Performance
· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
1.47 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.78 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
219 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.038
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.30 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.
4.21 s
Page Load Progression
FPage Weight BudgetAction5.2 MB transferred, 279 requestsFIX
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
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.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
Source: web.dev
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction80% third-party, 0 ms blockingFIX
FJS Execution CostAction3569ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn.selectel.ru/site_v3/_nuxt_v3/Djug9Uf8.js | 1390ms | 222ms | 0ms | 3rd |
| https://cdn.selectel.ru/site_v3/_nuxt_v3/DwojNK-9.js | 788ms | 715ms | 0ms | 3rd |
| https://selectel.ru/ | 592ms | 32ms | 0ms | 1st |
| Unattributable | 476ms | 50ms | 0ms | 3rd |
| https://chatwoot.selectel.ru/vite/assets/widget-DZkOsJcV.js | 93ms | 84ms | 0ms | 3rd |
| https://cdn.selectel.ru/site_v3/_nuxt_v3/CH_iu5NA.js | 81ms | 26ms | 0ms | 3rd |
| https://hog.selectel.ru/static/recorder.js?v=1.68.1 | 75ms | 21ms | 1ms | 3rd |
| https://api.mindbox.ru/scripts/v1/tracker.js | 73ms | 26ms | 42ms | 3rd |
FJS BundlesAction165 scripts, 588 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://chatwoot.selectel.ru/vite/assets/index-B2oV7ar2.js | 317 KB | 121 KB (41%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/_plugin-vue_export-helper-_02b8cOM.js | 168 KB | 107 KB (63%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/Validators-DbEVPLSt.js | 90 KB | 58 KB (65%) | ✓ | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 85 KB | 56 KB (66%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/utils.esm-CYAcZXQv.js | 83 KB | 56 KB (67%) | ✓ | 3rd |
| https://cdn.selectel.ru/site_v3/_nuxt_v3/DwojNK-9.js | 137 KB | 49 KB (36%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/useBranding-ABUCmbFD.js | 87 KB | 47 KB (54%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/widget-DZkOsJcV.js | 91 KB | 40 KB (44%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/vue-dompurify-html-B9EYdvnm.js | 131 KB | 30 KB (23%) | ✓ | 3rd |
| https://cdn.selectel.ru/site_v3/_nuxt_v3/BMizhySc.js | 67 KB | 26 KB (39%) | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction279 resources · 5.2 MB · 588 KB savings availableFIX
~588.2 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 279 resources | 5.2 MiB | ||||||
DHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction43 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (146 KB)PASS
Web fonts
3
146 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall279 requests over 31462msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
cdn.selectel.ru cdn.selectel.ru | Other | 1390ms | 30 KB | — | ₽412/mo | Costly |
cdn.selectel.ru cdn.selectel.ru | Other | 788ms | 137 KB | 36% | ₽233/mo | Costly |
Unattributable Unattributable | Other | 476ms | 0 KB | — | ₽141/mo | Costly |
chatwoot.selectel.ru chatwoot.selectel.ru | Other | 93ms | 91 KB | 44% | ₽27/mo | Optional |
cdn.selectel.ru cdn.selectel.ru | Other | 81ms | 28 KB | — | ₽24/mo | Optional |
hog.selectel.ru hog.selectel.ru | Other | 75ms | 20 KB | — | ₽22/mo | Optional |
api.mindbox.ru api.mindbox.ru | Other | 73ms | 29 KB | — | ₽22/mo | Optional |
These scripts may cost more than they're worth
- cdn.selectel.ru adds 1390ms and costs ~₽412/month
- cdn.selectel.ru adds 788ms and costs ~₽233/month
- Unattributable adds 476ms and costs ~₽141/month
83% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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
cdn.selectel.ru takes 1390ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
cdn.selectel.ru takes 788ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 476ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev