction284 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/1304600/24ec1381af6bc52b.js | 130 KB | 103 KB (80%) | ✓ | 3rd |
| https://st-ok.cdn-vk.ru/res/react/auth-login_vkid-form-adapter_efe77212.js | 155 KB | 83 KB (54%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-GEGXS3ELM6&cx=c>m=4e64f0 | 173 KB | 65 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WFHQQ63 | 130 KB | 62 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 InventoryAction370 resources · 5.7 MB · 1.7 MB savings availableFIX
~1.7 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 370 resources | 5.7 MiB | ||||||
BImage Optimization22 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
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 Waterfall370 requests over 6634msINFO
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 | 1007ms | 0 KB | — | ₽298/mo | Costly |
Unattributable Unattributable | Other | 518ms | 0 KB | — | ₽153/mo | Costly |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 254ms | 2 KB | — | ₽75/mo | Costly |
privacy-cs.mail.ru privacy-cs.mail.ru | Other | 164ms | 22 KB | — | ₽48/mo | Optional |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 151ms | 1149 KB | 5% | ₽45/mo | Optional |
yandex.ru yandex.ru | Other | 137ms | 105 KB | 52% | ₽41/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 119ms | 173 KB | 38% | ₽35/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 108ms | 130 KB | 48% | ₽32/mo | Optional |
mc.yandex.ru mc.yandex.ru | Other | 92ms | 85 KB | 58% | ₽27/mo | Optional |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 81ms | 470 KB | 68% | ₽24/mo | Optional |
st-ok.cdn-vk.ru st-ok.cdn-vk.ru | Other | 78ms | 83 KB | 45% | ₽23/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 67ms | 21 KB | — | ₽20/mo | Optional |
yastatic.net yastatic.net | Other | 65ms | 130 KB | 80% | ₽19/mo | Optional |
These scripts may cost more than they're worth
- st-ok.cdn-vk.ru adds 1007ms and costs ~₽298/month
- Unattributable adds 518ms and costs ~₽153/month
- st-ok.cdn-vk.ru adds 254ms and costs ~₽75/month
91% 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 1007ms 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 518ms 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
st-ok.cdn-vk.ru takes 254ms 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
52% 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
58% 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
80% of yastatic.net'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