Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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

Mobile Desktop

Performance

Accessibility

Best Practices

SEO

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

3.96 s

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

4.26 s

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

797 ms

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

0.001

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

3.96 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.

17.22 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

7 PASS 2 REVIEW 6 FIX

Page Weight Budget

Action

2.6 MB transferred, 202 requests

FIX

2.6 MB transferred, 202 requests

Page weighs 10.1 MB (2.6 MB transferred)

JavaScript is 1.5 MB — consider code splitting or lazy loading

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

Got: 1.5 MB

202 HTTP requests — consider bundling or reducing

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Estimated 0.54 g CO2 per page load

2.6 MB transferred

202 requests

0.54 g CO2 per page load

JavaScript 1.5 MiB 56%

Other 625.5 KiB 24%

Images 239.0 KiB 9%

CSS 166.4 KiB 6%

Fonts 105.5 KiB 4%

HTML 13.6 KiB 1%

Other 4.8 KiB 0%

Other 1.8 KiB 0%

Other 721 B 0%

Other 380 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

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

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (2.6 MiB of 2.6 MiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

JS Execution Cost

Action

3796ms total JS execution

FIX

3796ms total JS execution

Unattributable: 1003ms CPU time

https://m.ok.ru/mres/batch/js/common/f0a82b76/comm...: 468ms CPU time

https://privacy-cs.mail.ru/static/sync-loader.js: 371ms CPU time

https://m.ok.ru/mres/batch/js/head/f4d757e/head.js: 293ms CPU time

https://m.ok.ru/mres/react/toast-manager_b464fc79....: 228ms CPU time

Third-party scripts: 3796ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Other 31% Script Parsing & Compilation 21% Style & Layout 3%

Script	Total	Scripting	Parse/Compile	Party
Unattributable	1003ms	15ms	0ms	3rd
https://m.ok.ru/mres/batch/js/common/f0a82b76/common.js	468ms	210ms	86ms	3rd
https://privacy-cs.mail.ru/static/sync-loader.js	371ms	301ms	44ms	3rd
https://m.ok.ru/mres/batch/js/head/f4d757e/head.js	293ms	245ms	9ms	3rd
https://m.ok.ru/mres/react/toast-manager_b464fc79.js	228ms	160ms	62ms	3rd
https://m.ok.ru/mres/react/clips-fullscreen_dedf91f.js	217ms	148ms	69ms	3rd
https://m.ok.ru/mres/batch/js/reacte58fc505/vendors.js	192ms	28ms	163ms	3rd
https://m.ok.ru/mres/batch/js/healthPage/accbaa14/coreKeeper.js	190ms	145ms	2ms	3rd
https://m.ok.ru/	186ms	35ms	9ms	3rd
https://mc.yandex.ru/metrika/tag.js	180ms	152ms	21ms	3rd

Showing top 10 of 15 scripts

JS Bundles

Action

27 scripts, 5.8 MB unused

FIX

27 scripts, 5.8 MB unused

https://m.ok.ru/mres/batch/js/reacte58fc505/vendor...: 1.6 MB unused (94%)

Consider code splitting or tree shaking to reduce unused code.

https://m.ok.ru/mres/batch/js/reacte58fc505/vendor...: 1.6 MB unused (94%)

Consider code splitting or tree shaking to reduce unused code.

https://m.ok.ru/mres/batch/js/reacte58fc505/react-...: 805 KB unused (88%)

Consider code splitting or tree shaking to reduce unused code.

https://m.ok.ru/mres/batch/js/reacte58fc505/react-...: 805 KB unused (88%)

Consider code splitting or tree shaking to reduce unused code.

https://m.ok.ru/mres/batch/js/photos6a361c01/photo...: 212 KB unused (87%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 5.8 MB

