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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
30
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.

15.80 s

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

21.20 s

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

1.36 s

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.

15.80 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.

21.24 s

Page Load Progression

477 ms
953 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.3 s
3.8 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.0 MB transferred, 105 requests
FIX
3.0 MB transferred, 105 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::
105 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.64 g CO2 per page load
3.0 MB / 2.4 MB budget
3.0 MB transferred
105 requests
0.64 g CO2 per page load
JavaScript 2.6 MiB 85%
CSS 253.1 KiB 8%
Images 144.1 KiB 5%
Fonts 36.3 KiB 1%
HTML 26.4 KiB 1%
Other 9.7 KiB 0%
Other 2.2 KiB 0%
Other 797 B 0%
Other 444 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
90% third-party, 0 ms blocking
FIX
90% third-party, 0 ms blocking
Warning::
Third-party code accounts for 90% of page weight (2.7 MiB of 3.0 MiB)
Info::
Third-party blocking time is low (0 ms)
90%
First-party Third-party
D
JS Execution Cost
Action
3358ms total JS execution
FIX
3358ms total JS execution
Warning::
https://st.vk.com/dist/core_spa/core_spa_vk.cd6c23...: 1203ms CPU time
Warning::
https://st.vk.com/dist/web/common_web.3607fba0.js: 887ms CPU time
Warning::
Unattributable: 356ms CPU time
Info::
https://vk.me/app: 240ms CPU time
Info::
https://st.vk.com/dist/web/chunks/common.c83b22c9....: 167ms CPU time
Warning::
Third-party scripts: 3030ms (90% of total)

Main Thread Breakdown

Script Evaluation 58% Script Parsing & Compilation 24% Other 11% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://st.vk.com/dist/core_spa/core_spa_vk.cd6c2341.js1203ms827ms285ms3rd
https://st.vk.com/dist/web/common_web.3607fba0.js887ms856ms7ms3rd
Unattributable356ms9ms0ms3rd
https://vk.me/app240ms35ms15ms1st
https://st.vk.com/dist/web/chunks/common.c83b22c9.js167ms5ms159ms3rd
https://st.vk.com/dist/core_spa/error_monitoring.isolated.a9c04e6f.js104ms82ms12ms3rd
https://st.vk.com/dist/web/chunks/vkcom-kit.9c3de3eb.js98ms3ms94ms3rd
https://st.vk.com/dist/web/chunks/audio_config_legacy.44bd28ae.js91ms75ms16ms3rd
https://vk.me/js/langs/web/AudioEventNotifier.b82c8ec8afb32860.js?v=1&p=web&l=388ms82ms0ms1st
https://st.vk.com/dist/web/chunks/audio_config_overrides.a993f368.js72ms57ms15ms3rd

