https://ark-russia.ru
Performance
· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.SCORE
86
GRADE
B
FIX
1
REVIEW
9
PASS
9
INFO
3
Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
78
94
92
92
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.42 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.49 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
32 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.
2.31 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.
2.49 s
Page Load Progression
814 ms
1.6 s
2.4 s
3.3 s
4.1 s 4.9 s
5.7 s
6.5 sChecks
229 PASS 9 REVIEW 1 FIX
DPage Weight InventoryAction40 resources · 1.4 MB · 72 KB savings availableFIX
Page Weight Inventory
Action40 resources · 1.4 MB · 72 KB savings available
40 resources · 1.4 MB · 72 KB savings available
Warning::
Page weight 1.4 MB exceeds 1 MB target by 410 KB
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~72 KB of savings available
Warning::
14 third-party resources (58% of weight)
Info::
3 resources over 200KB
40 resources · 1.4 MiB · 14 third-party 410.3 KiB over 1MB target
Image 78% · 1.1 MiB
JavaScript 17% · 243.5 KiB
Other 3% · 40.8 KiB
CSS 2% · 25.8 KiB
Document 1% · 12.0 KiB
~71.6 KiB of savings available
Remove unused JavaScript: 71.6 KiB
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 40 resources | 1.4 MiB | ||||||
BPage Weight Budget1.4 MB transferred, 40 requestsREVIEW
Page Weight Budget
1.4 MB transferred, 40 requests
1.4 MB transferred, 40 requests
Info::
Page weighs 2.1 MB (1.4 MB transferred)
Warning::
Images are 1.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.1 MB
Info::
40 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB transferred
40 requests
0.29 g CO2 per page load
Images 1.1 MiB 76%
JavaScript 243.5 KiB 17%
Other 37.2 KiB 3%
CSS 25.8 KiB 2%
Other 18.6 KiB 1%
HTML 8.4 KiB 1%
Other 3.5 KiB 0%
0 2.4 MB 4.9 MB
Under 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
BThird-Party Impact58% third-party, 0 ms blockingREVIEW
Third-Party Impact
58% third-party, 0 ms blocking
58% third-party, 0 ms blocking
Warning::
Third-party code accounts for 58% of page weight (826.4 KiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
42%
58%
First-party Third-party
BImage Optimization9 images, 0 KB saveableREVIEW
Image Optimization
9 images, 0 KB saveable
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 1.1 MB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
CJS Execution CostAction1227ms total JS executionREVIEW
JS Execution Cost
Action1227ms total JS execution
1227ms total JS execution
Warning::
https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js: 353ms CPU time
Warning::
https://ark-russia.ru/: 310ms CPU time
Info::
https://ark-russia.ru/assets/react-router-DudbOYXU...: 237ms CPU time
Info::
https://mc.yandex.ru/metrika/tag.js?id=110632696: 172ms CPU time
Info::
Unattributable: 155ms CPU time
Info::
Third-party scripts: 172ms (14% of total)
Main Thread Breakdown
Script Evaluation 40% Other 36% Style & Layout 18% Rendering 5%
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js | 353ms | 66ms | 0ms | 1st |
| https://ark-russia.ru/ | 310ms | 49ms | 0ms | 1st |
| https://ark-russia.ru/assets/react-router-DudbOYXU.js | 237ms | 210ms | 0ms | 1st |
| https://mc.yandex.ru/metrika/tag.js?id=110632696 | 172ms | 156ms | 10ms | 3rd |
| Unattributable | 155ms | 13ms | 0ms | 1st |
BJS Bundles11 scripts, 72 KB unusedREVIEW
JS Bundles
11 scripts, 72 KB unused
11 scripts, 72 KB unused
Warning::
https://mc.yandex.ru/metrika/tag.js?id=110632696: 43 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ark-russia.ru/assets/react-router-DudbOYXU...: 29 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ark-russia.ru/assets/ui-motion-CNFuVI6_.js: unminified — 5 KB could be saved
Info::
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
BHTTP/3 (QUIC)HTTP/3 not advertisedREVIEW
HTTP/3 (QUIC)
HTTP/3 not advertised
HTTP/3 not advertised
Info::
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.
BCompression AlgorithmMain response uses gzip; brotli would be ~20% smallerREVIEW
Compression Algorithm
Main response uses gzip; brotli would be ~20% smaller
Main response uses gzip; brotli would be ~20% smaller
Info::
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.
BServer-Timing ObservabilityNo Server-Timing header foundREVIEW
Server-Timing Observability
No Server-Timing header found
No Server-Timing header found
Info::
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
Text Compression
All text resources are compressed
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+Font LoadingNo web fonts (system fonts)PASS
Font Loading
No web fonts (system fonts)
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+Resource CachingAll resources properly cachedPASS
Resource Caching
All resources properly cached
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+Critical Rendering PathNo render-blocking resourcesPASS
Critical Rendering Path
No render-blocking resources
No render-blocking resources
Info::
No render-blocking resources detected
A+Resource HintsNo optimization neededPASS
Resource Hints
No optimization needed
No optimization needed
Info::
No resource hint issues
A+LCP Image PreloadLCP preload audit not availablePASS
LCP Image Preload
LCP preload audit not available
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+Main HTML Cache-ControlMain HTML max-age=60 (≤ 5min) is appropriatePASS
Main HTML Cache-Control
Main HTML max-age=60 (≤ 5min) is appropriate
Main HTML max-age=60 (≤ 5min) is appropriate
Info::
Main HTML max-age=60 (≤ 5min) is appropriate
Got: public, max-age=60, stale-while-revalidate=300
AServer Response Intelligence2 server-response signal(s) detectedPASS
Server Response Intelligence
2 server-response signal(s) detected
2 server-response signal(s) detected
Warning::
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.
Info::
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.
AHTTP Cachingmax-age=60 (1 minute)PASS
HTTP Caching
max-age=60 (1 minute)
max-age=60 (1 minute)
Info::
Cache-Control header is set
Got: public, max-age=60, stale-while-revalidate=300
Info::
Effective TTL: 1 minute (max-age=60)
Info::
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 Waterfall40 requests over 4476msINFO
Network Waterfall
40 requests over 4476ms
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
14% of JavaScript execution is third-party
First-party Third-party 172ms · 87KB · ₽90/mo
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
mc.yandex.ru mc.yandex.ru | Other | 172ms | 87 KB | 49% | ₽90/mo | Costly |
mc.yandex.ru
Other
Execution 172ms
Transfer 87 KB
Unused 49%
Monthly Cost ₽90/mo
These scripts may cost more than they're worth
- mc.yandex.ru adds 172ms and costs ~₽90/month
mc.yandex.ru takes 172ms 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
Image Optimization10 images, 1216 KB total, 323 KB wastedINFO
Image Optimization
10 images, 1216 KB total, 323 KB wasted
Image Optimization Audit
Total Images
10
Total Size
1216 KB
Oversized
2
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.