5953 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://m.ok.ru/mres/batch/js/reacte58fc505/vendors.js	0 KB	1656 KB (94%)	✓	3rd
https://m.ok.ru/mres/batch/js/reacte58fc505/vendors.js	375 KB	1656 KB (94%)	✓	3rd
https://m.ok.ru/mres/batch/js/reacte58fc505/react-loader.js	231 KB	805 KB (88%)	✓	3rd
https://m.ok.ru/mres/batch/js/reacte58fc505/react-loader.js	0 KB	805 KB (88%)	✓	3rd
https://m.ok.ru/mres/batch/js/photos6a361c01/photos.module.js	244 KB	212 KB (87%)	✓	3rd
https://m.ok.ru/mres/batch/js/registrationf815cd9a/landing.module.js	227 KB	200 KB (88%)	✓	3rd
https://m.ok.ru/mres/batch/js/donate73192632/donate.module.js	227 KB	200 KB (88%)	✓	3rd
https://m.ok.ru/mres/batch/js/common/f0a82b76/common.js	226 KB	161 KB (71%)	✓	3rd
https://m.ok.ru/mres/react/clips-fullscreen_dedf91f.js	179 KB	97 KB (54%)	✓	3rd
https://m.ok.ru/mres/react/toast-manager_b464fc79.js	166 KB	89 KB (54%)	✓	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

Page Weight Inventory

Action

202 resources · 2.6 MB · 5.8 MB savings available

FIX

202 resources · 2.6 MB · 5.8 MB savings available

Page weight 1.6 MB over 1MB target

Got: 2.6 MB Expected: ≤ 1 MB

~5.8 MB of savings available

201 third-party resources (100% of weight)

6 resources over 200KB

202 resources · 2.6 MiB · 201 third-party 1.6 MiB over 1MB target

JavaScript 79% · 2.1 MiB

Image 9% · 247.9 KiB

CSS 6% · 166.4 KiB

Font 4% · 105.5 KiB

Document 1% · 13.6 KiB

Other 0% · 12.6 KiB

~5.8 MiB of savings available

Remove unused JavaScript: 5.8 MiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

202 resources			2.6 MiB

HTTP Caching

Action

No cache headers

FIX

No cache headers

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.

Image Optimization

127 images, 0 KB saveable

REVIEW

127 images, 0 KB saveable

https://m.ok.ru/mres/img/flags/flag_en.png is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

127 images 239 KB

0 oversized -0 KB

126 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

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

All text resources are properly compressed.

A+

Font Loading

3 fonts (105 KB)

PASS

3 fonts (105 KB)

3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

105 KB total

Render-blocking

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

svg-icons.woff woff swap

Size 50 KB

Load time 292 ms

Start 614 ms

Risk FOUT — text flashes from fallback to web font

Convert to woff2 for ~30% smaller file size

Onest-Regular.woff2 woff2 swap

Size 27 KB

Load time 125 ms

Start 968 ms

Risk FOUT — text flashes from fallback to web font

Onest-SemiBold.woff2 woff2 swap

Size 28 KB

Load time 122 ms

Start 969 ms

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)

Fixing the unchecked items could save ~15 KB and ~30 ms

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

64 hints, 0 missing preconnects

PASS

64 hints, 0 missing preconnects

Page uses 64 resource hint(s)

Current Resource Hints

preconnect

preload

dns-prefetch

—

prefetch

+34

64 resource hints configured

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

202 requests over 32126ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 3796ms · 1444KB · ₽1124/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	1003ms	0 KB	—	₽297/mo	Costly
m.ok.ru m.ok.ru	Other	468ms	226 KB	71%	₽139/mo	Costly
privacy-cs.mail.ru privacy-cs.mail.ru	Other	371ms	22 KB	—	₽110/mo	Costly
m.ok.ru m.ok.ru	Other	293ms	24 KB	—	₽87/mo	Costly
m.ok.ru m.ok.ru	Other	228ms	166 KB	54%	₽67/mo	Costly
m.ok.ru m.ok.ru	Other	217ms	179 KB	54%	₽64/mo	Costly
m.ok.ru m.ok.ru	Other	192ms	0 KB	94%	₽57/mo	Costly
m.ok.ru m.ok.ru	Other	190ms	12 KB	—	₽56/mo	Costly
m.ok.ru m.ok.ru	Other	186ms	14 KB	—	₽55/mo	Costly
mc.yandex.ru mc.yandex.ru	Other	180ms	85 KB	59%	₽53/mo	Costly
m.ok.ru m.ok.ru	Other	115ms	244 KB	87%	₽34/mo	Optional
top-fwz1.mail.ru top-fwz1.mail.ru	Other	108ms	20 KB	—	₽32/mo	Optional
m.ok.ru m.ok.ru	Other	91ms	227 KB	88%	₽27/mo	Optional
m.ok.ru m.ok.ru	Other	81ms	227 KB	88%	₽24/mo	Optional
m.ok.ru m.ok.ru	Other	72ms	0 KB	88%	₽21/mo	Optional

