Performance

· 22 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

100

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.

1.57 s

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

1.57 s

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

6 ms

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

0.025

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

1.87 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.

1.79 s

Page Load Progression

698 ms

1.4 s

2.1 s

2.8 s

3.5 s

4.2 s

4.9 s

5.6 s

Checks

11 PASS 7 REVIEW 1 FIX

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

65 images, 0 KB saveable

REVIEW

65 images, 0 KB saveable

All images are well-optimized

65 images 619 KB

0 oversized -0 KB

65 legacy format

0 missing dimensions CLS risk

JS Execution Cost

Action

1517ms total JS execution

REVIEW

1517ms total JS execution

https://apprestore.ru/assets/app.js: 783ms CPU time

https://apprestore.ru/: 274ms CPU time

Unattributable: 230ms CPU time

https://mc.yandex.ru/metrika/tag.js?id=112174020: 230ms CPU time

Third-party scripts: 230ms (15% of total)

Main Thread Breakdown

Other 47% Style & Layout 21% Script Evaluation 20% Rendering 10%

Script	Total	Scripting	Parse/Compile	Party
https://apprestore.ru/assets/app.js	783ms	89ms	0ms	1st
https://apprestore.ru/	274ms	10ms	1ms	1st
Unattributable	230ms	9ms	0ms	1st
https://mc.yandex.ru/metrika/tag.js?id=112174020	230ms	196ms	11ms	3rd

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

HTTP/3 (QUIC) is not advertised

HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.

Compression Algorithm

Main response uses gzip; brotli would be ~20% smaller

REVIEW

Main response uses gzip; brotli would be ~20% smaller

Main HTML response uses gzip (brotli would be ~20% smaller)

All current browsers support brotli. Most CDNs (Cloudflare, Fastly, AWS CloudFront, Vercel, Netlify) can switch from gzip to brotli with a single config flag. Origin servers (nginx, Apache) need a brotli module compiled in -- nginx-brotli or Apache mod_brotli.

Main HTML Cache-Control

No Cache-Control header on main HTML response

REVIEW

No Cache-Control header on main HTML response

Main HTML response has no Cache-Control header

Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

Page Weight Budget

854 KB transferred, 79 requests

PASS

854 KB transferred, 79 requests

Page weighs 1014 KB (854 KB transferred)

79 HTTP requests

Estimated 0.17 g CO2 per page load

854 KB transferred

79 requests

0.17 g CO2 per page load

Images 619.0 KiB 72%

CSS 106.4 KiB 12%

JavaScript 105.6 KiB 12%

HTML 10.0 KiB 1%

Other 6.6 KiB 1%

Other 6.3 KiB 1%

Other 637 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

11% third-party, 0 ms blocking

PASS

11% third-party, 0 ms blocking

Third-party code accounts for 11% of page weight (92.3 KiB of 854.4 KiB)

Third-party blocking time is low (0 ms)

89%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

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.

JS Bundles

2 scripts, 42 KB unused

PASS

2 scripts, 42 KB unused

https://mc.yandex.ru/metrika/tag.js?id=112174020: 42 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

https://apprestore.ru/assets/app.js: unminified — 3 KB could be saved

Total unused JavaScript: 42 KB

42 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://mc.yandex.ru/metrika/tag.js?id=112174020	87 KB	42 KB (49%)	✓	3rd
https://apprestore.ru/assets/app.js	19 KB	—	✗	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

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+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

Server Response Intelligence

2 server-response signal(s) detected

PASS

2 server-response signal(s) detected

Compressed response missing `Vary` header

The page is served with `Content-Encoding: gzip` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.

No `ETag` or `Last-Modified` -- conditional GET not supported

Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.

A+

Page Weight Inventory

79 resources · 854 KB · 42 KB savings available

PASS

79 resources · 854 KB · 42 KB savings available

Within 1MB page-weight target

Got: 854 KB

10 third-party resources (11% of weight)

79 resources · 854.4 KiB · 10 third-party Within 1MB page-weight target

Image 73% · 621.5 KiB

CSS 12% · 106.4 KiB

JavaScript 12% · 105.6 KiB

Other 1% · 10.9 KiB

Document 1% · 10.0 KiB

~42.2 KiB of savings available

Remove unused JavaScript: 42.2 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

79 resources			854.4 KiB

Network Waterfall

79 requests over 4036ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

15% of JavaScript execution is third-party

First-party Third-party 230ms · 87KB · ₽120/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
mc.yandex.ru mc.yandex.ru	Other	230ms	87 KB	49%	₽120/mo	Costly

mc.yandex.ru

Other

Costly

Execution 230ms

Transfer 87 KB

Unused 49%

Monthly Cost ₽120/mo

These scripts may cost more than they're worth

mc.yandex.ru adds 230ms and costs ~₽120/month

mc.yandex.ru takes 230ms 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

How third-party costs are calculated

Image Optimization

65 images, 116 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

116 KB

57 missing dimensions

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.