Performance

· 26 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.

2.20 s

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

4.84 s

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

279 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.

4.88 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.

6.95 s

Page Load Progression

804 ms

1.6 s

2.4 s

3.2 s

4.0 s

4.8 s

5.6 s

6.4 s

Checks

13 PASS 9 REVIEW 1 FIX

JS Execution Cost

Action

5755ms total JS execution

FIX

5755ms total JS execution

https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js: 2007ms CPU time

https://ark-russia.ru/: 1517ms CPU time

https://ark-russia.ru/assets/react-router-DudbOYXU...: 947ms CPU time

https://mc.yandex.ru/metrika/tag.js?id=110632696: 805ms CPU time

Unattributable: 479ms CPU time

Third-party scripts: 805ms (14% of total)

Main Thread Breakdown

Script Evaluation 38% Other 33% Style & Layout 21% Rendering 6%

Script	Total	Scripting	Parse/Compile	Party
https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js	2007ms	471ms	1ms	1st
https://ark-russia.ru/	1517ms	127ms	2ms	1st
https://ark-russia.ru/assets/react-router-DudbOYXU.js	947ms	838ms	1ms	1st
https://mc.yandex.ru/metrika/tag.js?id=110632696	805ms	738ms	33ms	3rd
Unattributable	479ms	48ms	0ms	1st

Page Weight Budget

1.1 MB transferred, 39 requests

REVIEW

1.1 MB transferred, 39 requests

Page weighs 1.8 MB (1.1 MB transferred)

39 HTTP requests

Estimated 0.23 g CO2 per page load

1.1 MB transferred

39 requests

0.23 g CO2 per page load

Images 809.0 KiB 71%

JavaScript 243.6 KiB 21%

Other 36.8 KiB 3%

CSS 25.8 KiB 2%

Other 19.0 KiB 2%

HTML 8.4 KiB 1%

Other 3.5 KiB 0%

0 2.4 MB 4.9 MB

Under budget

Third-Party Impact

47% third-party, 0 ms blocking

REVIEW

47% third-party, 0 ms blocking

Third-party code accounts for 47% of page weight (538.2 KiB of 1.1 MiB)

Third-party blocking time is low (0 ms)

53%

47%

First-party Third-party

Image Optimization

8 images, 0 KB saveable

REVIEW

8 images, 0 KB saveable

All images are well-optimized

8 images 809 KB

0 oversized -0 KB

6 legacy format

0 missing dimensions CLS risk

JS Bundles

11 scripts, 72 KB unused

REVIEW

11 scripts, 72 KB unused

https://mc.yandex.ru/metrika/tag.js?id=110632696: 43 KB unused (49%)

Consider code splitting or tree shaking to reduce unused code.

https://ark-russia.ru/assets/react-router-DudbOYXU...: 29 KB unused (38%)

Consider code splitting or tree shaking to reduce unused code.

https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js: unminified — 5 KB could be saved

Total unused JavaScript: 72 KB

72 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://mc.yandex.ru/metrika/tag.js?id=110632696	87 KB	43 KB (49%)	✓	3rd
https://ark-russia.ru/assets/react-router-DudbOYXU.js	76 KB	29 KB (38%)	✓	1st
https://ark-russia.ru/assets/index-dcnVirxE.js	22 KB	—	✓	1st
https://ark-russia.ru/assets/ui-radix-Du2wJpxq.js	1 KB	—	✓	1st
https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js	41 KB	—	✗	1st
https://ark-russia.ru/assets/Home-BcWpxe2q.js	4 KB	—	✓	1st
https://ark-russia.ru/assets/seo-CsiDgd6d.js	4 KB	—	✓	1st
https://ark-russia.ru/assets/NewsCard-CN0hFvY-.js	1 KB	—	✓	1st
https://ark-russia.ru/assets/wikiHelpers-DCFUp-F5.js	4 KB	—	✓	1st
https://ark-russia.ru/assets/ServerCard-B1mtrE0U.js	2 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

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

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.

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.

Page Weight Inventory

39 resources · 1.1 MB · 72 KB savings available

REVIEW

39 resources · 1.1 MB · 72 KB savings available

Page weight 1.1 MB exceeds 1 MB target by 122 KB

Got: 1.1 MB Expected: ≤ 1 MB

~72 KB of savings available

13 third-party resources (47% of weight)

2 resources over 200KB

39 resources · 1.1 MiB · 13 third-party 122.1 KiB over 1MB target

Image 72% · 824.0 KiB

JavaScript 21% · 243.6 KiB

Other 4% · 40.8 KiB

CSS 2% · 25.8 KiB

Document 1% · 12.0 KiB

~71.5 KiB of savings available

Remove unused JavaScript: 71.5 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

39 resources			1.1 MiB

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

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

1 hints, 0 missing preconnects

PASS

1 hints, 0 missing preconnects

Page uses 1 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

1 resource hints configured

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML max-age=60 (≤ 5min) is appropriate

PASS

Main HTML max-age=60 (≤ 5min) is appropriate

Got: public, max-age=60, stale-while-revalidate=300

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+

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

JavaScript Blocking

1 JS blocking issue(s) detected

PASS

1 JS blocking issue(s) detected

Total JS execution time is 5.8 s -- over the 3.5s budget

Total JavaScript execution (parse + compile + run) across all scripts exceeds 3.5 seconds. On low-end devices that becomes 7-15+ seconds and shows up directly in TBT and INP. Reduce by: tree-shaking unused dependencies, code-splitting (dynamic `import()`), removing or deferring third-party tracking, and replacing heavy frameworks where they're not needed.

A+

CSS Performance Depth

No CSS performance depth issues detected

PASS

No CSS performance depth issues detected

HTTP Caching

max-age=60 (1 minute)

PASS

max-age=60 (1 minute)

Cache-Control header is set

Got: public, max-age=60, stale-while-revalidate=300

Effective TTL: 1 minute (max-age=60)

No ETag or Last-Modified header

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

Cache-Control

public, max-age=60, stale-while-revalidate=300

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	60	Cache for 1 minute
stale-while-revalidate	300	Serve stale for 5 minutes while fetching fresh

Effective TTL: 60 seconds

Network Waterfall

39 requests over 4399ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

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

INFO

14% of JavaScript execution is third-party

First-party Third-party 805ms · 87KB · ₽419/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
mc.yandex.ru mc.yandex.ru	Other	805ms	87 KB	49%	₽419/mo	Costly

mc.yandex.ru

Other

Costly

Execution 805ms

Transfer 87 KB

Unused 49%

Monthly Cost ₽419/mo

These scripts may cost more than they're worth

mc.yandex.ru adds 805ms and costs ~₽419/month

mc.yandex.ru takes 805ms 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

10 images, 1216 KB total, 323 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1216 KB

Oversized

Wasted

323 KB

10 missing dimensions

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

Browse & Analyze

Learn

Performance

Page Load Progression

Green Hosting

These scripts may cost more than they're worth

Image Optimization Audit