Performance

· 15 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.

2.37 s

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

2.37 s

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

0 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.

2.53 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.

2.37 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

8 PASS 3 REVIEW 2 FIX

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 (190.2 KiB of 190.2 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

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

5 images, 0 KB saveable

REVIEW

5 images, 0 KB saveable

data:image/png;base64, is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

data:image/png;base64,R0lGODdhNgFQAIQAAHRydLy6vNze... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

5 images 0 KB

0 oversized -0 KB

3 legacy format

2 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

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

JS Bundles

2 scripts, 83 KB unused

REVIEW

2 scripts, 83 KB unused

https://mc.yandex.ru/metrika/tag.js: 51 KB unused (60%)

Consider code splitting or tree shaking to reduce unused code.

https://www.rt.ru/TSbd/081c0a6604ab20008a603e0332a...: 32 KB unused (56%)

Consider code splitting or tree shaking to reduce unused code.

Total unused JavaScript: 83 KB

83 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://mc.yandex.ru/metrika/tag.js	85 KB	51 KB (60%)	✓	3rd
https://www.rt.ru/TSbd/081c0a6604ab20008a603e0332ab610d98b8160140d6f74de8bda024830ba74e74b8ffe890c707f8?type=4	58 KB	32 KB (56%)	✓	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

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

190 KB transferred, 14 requests

PASS

190 KB transferred, 14 requests

Page weighs 496 KB (190 KB transferred)

14 HTTP requests

Estimated 0.04 g CO2 per page load

190 KB transferred

14 requests

0.04 g CO2 per page load

JavaScript 143.4 KiB 75%

HTML 41.9 KiB 22%

Other 3.7 KiB 2%

Other 986 B 1%

Images 335 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

JS Execution Cost

67ms total JS execution

PASS

67ms total JS execution

https://mc.yandex.ru/metrika/tag.js: 67ms CPU time

Third-party scripts: 67ms (100% of total)

Main Thread Breakdown

Script Evaluation 55% Other 24% Script Parsing & Compilation 10% Style & Layout 9%

Script	Total	Scripting	Parse/Compile	Party
https://mc.yandex.ru/metrika/tag.js	67ms	55ms	9ms	3rd

A+

Font Loading

No web fonts (system fonts)

PASS

No web fonts (system fonts)

No web fonts loaded — system fonts are fastest

No web fonts loaded — system fonts are optimal.

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

Page Weight Inventory

14 resources · 190 KB · 83 KB savings available

PASS

14 resources · 190 KB · 83 KB savings available

Within 1MB page-weight target

Got: 190 KB

~83 KB of savings available

13 third-party resources (100% of weight)

14 resources · 190.2 KiB · 13 third-party Within 1MB page-weight target

JavaScript 75% · 143.4 KiB

Document 22% · 42.0 KiB

Other 2% · 4.6 KiB

Image 0% · 335 B

~83.2 KiB of savings available

Remove unused JavaScript: 83.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

14 resources			190.2 KiB

Network Waterfall

14 requests over 5232ms

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 67ms · 85KB · ₽20/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
mc.yandex.ru mc.yandex.ru	Other	67ms	85 KB	60%	₽20/mo	Optional

mc.yandex.ru

Other

Optional

Execution 67ms

Transfer 85 KB

Unused 60%

Monthly Cost ₽20/mo

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

60% 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.