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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
62
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.26 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

3.46 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

120 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.26 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.

3.48 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 s
Checks
15
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 108 requests
FIX
3.0 MB transferred, 108 requests
Warning::
Page weighs 12.1 MB (3.0 MB transferred)
Warning::
JavaScript is 2.6 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 2.6 MB
Info::
CSS is 253 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 253 KB
Warning::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.62 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
108 requests
0.62 g CO2 per page load
JavaScript 2.6 MiB 87%
CSS 253.1 KiB 8%
Images 64.2 KiB 2%
Fonts 36.2 KiB 1%
HTML 26.4 KiB 1%
Other 8.8 KiB 0%
Other 2.1 KiB 0%
Other 795 B 0%
Other 445 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

Why this matters

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.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
92% third-party, 0 ms blocking
FIX
92% third-party, 0 ms blocking
Warning::
Third-party code accounts for 92% of page weight (2.7 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
92%
First-party Third-party
F
JS Bundles
Action
53 scripts, 1.6 MB unused
FIX
53 scripts, 1.6 MB unused
Warning::
https://st.vk.com/dist/core_spa/core_spa_vk.cd6c23...: 596 KB unused (71%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://st.vk.com/dist/web/chunks/common.c83b22c9....: 268 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3...: 235 KB unused (94%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://st.vk.com/dist/web/chunks/vkcom-kit-icons....: 89 KB unused (98%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://st.vk.com/dist/web/chunks/vkui.e301c498.js: 85 KB unused (77%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.6 MB
1681 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.js838 KB596 KB (71%)✓3rd
https://st.vk.com/dist/web/chunks/common.c83b22c9.js428 KB268 KB (63%)✓3rd
https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3eb.js249 KB235 KB (94%)✓3rd
https://st.vk.com/dist/web/chunks/vkcom-kit-icons.e2f47124.js91 KB89 KB (98%)✓3rd
https://st.vk.com/dist/web/chunks/vkui.e301c498.js111 KB85 KB (77%)✓3rd
https://st.vk.com/dist/web/chunks/b0cab1c1.async.a239f8e4.js66 KB58 KB (88%)✓3rd
https://st.vk.com/dist/web/chunks/audioplayer-lib.47d399cf.js68 KB54 KB (81%)✓3rd
https://st.vk.com/dist/web/chunks/audio_config_legacy.44bd28ae.js54 KB50 KB (94%)✓3rd
https://st.vk.com/dist/web/chunks/react.bd51212f.js54 KB48 KB (90%)✓3rd
https://st.vk.com/dist/web/chunks/f70c08bb.async.8ae8dfe7.js38 KB37 KB (99%)✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
108 resources · 3.0 MB · 1.6 MB savings available
FIX
108 resources · 3.0 MB · 1.6 MB savings available
Warning::
Page weight 2.0 MB over 1MB target
Got: 3.0 MB Expected: ≤ 1 MB
Info::
~1.6 MB of savings available
Warning::
87 third-party resources (92% of weight)
Info::
3 resources over 200KB
108 resources · 3.0 MiB · 87 third-party 2.0 MiB over 1MB target
JavaScript 87% · 2.6 MiB
CSS 8% · 253.1 KiB
Image 2% · 69.4 KiB
Font 1% · 36.2 KiB
Document 1% · 31.7 KiB
Other 0% · 1.6 KiB

~1.6 MiB of savings available

Remove unused JavaScript: 1.6 MiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://vk.com/al_im.php?act=vkme_landing&ref= is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 64 KB
0 oversized -0 KB
4 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
599ms total JS execution
REVIEW
599ms total JS execution
Info::
https://st.vk.com/dist/core_spa/core_spa_vk.cd6c23...: 249ms CPU time
Info::
https://st.vk.com/dist/web/common_web.3607fba0.js: 184ms CPU time
Info::
https://vk.me/app: 84ms CPU time
Info::
Unattributable: 82ms CPU time
Warning::
Third-party scripts: 515ms (86% of total)

Main Thread Breakdown

Script Evaluation 57% Script Parsing & Compilation 23% Other 11% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.js249ms177ms66ms3rd
https://st.vk.com/dist/web/common_web.3607fba0.js184ms182ms1ms3rd
https://vk.me/app84ms12ms3ms1st
Unattributable82ms2ms0ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (36 KB)
PASS
2 fonts (36 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

