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.
3.02 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
5.99 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
184 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.005
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.02 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.
6.66 s
Page Load Progression
DThird-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.
CImage OptimizationAction17 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
CJS Execution CostAction1574ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 332ms | 66ms | 0ms | 3rd |
| https://top-fwz1.mail.ru/js/code.js | 315ms | 279ms | 4ms | 3rd |
| https://privacy-cs.mail.ru/static/sync-loader.js | 270ms | 233ms | 6ms | 3rd |
| https://mc.yandex.ru/metrika/watch.js | 176ms | 152ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9Z49MNPZRL&cx=c&_slc=1 | 172ms | 134ms | 37ms | 3rd |
| https://apiok.ru/ext/ | 161ms | 7ms | 2ms | 3rd |
| https://apiok.ru/assets/app.js | 95ms | 60ms | 13ms | 3rd |
| https://www.google-analytics.com/analytics.js | 54ms | 44ms | 4ms | 3rd |
BJS Bundles7 scripts, 122 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-9Z49MNPZRL&cx=c&_slc=1 | 146 KB | 64 KB (44%) | ✓ | 3rd |
| https://mc.yandex.ru/metrika/watch.js | 69 KB | 30 KB (44%) | ✓ | 3rd |
| https://apiok.ru/assets/app.js | 44 KB | 28 KB (65%) | ✗ | 3rd |
| https://top-fwz1.mail.ru/js/code.js | 20 KB | — | ✓ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 KB | — | ✓ | 3rd |
| https://privacy-cs.mail.ru/static/sync-loader.js | 22 KB | — | ✓ | 3rd |
| https://top-fwz1.mail.ru/js/dyn-goal-config.js?ids=2794822 | 2 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Page Weight Budget624 KB transferred, 42 requestsPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading1 fonts (136 KB)PASS
Web fonts
1
136 KB total
Render-blocking
0
of 1
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)
Fixing the unchecked items could save ~108 KB and ~216 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
APage Weight Inventory42 resources · 624 KB · 122 KB savings availablePASS
~122.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 42 resources | 623.9 KiB | ||||||
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall42 requests over 2515msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 332ms | 0 KB | — | ₽98/mo | Costly |
top-fwz1.mail.ru top-fwz1.mail.ru | Other | 315ms | 20 KB | — | ₽93/mo | Costly |
privacy-cs.mail.ru privacy-cs.mail.ru | Other | 270ms | 22 KB | — | ₽80/mo | Costly |
mc.yandex.ru mc.yandex.ru | Other | 176ms | 69 KB | 44% | ₽52/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 172ms | 146 KB | 44% | ₽51/mo | Costly |
apiok.ru apiok.ru | Other | 161ms | 3 KB | — | ₽48/mo | Optional |
apiok.ru apiok.ru | Other | 95ms | 44 KB | 65% | ₽28/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 54ms | 21 KB | — | ₽16/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 332ms and costs ~₽98/month
- top-fwz1.mail.ru adds 315ms and costs ~₽93/month
- privacy-cs.mail.ru adds 270ms and costs ~₽80/month
- mc.yandex.ru adds 176ms and costs ~₽52/month
- Google Tag Manager adds 172ms and costs ~₽51/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
Unattributable takes 332ms 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
top-fwz1.mail.ru takes 315ms 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
privacy-cs.mail.ru takes 270ms 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 176ms 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
Google Tag Manager takes 172ms 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
65% of apiok.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