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.

2.71 s

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

5.47 s

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

5.92 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.

7.13 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.

23.95 s

Page Load Progression

537 ms

1.1 s

1.6 s

2.1 s

2.7 s

3.2 s

3.8 s

4.3 s

Checks

7 PASS 3 REVIEW 5 FIX

Page Weight Budget

Action

3.2 MB transferred, 117 requests

FIX

3.2 MB transferred, 117 requests

Page weighs 9.8 MB (3.2 MB transferred)

JavaScript is 1.9 MB — consider code splitting or lazy loading

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

Got: 1.9 MB

117 HTTP requests — consider bundling or reducing

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

Estimated 0.66 g CO2 per page load

3.2 MB transferred

117 requests

0.66 g CO2 per page load

JavaScript 1.9 MiB 61%

Images 658.3 KiB 20%

Other 227.2 KiB 7%

Fonts 136.4 KiB 4%

CSS 110.8 KiB 3%

HTML 56.3 KiB 2%

Other 47.0 KiB 1%

Other 5.7 KiB 0%

Other 1.4 KiB 0%

Other 937 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

93% third-party, 0 ms blocking

FIX

93% third-party, 0 ms blocking

Third-party code accounts for 93% of page weight (2.9 MiB of 3.2 MiB)

Third-party blocking time is low (0 ms)

93%

First-party Third-party

JS Execution Cost

Action

16310ms total JS execution

FIX

16310ms total JS execution

https://pikabu.ru/.well-known/ddos-guard/check: 5488ms CPU time

https://pikabu.ru/: 2666ms CPU time

Unattributable: 2133ms CPU time

https://cs.pikabu.ru/apps/ub/5.4.700/mobile/vendor...: 1688ms CPU time

https://cs.pikabu.ru/apps/ub/5.4.703/mobile/app.a0...: 997ms CPU time

Third-party scripts: 8157ms (50% of total)

Main Thread Breakdown

Script Evaluation 41% Style & Layout 33% Other 15% Script Parsing & Compilation 5%

Script	Total	Scripting	Parse/Compile	Party
https://pikabu.ru/.well-known/ddos-guard/check	5488ms	1514ms	35ms	1st
https://pikabu.ru/	2666ms	153ms	31ms	1st
Unattributable	2133ms	535ms	0ms	3rd
https://cs.pikabu.ru/apps/ub/5.4.700/mobile/vendors.edb3f6438953.mo.js	1688ms	1119ms	135ms	3rd
https://cs.pikabu.ru/apps/ub/5.4.703/mobile/app.a00e5602742c.mo.js	997ms	663ms	202ms	3rd
https://cs.pikabu.ru/apps/ub/5.4.703/mobile/ui.16cfa80c1f17.mo.js	859ms	783ms	64ms	3rd
https://yandex.ru/ads/system/context.js	576ms	407ms	42ms	3rd
https://www.googletagmanager.com/gtag/js?id=G-GDRZR2E90Y	405ms	351ms	51ms	3rd
https://privacy-cs.mail.ru/static/sync-loader.js	356ms	302ms	19ms	3rd
https://mc.yandex.ru/metrika/tag.js	320ms	277ms	26ms	3rd

Showing top 10 of 15 scripts

JS Bundles

Action

20 scripts, 1.0 MB unused

FIX

20 scripts, 1.0 MB unused

https://cs.pikabu.ru/apps/ub/5.4.703/mobile/app.a0...: 275 KB unused (73%)

Consider code splitting or tree shaking to reduce unused code.

https://cs.pikabu.ru/apps/ub/5.4.700/mobile/vendor...: 250 KB unused (72%)

Consider code splitting or tree shaking to reduce unused code.

https://cs.pikabu.ru/apps/ub/5.4.703/mobile/ui.16c...: 128 KB unused (87%)

Consider code splitting or tree shaking to reduce unused code.

https://yastatic.net/partner-code-bundles/1304651/...: 103 KB unused (79%)

Consider code splitting or tree shaking to reduce unused code.

https://www.googletagmanager.com/gtag/js?id=G-GDRZ...: 68 KB unused (39%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 1.0 MB

1049 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://cs.pikabu.ru/apps/ub/5.4.703/mobile/app.a00e5602742c.mo.js	382 KB	275 KB (73%)	✓	3rd
https://cs.pikabu.ru/apps/ub/5.4.700/mobile/vendors.edb3f6438953.mo.js	347 KB	250 KB (72%)	✓	3rd
https://cs.pikabu.ru/apps/ub/5.4.703/mobile/ui.16cfa80c1f17.mo.js	148 KB	128 KB (87%)	✓	3rd
https://yastatic.net/partner-code-bundles/1304651/00cc0164cd639ddf.js	130 KB	103 KB (79%)	✓	3rd
https://www.googletagmanager.com/gtag/js?id=G-GDRZR2E90Y	176 KB	68 KB (39%)	✓	3rd
https://yandex.ru/ads/system/context.js	105 KB	62 KB (60%)	✓	3rd
https://pikabu.ru/.well-known/ddos-guard/check	177 KB	52 KB (29%)	✓	1st
https://mc.yandex.ru/metrika/tag.js	85 KB	44 KB (52%)	✓	3rd
https://cs.pikabu.ru/apps/ub/5.4.621/mobile/vendors-editor.626cedc51779.mo.js	40 KB	40 KB (100%)	✓	3rd
https://yastatic.net/partner-code-bundles/1304651/22d10f9d8e892aab.js	32 KB	27 KB (85%)	✓	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

117 resources · 3.2 MB · 1.0 MB savings available

FIX

117 resources · 3.2 MB · 1.0 MB savings available

Page weight 2.2 MB over 1MB target

Got: 3.2 MB Expected: ≤ 1 MB

~1.0 MB of savings available

109 third-party resources (93% of weight)

4 resources over 200KB

117 resources · 3.2 MiB · 109 third-party 2.2 MiB over 1MB target

JavaScript 61% · 1.9 MiB

Image 28% · 917.7 KiB

Font 4% · 136.4 KiB

CSS 3% · 110.8 KiB

Document 2% · 58.3 KiB

Other 1% · 20.9 KiB

~1.0 MiB of savings available

Remove unused JavaScript: 1.0 MiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

117 resources			3.2 MiB

Image Optimization

36 images, 0 KB saveable

REVIEW

36 images, 0 KB saveable

All images are well-optimized

36 images 568 KB

0 oversized -0 KB

27 legacy format

0 missing dimensions CLS risk

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

no-cache

REVIEW

no-cache

Cache-Control header is set

Got: no-cache

No ETag or Last-Modified header

Conditional requests (304 Not Modified) are not possible without validators.

Cache-Control

no-cache

Directive	Value	Meaning
no-cache	—	Cache but always revalidate first

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

4 fonts (136 KB)

PASS

4 fonts (136 KB)

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

Web fonts

136 KB total

Render-blocking

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

roboto-regular.woff2 woff2 swap

Size 22 KB

Load time 64 ms

Start 840 ms

Risk FOUT — text flashes from fallback to web font

roboto-500.woff2 woff2 swap

Size 23 KB

Load time 82 ms

Start 841 ms

Risk FOUT — text flashes from fallback to web font

roboto-bold.woff2 woff2 swap

Size 66 KB

Load time 58 ms

Start 842 ms

Risk FOUT — text flashes from fallback to web font

text-variable-full.woff2 woff2 swap

Size 26 KB

Load time 79 ms

Start 6.0 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

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

9 hints, 0 missing preconnects

PASS

9 hints, 0 missing preconnects

Page uses 9 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

9 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

117 requests over 7730ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

50% of JavaScript execution is third-party

First-party Third-party 8157ms · 1592KB · ₽2415/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	2133ms	0 KB	—	₽631/mo	Costly
cs.pikabu.ru cs.pikabu.ru	Other	1688ms	347 KB	72%	₽500/mo	Costly
cs.pikabu.ru cs.pikabu.ru	Other	997ms	382 KB	73%	₽295/mo	Costly
cs.pikabu.ru cs.pikabu.ru	Other	859ms	148 KB	87%	₽254/mo	Costly
yandex.ru yandex.ru	Other	576ms	105 KB	60%	₽171/mo	Costly
Google Tag Manager www.googletagmanager.com	Tag Manager	405ms	176 KB	39%	₽120/mo	Costly
privacy-cs.mail.ru privacy-cs.mail.ru	Other	356ms	22 KB	—	₽105/mo	Costly
mc.yandex.ru mc.yandex.ru	Other	320ms	85 KB	52%	₽95/mo	Costly
yandex.ru yandex.ru	Other	279ms	37 KB	—	₽83/mo	Costly
yastatic.net yastatic.net	Other	196ms	130 KB	79%	₽58/mo	Costly
top-fwz1.mail.ru top-fwz1.mail.ru	Other	166ms	20 KB	—	₽49/mo	Optional
cs.pikabu.ru cs.pikabu.ru	Other	110ms	111 KB	—	₽33/mo	Optional
yandex.ru yandex.ru	Other	72ms	28 KB	—	₽21/mo	Optional

Unattributable

Other

Costly

Execution 2133ms

Transfer 0 KB

Monthly Cost ₽631/mo

cs.pikabu.ru

Other

Costly

Execution 1688ms

Transfer 347 KB

Unused 72%

Monthly Cost ₽500/mo

cs.pikabu.ru

Other

Costly

Execution 997ms

Transfer 382 KB

Unused 73%

Monthly Cost ₽295/mo

cs.pikabu.ru

Other

Costly

Execution 859ms

Transfer 148 KB

Unused 87%

Monthly Cost ₽254/mo

yandex.ru

Other

Costly

Execution 576ms

Transfer 105 KB

Unused 60%

Monthly Cost ₽171/mo

Google Tag Manager

Tag Manager

Costly

Execution 405ms

Transfer 176 KB

Unused 39%

Monthly Cost ₽120/mo

privacy-cs.mail.ru

Other

Costly

Execution 356ms

Transfer 22 KB

Monthly Cost ₽105/mo

mc.yandex.ru

Other

Costly

Execution 320ms

Transfer 85 KB

Unused 52%

Monthly Cost ₽95/mo

yandex.ru

Other

Costly

Execution 279ms

Transfer 37 KB

Monthly Cost ₽83/mo

yastatic.net

Other

Costly

Execution 196ms

Transfer 130 KB

Unused 79%

Monthly Cost ₽58/mo

top-fwz1.mail.ru

Other

Optional

Execution 166ms

Transfer 20 KB

Monthly Cost ₽49/mo

cs.pikabu.ru

Other

Optional

Execution 110ms

Transfer 111 KB

Monthly Cost ₽33/mo

yandex.ru

Other

Optional

Execution 72ms

Transfer 28 KB

Monthly Cost ₽21/mo

These scripts may cost more than they're worth

Unattributable adds 2133ms and costs ~₽631/month
cs.pikabu.ru adds 1688ms and costs ~₽500/month
cs.pikabu.ru adds 997ms and costs ~₽295/month
cs.pikabu.ru adds 859ms and costs ~₽254/month
yandex.ru adds 576ms and costs ~₽171/month
Google Tag Manager adds 405ms and costs ~₽120/month
privacy-cs.mail.ru adds 356ms and costs ~₽105/month
mc.yandex.ru adds 320ms and costs ~₽95/month
yandex.ru adds 279ms and costs ~₽83/month
yastatic.net adds 196ms and costs ~₽58/month

50% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 2133ms 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

cs.pikabu.ru takes 1688ms 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

72% of cs.pikabu.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

cs.pikabu.ru takes 997ms 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

73% of cs.pikabu.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

cs.pikabu.ru takes 859ms 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

87% of cs.pikabu.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

yandex.ru takes 576ms 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

60% of 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

Google Tag Manager takes 405ms 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

privacy-cs.mail.ru 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

mc.yandex.ru takes 320ms 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

52% 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

yandex.ru takes 279ms 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

yastatic.net takes 196ms 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

79% of yastatic.net'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.