Showing top 10 of 11 scripts

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
105 resources · 3.0 MB · 1.6 MB savings available
FIX
105 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::
84 third-party resources (90% of weight)
Info::
3 resources over 200KB
105 resources · 3.0 MiB · 84 third-party 2.0 MiB over 1MB target
JavaScript 85% · 2.6 MiB
CSS 8% · 253.1 KiB
Image 5% · 149.3 KiB
Font 1% · 36.3 KiB
Document 1% · 32.6 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
14 images, 0 KB saveable
REVIEW
14 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.
14 images 144 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 15.8 s LCP 21.2 shttps://st.vk.com/fonts/VKSansDisplayBold.woff2VKSansDisplayBold.woff2 https://st.vk.com/fonts/VKSansDisplayBold.woff2 — 18.3 KiB — 248 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 — 250 ms — font-display: swap
VKSansDisplayBold.woff2 woff2 swap
Size 18 KB
Load time 248 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
VK_Sans_Display_Regular... woff2 swap
Size 18 KB
Load time 250 ms
Start 1.8 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
105 requests over 2960ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 15.8 s LCP 21.2 shttps://vk.me// https://vk.me/ — 301 — 284 B — 180 ms — h2https://vk.me/app/app https://vk.me/app — 200 — 26.4 KiB — 195 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 — 119 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 — 118 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 — 166 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 — 163 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 — 598 B — 164 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 — 431 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 — 451 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 — 291 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 — 642 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 — 419 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 — 587 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 — 525 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 — 528 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 — 587 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 — 577 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 — 577 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 — 416 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 — 587 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 — 598 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 — 588 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 — 416 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 — 580 ms — h2https://vk.com/js/lang3_0.jsvk.com/js/lang3_0.js https://vk.com/js/lang3_0.js — 200 — 53.5 KiB — 431 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 — 164 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 — 415 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 — 577 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 — 415 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 — 416 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s FCP 15.8 s LCP 21.2 shttps://vk.me// https://vk.me/ — 301 — 284 B — 180 ms — h2https://vk.me/app/app https://vk.me/app — 200 — 26.4 KiB — 195 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 — 119 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 — 118 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 — 166 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 — 163 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 — 598 B — 164 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 — 431 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 — 451 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 — 291 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 — 642 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 — 419 ms — 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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 — 59 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 — 60 ms — h2https://vk.com/login.php?slogin_h=6a654d15414cf1609b.6148249b8f8b4de1b7&act=slogin&role=fast&redirect=1&to=aHR0cHM6Ly92ay5jb20vYWxfaW0ucGhwP2FjdD12a21lX2xhbmRpbmcmcmVmPQ--&niuh=1vk.com/login.php?slogin_h=6a654d154... https://vk.com/login.php?slogin_h=6a654d15414cf1609b.6148249b8f8b4de1b7&act=slogin&role=fast&redirect=1&to=aHR0cHM6Ly92ay5jb20vYWxfaW0ucGhwP2FjdD12a21lX2xhbmRpbmcmcmVmPQ--&niuh=1 — 302 — 1.1 KiB — 78 ms — h2https://vk.com/vk.com/ https://vk.com/ — 302 — 932 B — 67 ms — h2https://m.vk.com/m.vk.com/ https://m.vk.com/ — -1 — 0 B — 174 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 — h2https://tns-counter.ru/tns-counter.ru/ https://tns-counter.ru/ — 200 — 181 B — 73 ms — h2https://top-fwz1.mail.ru/top-fwz1.mail.ru/ https://top-fwz1.mail.ru/ — 200 — 578 B — 71 ms — h2https://ads.vk.com/ads.vk.com/ https://ads.vk.com/ — 200 — 300 B — 69 ms — h2https://r0.mradx.net/r0.mradx.net/ https://r0.mradx.net/ — 204 — 40 B — 458 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
90% of JavaScript execution is third-party
First-party Third-party 3030ms · 1723KB · ₽897/mo
st.vk.com
Other
Costly
Execution 1203ms
Transfer 838 KB
Unused 71%
Monthly Cost ₽356/mo
st.vk.com
Other
Costly
Execution 887ms
Transfer 28 KB
Monthly Cost ₽263/mo
Unattributable
Other
Costly
Execution 356ms
Transfer 0 KB
Monthly Cost ₽106/mo
st.vk.com
Other
Optional
Execution 167ms
Transfer 428 KB
Unused 63%
Monthly Cost ₽49/mo
st.vk.com
Other
Optional
Execution 104ms
Transfer 50 KB
Unused 69%
Monthly Cost ₽31/mo
st.vk.com
Other
Optional
Execution 98ms
Transfer 249 KB
Unused 94%
Monthly Cost ₽29/mo
st.vk.com
Other
Optional
Execution 91ms
Transfer 54 KB
Unused 94%
Monthly Cost ₽27/mo
st.vk.com
Other
Optional
Execution 72ms
Transfer 39 KB
Unused 73%
Monthly Cost ₽21/mo
st.vk.com
Other
Optional
Execution 50ms
Transfer 38 KB
Unused 99%
Monthly Cost ₽15/mo

These scripts may cost more than they're worth

  • st.vk.com adds 1203ms and costs ~₽356/month
  • st.vk.com adds 887ms and costs ~₽263/month
  • Unattributable adds 356ms and costs ~₽106/month

90% 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 1203ms 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 887ms 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

Unattributable takes 356ms 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

63% 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

69% 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

94% 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

94% 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

73% 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

99% 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

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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