36 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 3.3 s LCP 3.5 shttps://st.vk.com/fonts/VKSansDisplayBold.woff2VKSansDisplayBold.woff2 https://st.vk.com/fonts/VKSansDisplayBold.woff2 — 18.3 KiB — 233 ms — font-display: swaphttps://st.vk.com/fonts/VK_Sans_Display_Regular.woff2VK_Sans_Display_Regular... https://st.vk.com/fonts/VK_Sans_Display_Regular.woff2 — 18.0 KiB — 234 ms — font-display: swap
VKSansDisplayBold.woff2 woff2 swap
Size 18 KB
Load time 233 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
VK_Sans_Display_Regular... woff2 swap
Size 18 KB
Load time 234 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
108 requests over 2767ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 3.3 s LCP 3.5 shttps://vk.me// https://vk.me/ — 301 — 287 B — 180 ms — h2https://vk.me/app/app https://vk.me/app — 200 — 26.4 KiB — 186 ms — h2https://vk.me/css/al/common.837ea214.css/css/al/common.837ea214.css https://vk.me/css/al/common.837ea214.css — 200 — 56.1 KiB — 120 ms — h2https://vk.me/css/al/base.8c3900ec.css/css/al/base.8c3900ec.css https://vk.me/css/al/base.8c3900ec.css — 200 — 7.7 KiB — 119 ms — h2https://vk.me/css/al/vkui.ad50b2ae.css/css/al/vkui.ad50b2ae.css https://vk.me/css/al/vkui.ad50b2ae.css — 200 — 47.6 KiB — 124 ms — h2https://vk.me/css/al/fonts_utf.7fa94ada.css/css/al/fonts_utf.7fa94ada.css https://vk.me/css/al/fonts_utf.7fa94ada.css — 200 — 1.5 KiB — 121 ms — h2https://vk.me/css/al/fonts_cnt_async.4881739c.css/css/al/fonts_cnt_async.4881739c.cs... https://vk.me/css/al/fonts_cnt_async.4881739c.css — 200 — 605 B — 121 ms — h2https://vk.com/js/loader_nav21497680114_3.jsvk.com/js/loader_nav21497680114_3.j... https://vk.com/js/loader_nav21497680114_3.js — 200 — 97.7 KiB — 422 ms — h2https://st.vk.com/dist/core_spa/error_monitoring.isolated.a9c04e6f.jsst.vk.com/dist/core_spa/error_monit... https://st.vk.com/dist/core_spa/error_monitoring.isolated.a9c04e6f.js — 200 — 49.6 KiB — 525 ms — h2https://st.vk.com/dist/core_spa/core_spa_vk.57662b0c.cssst.vk.com/dist/core_spa/core_spa_vk... https://st.vk.com/dist/core_spa/core_spa_vk.57662b0c.css — 200 — 26.1 KiB — 363 ms — h2https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.jsst.vk.com/dist/core_spa/core_spa_vk... https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.js — 200 — 838.0 KiB — 586 ms — h2https://st.vk.com/dist/web/chunks/vkcom-kit.d933359f.cssst.vk.com/dist/web/chunks/vkcom-kit... https://st.vk.com/dist/web/chunks/vkcom-kit.d933359f.css — 200 — 81.8 KiB — 360 ms — h2https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3eb.jsst.vk.com/dist/web/chunks/vkcom-kit... https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3eb.js — 200 — 249.4 KiB — 540 ms — h2https://st.vk.com/dist/web/chunks/vkcom-kit-icons.e2f47124.jsst.vk.com/dist/web/chunks/vkcom-kit... https://st.vk.com/dist/web/chunks/vkcom-kit-icons.e2f47124.js — 200 — 91.4 KiB — 409 ms — h2https://st.vk.com/dist/web/chunks/react.bd51212f.jsst.vk.com/dist/web/chunks/react.bd5... https://st.vk.com/dist/web/chunks/react.bd51212f.js — 200 — 54.2 KiB — 411 ms — h2https://st.vk.com/dist/web/chunks/vkui.e301c498.jsst.vk.com/dist/web/chunks/vkui.e301... https://st.vk.com/dist/web/chunks/vkui.e301c498.js — 200 — 110.8 KiB — 477 ms — h2https://st.vk.com/dist/web/chunks/state-management.c8525527.jsst.vk.com/dist/web/chunks/state-man... https://st.vk.com/dist/web/chunks/state-management.c8525527.js — 200 — 24.3 KiB — 415 ms — h2https://st.vk.com/dist/web/chunks/architecture-mobx.b327c653.jsst.vk.com/dist/web/chunks/architect... https://st.vk.com/dist/web/chunks/architecture-mobx.b327c653.js — 200 — 21.0 KiB — 416 ms — h2https://st.vk.com/dist/web/chunks/audioplayer-lib.85ff28d7.cssst.vk.com/dist/web/chunks/audioplay... https://st.vk.com/dist/web/chunks/audioplayer-lib.85ff28d7.css — 200 — 1.4 KiB — 176 ms — h2https://st.vk.com/dist/web/chunks/audioplayer-lib.47d399cf.jsst.vk.com/dist/web/chunks/audioplay... https://st.vk.com/dist/web/chunks/audioplayer-lib.47d399cf.js — 200 — 67.5 KiB — 473 ms — h2https://st.vk.com/dist/web/chunks/common.c83b22c9.jsst.vk.com/dist/web/chunks/common.c8... https://st.vk.com/dist/web/chunks/common.c83b22c9.js — 200 — 428.3 KiB — 542 ms — h2https://st.vk.com/dist/web/chunks/common.evergreen.5045dff3.jsst.vk.com/dist/web/chunks/common.ev... https://st.vk.com/dist/web/chunks/common.evergreen.5045dff3.js — 200 — 29.5 KiB — 467 ms — h2https://st.vk.com/dist/web/common_web.917adb2f.cssst.vk.com/dist/web/common_web.917ad... https://st.vk.com/dist/web/common_web.917adb2f.css — 200 — 967 B — 176 ms — h2https://st.vk.com/dist/web/common_web.3607fba0.jsst.vk.com/dist/web/common_web.3607f... https://st.vk.com/dist/web/common_web.3607fba0.js — 200 — 27.5 KiB — 467 ms — h2https://vk.com/js/lang3_0.jsvk.com/js/lang3_0.js https://vk.com/js/lang3_0.js — 200 — 53.5 KiB — 332 ms — h2https://vk.me/js/lang3_2.js?29614929/js/lang3_2.js?29614929 https://vk.me/js/lang3_2.js?29614929 — 200 — 1.0 KiB — 168 ms — h2https://st.vk.com/css/al/vkme.bbcf8291.cssst.vk.com/css/al/vkme.bbcf8291.css https://st.vk.com/css/al/vkme.bbcf8291.css — 200 — 2.2 KiB — 175 ms — h2https://st.vk.com/dist/web/vkme-desktop.74f5267d.jsst.vk.com/dist/web/vkme-desktop.74f... https://st.vk.com/dist/web/vkme-desktop.74f5267d.js — 200 — 2.5 KiB — 464 ms — h2https://st.vk.com/css/landings/common.c04c9fc0.cssst.vk.com/css/landings/common.c04c9... https://st.vk.com/css/landings/common.c04c9fc0.css — 200 — 1.3 KiB — 176 ms — h2https://st.vk.com/css/landings/landings_vkme.57b962a5.cssst.vk.com/css/landings/landings_vkm... https://st.vk.com/css/landings/landings_vkme.57b962a5.css — 200 — 23.7 KiB — 356 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 3.3 s LCP 3.5 shttps://vk.me// https://vk.me/ — 301 — 287 B — 180 ms — h2https://vk.me/app/app https://vk.me/app — 200 — 26.4 KiB — 186 ms — h2https://vk.me/css/al/common.837ea214.css/css/al/common.837ea214.css https://vk.me/css/al/common.837ea214.css — 200 — 56.1 KiB — 120 ms — h2https://vk.me/css/al/base.8c3900ec.css/css/al/base.8c3900ec.css https://vk.me/css/al/base.8c3900ec.css — 200 — 7.7 KiB — 119 ms — h2https://vk.me/css/al/vkui.ad50b2ae.css/css/al/vkui.ad50b2ae.css https://vk.me/css/al/vkui.ad50b2ae.css — 200 — 47.6 KiB — 124 ms — h2https://vk.me/css/al/fonts_utf.7fa94ada.css/css/al/fonts_utf.7fa94ada.css https://vk.me/css/al/fonts_utf.7fa94ada.css — 200 — 1.5 KiB — 121 ms — h2https://vk.me/css/al/fonts_cnt_async.4881739c.css/css/al/fonts_cnt_async.4881739c.cs... https://vk.me/css/al/fonts_cnt_async.4881739c.css — 200 — 605 B — 121 ms — h2https://vk.com/js/loader_nav21497680114_3.jsvk.com/js/loader_nav21497680114_3.j... https://vk.com/js/loader_nav21497680114_3.js — 200 — 97.7 KiB — 422 ms — h2https://st.vk.com/dist/core_spa/error_monitoring.isolated.a9c04e6f.jsst.vk.com/dist/core_spa/error_monit... https://st.vk.com/dist/core_spa/error_monitoring.isolated.a9c04e6f.js — 200 — 49.6 KiB — 525 ms — h2https://st.vk.com/dist/core_spa/core_spa_vk.57662b0c.cssst.vk.com/dist/core_spa/core_spa_vk... https://st.vk.com/dist/core_spa/core_spa_vk.57662b0c.css — 200 — 26.1 KiB — 363 ms — h2https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.jsst.vk.com/dist/core_spa/core_spa_vk... https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.js — 200 — 838.0 KiB — 586 ms — h2https://st.vk.com/dist/web/chunks/vkcom-kit.d933359f.cssst.vk.com/dist/web/chunks/vkcom-kit... https://st.vk.com/dist/web/chunks/vkcom-kit.d933359f.css — 200 — 81.8 KiB — 360 ms — h2https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3eb.jsst.vk.com/dist/web/chunks/vkcom-kit... https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3eb.js — 200 — 249.4 KiB — 540 ms — h2https://st.vk.com/dist/web/chunks/vkcom-kit-icons.e2f47124.jsst.vk.com/dist/web/chunks/vkcom-kit... https://st.vk.com/dist/web/chunks/vkcom-kit-icons.e2f47124.js — 200 — 91.4 KiB — 409 ms — h2https://st.vk.com/dist/web/chunks/react.bd51212f.jsst.vk.com/dist/web/chunks/react.bd5... https://st.vk.com/dist/web/chunks/react.bd51212f.js — 200 — 54.2 KiB — 411 ms — h2https://st.vk.com/dist/web/chunks/vkui.e301c498.jsst.vk.com/dist/web/chunks/vkui.e301... https://st.vk.com/dist/web/chunks/vkui.e301c498.js — 200 — 110.8 KiB — 477 ms — h2https://st.vk.com/dist/web/chunks/state-management.c8525527.jsst.vk.com/dist/web/chunks/state-man... https://st.vk.com/dist/web/chunks/state-management.c8525527.js — 200 — 24.3 KiB — 415 ms — h2https://st.vk.com/dist/web/chunks/architecture-mobx.b327c653.jsst.vk.com/dist/web/chunks/architect... https://st.vk.com/dist/web/chunks/architecture-mobx.b327c653.js — 200 — 21.0 KiB — 416 ms — 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https://st.vk.com/dist/web/chunks/38e27adb.async.d2ea7031.js — 200 — 9.2 KiB — 60 ms — h2https://st.vk.com/dist/web/chunks/audio_onMediaAttachmentPlayer.94e334a8.jsst.vk.com/dist/web/chunks/audio_onM... https://st.vk.com/dist/web/chunks/audio_onMediaAttachmentPlayer.94e334a8.js — 200 — 3.8 KiB — 61 ms — h2https://st.vk.com/dist/web/chunks/audio_postingPlayer.1b1ebc31.jsst.vk.com/dist/web/chunks/audio_pos... https://st.vk.com/dist/web/chunks/audio_postingPlayer.1b1ebc31.js — 200 — 3.7 KiB — 61 ms — h2https://vk.com/login.php?slogin_h=6a654d15414cf1609b.a3c81764d9444381e3&act=slogin&role=fast&redirect=1&to=aHR0cHM6Ly92ay5jb20vYWxfaW0ucGhwP2FjdD12a21lX2xhbmRpbmcmcmVmPQ--&niuh=1vk.com/login.php?slogin_h=6a654d154... https://vk.com/login.php?slogin_h=6a654d15414cf1609b.a3c81764d9444381e3&act=slogin&role=fast&redirect=1&to=aHR0cHM6Ly92ay5jb20vYWxfaW0ucGhwP2FjdD12a21lX2xhbmRpbmcmcmVmPQ--&niuh=1 — 302 — 1.1 KiB — 83 ms — h2https://vk.com/vk.com/ https://vk.com/ — -1 — 0 B — 349 ms — https://vk.me/images/icons/favicons/fav_logo.ico?8/images/icons/favicons/fav_logo.ico... https://vk.me/images/icons/favicons/fav_logo.ico?8 — 200 — 5.2 KiB — 59 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
86% of JavaScript execution is third-party
First-party Third-party 515ms · 866KB · ₽152/mo
st.vk.com
Other
Costly
Execution 249ms
Transfer 838 KB
Unused 71%
Monthly Cost ₽74/mo
st.vk.com
Other
Costly
Execution 184ms
Transfer 28 KB
Monthly Cost ₽54/mo
Unattributable
Other
Optional
Execution 82ms
Transfer 0 KB
Monthly Cost ₽24/mo

These scripts may cost more than they're worth

  • st.vk.com adds 249ms and costs ~₽74/month
  • st.vk.com adds 184ms and costs ~₽54/month

86% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.vk.com takes 249ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

71% of st.vk.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

st.vk.com takes 184ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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