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.
3.32 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.89 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
74 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.003
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.32 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.
4.79 s
Page Load Progression
375 ms 750 ms
1.1 s 1.5 s 1.9 s 2.2 s
2.6 s
3.0 sFPage Weight BudgetAction3.6 MB transferred, 152 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 ImpactAction93% third-party, 0 ms blockingFIX
FJS BundlesAction78 scripts, 1.8 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://st.vk.ru/dist/core_spa/core_spa_vk.12d6213b.js | 837 KB | 557 KB (67%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/common.0a2fe728.js | 428 KB | 259 KB (61%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/vkcom-kit.4c5691fd.js | 249 KB | 231 KB (93%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/vkcom-kit-icons.c4563565.js | 91 KB | 89 KB (98%) | ✓ | 3rd |
| https://static.vk.ru/vkid/1.1.1321/qr_auth.js | 181 KB | 77 KB (43%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/vkui.e301c498.js | 111 KB | 75 KB (68%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/d716fd59.56eb09e2.js | 72 KB | 58 KB (81%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/b0cab1c1.async.60d15b44.js | 66 KB | 58 KB (88%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/audioplayer-lib.85e44529.js | 68 KB | 50 KB (75%) | ✓ | 3rd |
| https://st.vk.ru/dist/web/chunks/audio_config_legacy.4c3f6b9a.js | 54 KB | 50 KB (94%) | ✓ | 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 InventoryAction152 resources · 3.6 MB · 1.8 MB savings availableFIX
~1.8 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 152 resources | 3.6 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization5 images, 0 KB saveableREVIEW
CJS Execution CostAction1678ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 579ms | 121ms | 0ms | 3rd |
| https://st.vk.ru/dist/web/chunks/common.0a2fe728.js | 298ms | 276ms | 2ms | 3rd |
| https://st.vk.ru/dist/core_spa/core_spa_vk.12d6213b.js | 245ms | 241ms | 3ms | 3rd |
| https://static.vk.ru/vkid/1.1.1321/qr_auth.js | 129ms | 92ms | 14ms | 3rd |
| https://st.vk.ru/dist/web/grip.67dde0b3.js | 116ms | 91ms | 3ms | 3rd |
| https://vk.ru/ | 112ms | 15ms | 5ms | 1st |
| https://st.vk.ru/dist/core_spa/error_monitoring.isolated.a9c04e6f.js | 67ms | 61ms | 0ms | 3rd |
| https://privacy-cs.mail.ru/static/sync-loader.js | 67ms | 58ms | 2ms | 3rd |
| https://vk.ru/dist/core_spa/chunks/grip-lib.d84d2556.js | 64ms | 63ms | 1ms | 1st |
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 Loading6 fonts (140 KB)PASS
Web fonts
6
140 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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)
Fixing the unchecked items could save ~26 KB and ~52 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall152 requests over 6067msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 579ms | 0 KB | — | ₽171/mo | Costly |
st.vk.ru st.vk.ru | Other | 298ms | 428 KB | 61% | ₽88/mo | Costly |
st.vk.ru st.vk.ru | Other | 245ms | 837 KB | 67% | ₽73/mo | Costly |
static.vk.ru static.vk.ru | Other | 129ms | 181 KB | 43% | ₽38/mo | Optional |
st.vk.ru st.vk.ru | Other | 116ms | 9 KB | — | ₽34/mo | Optional |
st.vk.ru st.vk.ru | Other | 67ms | 50 KB | 69% | ₽20/mo | Optional |
privacy-cs.mail.ru privacy-cs.mail.ru | Other | 67ms | 22 KB | — | ₽20/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 579ms and costs ~₽171/month
- st.vk.ru adds 298ms and costs ~₽88/month
- st.vk.ru adds 245ms and costs ~₽73/month
89% 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
Unattributable takes 579ms 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.vk.ru takes 298ms 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
61% of st.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
st.vk.ru takes 245ms 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
67% of st.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
69% of st.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