Unattributable

Other

Costly

Execution 1003ms

Transfer 0 KB

Monthly Cost ₽297/mo

m.ok.ru

Other

Costly

Execution 468ms

Transfer 226 KB

Unused 71%

Monthly Cost ₽139/mo

privacy-cs.mail.ru

Other

Costly

Execution 371ms

Transfer 22 KB

Monthly Cost ₽110/mo

m.ok.ru

Other

Costly

Execution 293ms

Transfer 24 KB

Monthly Cost ₽87/mo

m.ok.ru

Other

Costly

Execution 228ms

Transfer 166 KB

Unused 54%

Monthly Cost ₽67/mo

m.ok.ru

Other

Costly

Execution 217ms

Transfer 179 KB

Unused 54%

Monthly Cost ₽64/mo

m.ok.ru

Other

Costly

Execution 192ms

Transfer 0 KB

Unused 94%

Monthly Cost ₽57/mo

m.ok.ru

Other

Costly

Execution 190ms

Transfer 12 KB

Monthly Cost ₽56/mo

m.ok.ru

Other

Costly

Execution 186ms

Transfer 14 KB

Monthly Cost ₽55/mo

mc.yandex.ru

Other

Costly

Execution 180ms

Transfer 85 KB

Unused 59%

Monthly Cost ₽53/mo

m.ok.ru

Other

Optional

Execution 115ms

Transfer 244 KB

Unused 87%

Monthly Cost ₽34/mo

top-fwz1.mail.ru

Other

Optional

Execution 108ms

Transfer 20 KB

Monthly Cost ₽32/mo

m.ok.ru

Other

Optional

Execution 91ms

Transfer 227 KB

Unused 88%

Monthly Cost ₽27/mo

m.ok.ru

Other

Optional

Execution 81ms

Transfer 227 KB

Unused 88%

Monthly Cost ₽24/mo

m.ok.ru

Other

Optional

Execution 72ms

Transfer 0 KB

Unused 88%

Monthly Cost ₽21/mo

These scripts may cost more than they're worth

Unattributable adds 1003ms and costs ~₽297/month
m.ok.ru adds 468ms and costs ~₽139/month
privacy-cs.mail.ru adds 371ms and costs ~₽110/month
m.ok.ru adds 293ms and costs ~₽87/month
m.ok.ru adds 228ms and costs ~₽67/month
m.ok.ru adds 217ms and costs ~₽64/month
m.ok.ru adds 192ms and costs ~₽57/month
m.ok.ru adds 190ms and costs ~₽56/month
m.ok.ru adds 186ms and costs ~₽55/month
mc.yandex.ru adds 180ms and costs ~₽53/month

100% 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

Unattributable takes 1003ms 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

m.ok.ru takes 468ms 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 m.ok.ru'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

privacy-cs.mail.ru takes 371ms 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

m.ok.ru takes 293ms 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

m.ok.ru takes 228ms 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

54% of m.ok.ru'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

m.ok.ru takes 217ms 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

54% of m.ok.ru'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

m.ok.ru takes 192ms 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

94% of m.ok.ru'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

m.ok.ru takes 190ms 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

m.ok.ru takes 186ms 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

mc.yandex.ru takes 180ms 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

59% of mc.yandex.ru'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

87% of m.ok.ru'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

88% of m.ok.ru'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

88% of m.ok.ru'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

88% of m.ok.ru'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.