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.
1.21 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.19 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
66 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.134
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.75 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.
4.19 s
Page Load Progression
531 ms 1.1 s
1.6 s 2.1 s
2.7 s
3.2 s 3.7 s
4.2 sDThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BPage Weight Budget1.2 MB transferred, 78 requestsREVIEW
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
CImage OptimizationAction27 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
CJS Execution CostAction1071ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.kommersant.ru/ | 252ms | 8ms | 5ms | 3rd |
| https://yandex.ru/ads/system/context.js | 239ms | 168ms | 13ms | 3rd |
| https://top-fwz1.mail.ru/js/code.js | 136ms | 117ms | 2ms | 3rd |
| Unattributable | 114ms | 10ms | 0ms | 3rd |
| https://iv.kommersant.ru/ContentFlex/Redesign2020/kom2021.commonAsyncJS.js?2604171836405483 | 114ms | 77ms | 5ms | 3rd |
| https://privacy-cs.mail.ru/static/sync-loader.js | 92ms | 78ms | 4ms | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 70ms | 54ms | 12ms | 3rd |
| https://iv.kommersant.ru/ContentFlex/Redesign2020/kom2021.lentaVue.js?2604171836405543 | 54ms | 40ms | 7ms | 3rd |
CJS BundlesAction19 scripts, 247 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://yastatic.net/partner-code-bundles/1304651/00cc0164cd639ddf.js | 130 KB | 105 KB (81%) | ✓ | 3rd |
| https://yandex.ru/ads/system/context.js | 105 KB | 53 KB (51%) | ✓ | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 85 KB | 43 KB (51%) | ✓ | 3rd |
| https://iv.kommersant.ru/ContentFlex/Redesign2020/kom2021.lentaVue.js?2604171836405543 | 67 KB | 26 KB (39%) | ✓ | 3rd |
| https://iv.kommersant.ru/ContentFlex/Redesign2020/kom2021.commonJS.js?2604171836405513 | 48 KB | 20 KB (43%) | ✓ | 3rd |
| https://im2.kommersant.ru/ContentFlex/Redesign2020/kom2021.lazyChunks/pushPopup_desktop-6e10174aed82dea790a5.js | 3 KB | — | ✓ | 3rd |
| https://top-fwz1.mail.ru/js/dyn-goal-config.js?ids=84394 | 2 KB | — | ✓ | 3rd |
| https://im2.kommersant.ru/ContentFlex/Redesign2020/kom2021.lazyChunks/pushPopup_desktop~lazyChunks/pushPopup_mobile-9cf852ebbec6e29c1767.js | 5 KB | — | ✓ | 3rd |
| https://top-fwz1.mail.ru/js/code.js | 20 KB | — | ✓ | 3rd |
| https://iv.kommersant.ru/ContentFlex/Redesign2020/kom2021.main.js?2604171836405549 | 15 KB | — | ✓ | 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
BPage Weight Inventory78 resources · 1.2 MB · 247 KB savings availableREVIEW
~247.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 78 resources | 1.2 MiB | ||||||
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 (147 KB)PASS
Web fonts
3
147 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 Waterfall78 requests over 6528msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.kommersant.ru www.kommersant.ru | Other | 252ms | 62 KB | — | ₽75/mo | Costly |
yandex.ru yandex.ru | Other | 239ms | 105 KB | 51% | ₽71/mo | Costly |
top-fwz1.mail.ru top-fwz1.mail.ru | Other | 136ms | 20 KB | — | ₽40/mo | Optional |
Unattributable Unattributable | Other | 114ms | 0 KB | — | ₽34/mo | Optional |
iv.kommersant.ru iv.kommersant.ru | Other | 114ms | 46 KB | — | ₽34/mo | Optional |
privacy-cs.mail.ru privacy-cs.mail.ru | Other | 92ms | 22 KB | — | ₽27/mo | Optional |
mc.yandex.ru mc.yandex.ru | Other | 70ms | 85 KB | 51% | ₽21/mo | Optional |
iv.kommersant.ru iv.kommersant.ru | Other | 54ms | 67 KB | 39% | ₽16/mo | Optional |
These scripts may cost more than they're worth
- www.kommersant.ru adds 252ms and costs ~₽75/month
- yandex.ru adds 239ms and costs ~₽71/month
100% 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
www.kommersant.ru takes 252ms 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
yandex.ru takes 239ms 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
51% of 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
51% 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