Performance
· 17 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.
6.74 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
17.34 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.97 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.111
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
10.73 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.
27.06 s
Page Load Progression
FPage Weight BudgetAction4.6 MB transferred, 283 requestsFIX
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
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
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 ImpactAction83% third-party, 0 ms blockingFIX
FJS Execution CostAction8207ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://cdn.selectel.ru/site_v3/_nuxt_v3/DwojNK-9.js | 2973ms | 2754ms | 2ms | 3rd |
| Unattributable | 1310ms | 192ms | 0ms | 3rd |
| https://selectel.ru/ | 986ms | 38ms | 1ms | 1st |
| https://cdn.selectel.ru/site_v3/_nuxt_v3/Djug9Uf8.js | 936ms | 517ms | 0ms | 3rd |
| https://api.mindbox.ru/scripts/v1/tracker.js | 417ms | 174ms | 179ms | 3rd |
| https://hog.selectel.ru/static/recorder.js?v=1.68.1 | 341ms | 90ms | 5ms | 3rd |
| https://chatwoot.selectel.ru/vite/assets/widget-DZkOsJcV.js | 297ms | 264ms | 1ms | 3rd |
| https://cdn.selectel.ru/site_v3/_nuxt_v3/CH_iu5NA.js | 251ms | 56ms | 0ms | 3rd |
| https://metrics.selectel.ru/js/container_MIheIjCo.js | 185ms | 136ms | 43ms | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 175ms | 147ms | 24ms | 3rd |
Showing top 10 of 13 scripts
FJS BundlesAction171 scripts, 602 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 | 51 KB (37%) | ✓ | 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://cdn.selectel.ru/site_v3/_nuxt_v3/BMizhySc.js | 67 KB | 37 KB (55%) | ✓ | 3rd |
| https://chatwoot.selectel.ru/vite/assets/vue-dompurify-html-B9EYdvnm.js | 131 KB | 30 KB (23%) | ✓ | 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 InventoryAction283 resources · 4.6 MB · 602 KB savings availableFIX
~601.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 283 resources | 4.6 MiB | ||||||
DHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction40 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 Hints10 hints, 0 missing preconnectsPASS
Current Resource Hints
10 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall283 requests over 5541msINFO
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 | 2973ms | 137 KB | 37% | ₽880/mo | Costly |
Unattributable Unattributable | Other | 1310ms | 0 KB | — | ₽388/mo | Costly |
cdn.selectel.ru cdn.selectel.ru | Other | 936ms | 30 KB | — | ₽277/mo | Costly |
api.mindbox.ru api.mindbox.ru | Other | 417ms | 29 KB | — | ₽123/mo | Costly |
hog.selectel.ru hog.selectel.ru | Other | 341ms | 20 KB | — | ₽101/mo | Costly |
chatwoot.selectel.ru chatwoot.selectel.ru | Other | 297ms | 91 KB | 44% | ₽88/mo | Costly |
cdn.selectel.ru cdn.selectel.ru | Other | 251ms | 28 KB | — | ₽74/mo | Costly |
metrics.selectel.ru metrics.selectel.ru | Other | 185ms | 52 KB | — | ₽55/mo | Costly |
mc.yandex.ru mc.yandex.ru | Other | 175ms | 85 KB | 66% | ₽52/mo | Costly |
widgets.mango-office.ru widgets.mango-office.ru | Other | 143ms | 35 KB | — | ₽42/mo | Optional |
top-fwz1.mail.ru top-fwz1.mail.ru | Other | 112ms | 20 KB | — | ₽33/mo | Optional |
cdn.selectel.ru cdn.selectel.ru | Other | 83ms | 67 KB | 55% | ₽25/mo | Optional |
These scripts may cost more than they're worth
- cdn.selectel.ru adds 2973ms and costs ~₽880/month
- Unattributable adds 1310ms and costs ~₽388/month
- cdn.selectel.ru adds 936ms and costs ~₽277/month
- api.mindbox.ru adds 417ms and costs ~₽123/month
- hog.selectel.ru adds 341ms and costs ~₽101/month
- chatwoot.selectel.ru adds 297ms and costs ~₽88/month
- cdn.selectel.ru adds 251ms and costs ~₽74/month
- metrics.selectel.ru adds 185ms and costs ~₽55/month
- mc.yandex.ru adds 175ms and costs ~₽52/month
88% 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 2973ms 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 1310ms 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 936ms 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
api.mindbox.ru takes 417ms 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
hog.selectel.ru takes 341ms 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
chatwoot.selectel.ru takes 297ms 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 251ms 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
metrics.selectel.ru takes 185ms 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
mc.yandex.ru takes 175ms 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
66% of mc.yandex.ru's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
55% of cdn.selectel.ru's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev