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

100

SEO

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

3.69 s

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

7.88 s

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

1.09 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.

8.78 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.

21.20 s

Page Load Progression

545 ms

1.1 s

1.6 s

2.2 s

2.7 s

3.3 s

3.8 s

4.4 s

Checks

7 PASS 2 REVIEW 6 FIX

Page Weight Budget

Action

3.8 MB transferred, 208 requests

FIX

3.8 MB transferred, 208 requests

Page weighs 7.6 MB (3.8 MB transferred)

Images are 1.8 MB — compress or use modern formats

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Got: 1.8 MB

JavaScript is 1.4 MB — consider code splitting or lazy loading

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

Got: 1.4 MB

208 HTTP requests — consider bundling or reducing

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

Estimated 0.79 g CO2 per page load

3.8 MB transferred

208 requests

0.79 g CO2 per page load

Images 1.8 MiB 47%

JavaScript 1.4 MiB 37%

HTML 284.9 KiB 7%

Fonts 172.7 KiB 4%

CSS 50.2 KiB 1%

Other 47.6 KiB 1%

Other 18.7 KiB 0%

Other 16.2 KiB 0%

Other 5.6 KiB 0%

Other 1.0 KiB 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

73% third-party, 0 ms blocking

FIX

73% third-party, 0 ms blocking

Third-party code accounts for 73% of page weight (2.7 MiB of 3.8 MiB)

Third-party blocking time is low (0 ms)

27%

73%

First-party Third-party

JS Execution Cost

Action

9694ms total JS execution

FIX

9694ms total JS execution

https://tass.ru/_next/static/chunks/7748-dd4896fd9...: 2931ms CPU time

Unattributable: 1339ms CPU time

https://yastatic.net/partner-code-bundles/1304651/...: 1206ms CPU time

https://static.a.mts.ru/id/pixel.js: 817ms CPU time

https://tass.ru/: 590ms CPU time

Third-party scripts: 5949ms (61% of total)

Main Thread Breakdown

Script Evaluation 62% Other 20% Style & Layout 8% Script Parsing & Compilation 5%

Script	Total	Scripting	Parse/Compile	Party
https://tass.ru/_next/static/chunks/7748-dd4896fd997b89b2.js	2931ms	2363ms	25ms	1st
Unattributable	1339ms	146ms	0ms	3rd
https://yastatic.net/partner-code-bundles/1304651/22d10f9d8e892aab.js	1206ms	965ms	16ms	3rd
https://static.a.mts.ru/id/pixel.js	817ms	532ms	24ms	3rd
https://tass.ru/	590ms	24ms	13ms	1st
https://cdn-c.skcrtxr.com/wrapper/js/common-engine.js?v=s-dc1af2de-5f10-4ef6-a4db-cb39db302222	465ms	335ms	88ms	3rd
https://privacy-cs.mail.ru/static/sync-loader.js	363ms	306ms	7ms	3rd
https://x01.aidata.io/lib/aidata.fp.latest.js?pixel=0892394	296ms	236ms	18ms	3rd
https://yastatic.net/partner-code-bundles/1304651/e98eb32840226dc3.js	287ms	175ms	28ms	3rd
https://yandex.ru/ads/system/header-bidding.js	257ms	99ms	10ms	3rd

Showing top 10 of 17 scripts

JS Bundles

Action

56 scripts, 460 KB unused

FIX

56 scripts, 460 KB unused

https://cdn-c.skcrtxr.com/wrapper/js/common-engine...: 100 KB unused (66%)

Consider code splitting or tree shaking to reduce unused code.

https://yastatic.net/partner-code-bundles/1304651/...: 94 KB unused (73%)

Consider code splitting or tree shaking to reduce unused code.

https://mc.yandex.ru/metrika/tag.js: 44 KB unused (52%)

Consider code splitting or tree shaking to reduce unused code.

https://yandex.ru/ads/system/context.js: 44 KB unused (42%)

Consider code splitting or tree shaking to reduce unused code.

https://tass.ru/_next/static/chunks/7748-dd4896fd9...: 42 KB unused (48%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 460 KB

460 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://cdn-c.skcrtxr.com/wrapper/js/common-engine.js?v=s-dc1af2de-5f10-4ef6-a4db-cb39db302222	152 KB	100 KB (66%)	✓	3rd
https://yastatic.net/partner-code-bundles/1304651/00cc0164cd639ddf.js	130 KB	94 KB (73%)	✓	3rd
https://mc.yandex.ru/metrika/tag.js	85 KB	44 KB (52%)	✓	3rd
https://yandex.ru/ads/system/context.js	105 KB	44 KB (42%)	✓	3rd
https://tass.ru/_next/static/chunks/7748-dd4896fd997b89b2.js	89 KB	42 KB (48%)	✓	1st
https://mc.yandex.ru/metrika/watch.js	69 KB	37 KB (54%)	✓	3rd
https://x01.aidata.io/lib/aidata.fp.latest.js?pixel=0892394	60 KB	34 KB (58%)	✓	3rd
https://yastatic.net/partner-code-bundles/1304651/e98eb32840226dc3.js	58 KB	24 KB (42%)	✓	3rd
https://yastatic.net/partner-code-bundles/1304651/22d10f9d8e892aab.js	32 KB	21 KB (67%)	✓	3rd
https://tass.ru/_next/static/chunks/2938-5693946fcec2b1df.js	33 KB	20 KB (62%)	✓	1st

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

208 resources · 3.8 MB · 460 KB savings available

FIX

208 resources · 3.8 MB · 460 KB savings available

Page weight 2.8 MB over 1MB target

Got: 3.8 MB Expected: ≤ 1 MB

~460 KB of savings available

137 third-party resources (73% of weight)

4 resources over 200KB

208 resources · 3.8 MiB · 137 third-party 2.8 MiB over 1MB target

Image 47% · 1.8 MiB

JavaScript 37% · 1.4 MiB

Document 7% · 284.9 KiB

Font 4% · 172.7 KiB

Other 2% · 80.3 KiB

CSS 1% · 50.2 KiB

~460.2 KiB of savings available

Remove unused JavaScript: 460.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

208 resources			3.8 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

37 images, 0 KB saveable

REVIEW

37 images, 0 KB saveable

All images are well-optimized

37 images 1.8 MB

0 oversized -0 KB

30 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

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

6 fonts (173 KB)

PASS

6 fonts (173 KB)

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

Web fonts

173 KB total

Render-blocking

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

4f7e460f0ed992c7-s.p.woff2 woff2 swap

Size 28 KB

Load time 212 ms

Start 447 ms

Risk FOUT — text flashes from fallback to web font

5ea32c4c350bc59a-s.p.woff2 woff2 swap

Size 30 KB

Load time 277 ms

Start 447 ms

Risk FOUT — text flashes from fallback to web font

6798d18a06b66828-s.p.woff2 woff2 swap

Size 28 KB

Load time 219 ms

Start 448 ms

Risk FOUT — text flashes from fallback to web font

6e7c94890ec57ba0-s.p.woff2 woff2 swap

Size 30 KB

Load time 272 ms

Start 448 ms

Risk FOUT — text flashes from fallback to web font

c791b1caadba7d07-s.p.woff2 woff2 swap

Size 31 KB

Load time 274 ms

Start 448 ms

Risk FOUT — text flashes from fallback to web font

text-variable-full.woff2 woff2 swap

Size 26 KB

Load time 294 ms

Start 972 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)

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

No optimization needed

PASS

No optimization needed

No resource hint issues

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

208 requests over 31384ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

61% of JavaScript execution is third-party

First-party Third-party 5949ms · 831KB · ₽1761/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
Unattributable Unattributable	Other	1339ms	0 KB	—	₽396/mo	Costly
yastatic.net yastatic.net	Other	1206ms	32 KB	67%	₽357/mo	Costly
static.a.mts.ru static.a.mts.ru	Other	817ms	60 KB	—	₽242/mo	Costly
cdn-c.skcrtxr.com cdn-c.skcrtxr.com	Other	465ms	152 KB	66%	₽138/mo	Costly
privacy-cs.mail.ru privacy-cs.mail.ru	Other	363ms	22 KB	—	₽107/mo	Costly
x01.aidata.io x01.aidata.io	Other	296ms	60 KB	58%	₽88/mo	Costly
yastatic.net yastatic.net	Other	287ms	58 KB	42%	₽85/mo	Costly
yandex.ru yandex.ru	Other	257ms	38 KB	—	₽76/mo	Costly
mc.yandex.ru mc.yandex.ru	Other	241ms	85 KB	52%	₽71/mo	Costly
yandex.ru yandex.ru	Other	238ms	105 KB	42%	₽70/mo	Costly
yastatic.net yastatic.net	Other	159ms	130 KB	73%	₽47/mo	Optional
top-fwz1.mail.ru top-fwz1.mail.ru	Other	142ms	20 KB	—	₽42/mo	Optional
mc.yandex.ru mc.yandex.ru	Other	139ms	69 KB	54%	₽41/mo	Optional

Unattributable

Other

Costly

Execution 1339ms

Transfer 0 KB

Monthly Cost ₽396/mo

yastatic.net

Other

Costly

Execution 1206ms

Transfer 32 KB

Unused 67%

Monthly Cost ₽357/mo

static.a.mts.ru

Other

Costly

Execution 817ms

Transfer 60 KB

Monthly Cost ₽242/mo

cdn-c.skcrtxr.com

Other

Costly

Execution 465ms

Transfer 152 KB

Unused 66%

Monthly Cost ₽138/mo

privacy-cs.mail.ru

Other

Costly

Execution 363ms

Transfer 22 KB

Monthly Cost ₽107/mo

x01.aidata.io

Other

Costly

Execution 296ms

Transfer 60 KB

Unused 58%

Monthly Cost ₽88/mo

yastatic.net

Other

Costly

Execution 287ms

Transfer 58 KB

Unused 42%

Monthly Cost ₽85/mo

yandex.ru

Other

Costly

Execution 257ms

Transfer 38 KB

Monthly Cost ₽76/mo

mc.yandex.ru

Other

Costly

Execution 241ms

Transfer 85 KB

Unused 52%

Monthly Cost ₽71/mo

yandex.ru

Other

Costly

Execution 238ms

Transfer 105 KB

Unused 42%

Monthly Cost ₽70/mo

yastatic.net

Other

Optional

Execution 159ms

Transfer 130 KB

Unused 73%

Monthly Cost ₽47/mo

top-fwz1.mail.ru

Other

Optional

Execution 142ms

Transfer 20 KB

Monthly Cost ₽42/mo

mc.yandex.ru

Other

Optional

Execution 139ms

Transfer 69 KB

Unused 54%

Monthly Cost ₽41/mo

These scripts may cost more than they're worth

Unattributable adds 1339ms and costs ~₽396/month
yastatic.net adds 1206ms and costs ~₽357/month
static.a.mts.ru adds 817ms and costs ~₽242/month
cdn-c.skcrtxr.com adds 465ms and costs ~₽138/month
privacy-cs.mail.ru adds 363ms and costs ~₽107/month
x01.aidata.io adds 296ms and costs ~₽88/month
yastatic.net adds 287ms and costs ~₽85/month
yandex.ru adds 257ms and costs ~₽76/month
mc.yandex.ru adds 241ms and costs ~₽71/month
yandex.ru adds 238ms and costs ~₽70/month

61% 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 1339ms 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 1206ms 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

67% 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

static.a.mts.ru takes 817ms 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

cdn-c.skcrtxr.com takes 465ms 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

66% of cdn-c.skcrtxr.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

privacy-cs.mail.ru takes 363ms 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

x01.aidata.io takes 296ms 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

58% of x01.aidata.io'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

yastatic.net takes 287ms 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

yandex.ru takes 257ms 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 241ms 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 238ms 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 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

54% 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

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.