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.
5.66 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
25.06 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.67 s
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.
11.46 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.
26.75 s
Page Load Progression
FPage Weight BudgetAction4.7 MB transferred, 159 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
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 ImpactAction97% third-party, 0 ms blockingFIX
FJS Execution CostAction9072ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://static.dzeninfra.ru/s3/zen-apps/dzen-mobile/1.858.0/dzen-mobile-second.modern.bundle.js | 2496ms | 2105ms | 162ms | 3rd |
| https://dzen.ru/?yredirect=true&is_autologin_ya=true | 1413ms | 6ms | 5ms | 3rd |
| Unattributable | 1118ms | 64ms | 0ms | 3rd |
| https://static.dzeninfra.ru/s3/zen-apps/dzen-layout/1.128.1/dzen-layout-mobile.modern.bundle.js | 625ms | 504ms | 65ms | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 483ms | 411ms | 31ms | 3rd |
| https://dzen.ru/?yredirect=true | 460ms | 88ms | 119ms | 3rd |
| https://yastatic.net/partner-code-bundles/1304600/bbdb1c88f62458f5.js | 444ms | 317ms | 20ms | 3rd |
| https://yandex.ru/ads/system/context.js?pcode-test-ids=1387855%2C0%2C43%3B1508550%2C0%2C62%3B1479497%2C0%2C96%3B1516756%2C0%2C88%3B1528386%2C0%2C3%3B1525395%2C0%2C72%3B1534007%2C0%2C72%3B1538641%2C0%2C49%3B1538335%2C0%2C12%3B1513557%2C0%2C33%3B1525993%2C0%2C29%3B1533854%2C0%2C21%3B1524838%2C0%2C73%3B1540936%2C0%2C15%3B1485712%2C0%2C45%3B1522210%2C0%2C54%3B1534167%2C0%2C85%3B1513550%2C0%2C97%3B912262%2C0%2C66&pcode-flags-map=eJyFlWGP2jgQhv9LPq8qO7GTmG8mNsEi2KntQLmqGtEu1UmH9qqWnu5U7X-_SbJHL6wa9gOLQubxzLzvjH8kBxnaEOWy0Tvtk8X7H8lfx_P3U7JI6JuSijc0EzRLHpLL6dvFPPaPOUspY8nzh4dkJwOMwYDRwTg7JWSE5mU-ic5YwXh5jW5cDZWzUdsIqvMyIgNa7St8MGVNKWlB8nSgKBOGBJQO0bsD6HdReysbqLxG3E6DVNAF7aFqXNCAdd6gT39_mcAZE2nBk-eHO6-k1yq8rmRTdY2MGr-_7TAV2Oq4dgpWzsPeyxZrgs438wdzwhkfqG89LBtZbaAxyKoa0zfIqDDtCRFpVgrGF2VZFGlKySIjAhtDcr6gyGK54OUioyIXRc4z_JVRkmYkWwhBGSG8WFBKCKXYTnytxGd50b9GU0LKlCKEEca4SBdZik1nZTn1AiuQR4eMpVJgtrLWUMum0f4AxoLVnXe9NKa286Wj1wj7D2RsDf2_3g2oZCu9xHaiw4Z2ouLRm2UXb_32GpoLUc4L2b8ynqvt4KPW66VRaEajZuGclEKMYqG7IPSy22gw3cah4-QofdiYFqLb6PlMOc2yklz9tOrrhd40VsHOKO0gNC4iCJTbzpMyRrPymlaUvtYRTbkaW4fNrJzS9xHFDAJTvA_IB0CtrfbYE1QMh6M-wN7ENbhWViYeJpDPx_P54_HTH_Dn0_mfm4VDKRUDbkj-zsphOSG3CysVxf81xmy03L50dq-XLqSElrDL7pVFyM--2JftEqOs1hDWUrn9nfgyZ-OwqNACjoTzGpYbCOY3PVpbKtn21HucLONXzmCx1gXzah4uX49P374cv56eLrdu43wsZGXeoSQWUwfrXNurNUF8upynoSkXIhtCA56NTkBnbFtAo1bS35kY9DgfZ60XIGLXtloZeedAVr74GdcAtn20gLErhx84EOOKwTtkZepbBR9Pn4_fzzfFMyJezDkCw9obu4G-E70QEFyH1898JT8Za5xSY3XAi7DzO41br7pR4ffj0-PNzuEFHS8PL7H1W5Ah4ITttanX81cTT_st_6tQlKPpJplz0v_9grDqmibgLakthOBhraXCS6pW83rgbOfF1HxutcIkptP8ETh5bbr-4Od_AT6baiM, | 428ms | 353ms | 28ms | 1st |
| https://static.dzeninfra.ru/s3/zen-apps/dzen-mobile/1.858.0/dzen-mobile-first.modern.bundle.js | 326ms | 228ms | 29ms | 3rd |
| https://suggest.sso.dzen.ru/portal/dzensearch/touch?yu=7164686161776358870&clid=&theme=light | 282ms | 160ms | 34ms | 3rd |
Showing top 10 of 16 scripts
FJS BundlesAction27 scripts, 754 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://static.dzeninfra.ru/s3/zen-apps/dzen-mobile/1.858.0/dzen-mobile-second.modern.bundle.js | 594 KB | 219 KB (37%) | ✓ | 3rd |
| https://static.dzeninfra.ru/s3/zen-apps/dzen-layout/1.128.1/dzen-layout-mobile.modern.bundle.js | 268 KB | 107 KB (40%) | ✓ | 3rd |
| https://yastatic.net/partner-code-bundles/1304600/24ec1381af6bc52b.js | 130 KB | 93 KB (72%) | ✓ | 3rd |
| https://static.dzeninfra.ru/s3/zen-apps/dzen-mobile/1.858.0/dzen-mobile-short-video-carousel.modern.bundle.js | 167 KB | 71 KB (43%) | ✓ | 3rd |
| https://mc.yandex.ru/metrika/tag.js | 89 KB | 50 KB (56%) | ✓ | 3rd |
| https://yandex.ru/ads/system/context.js?pcode-test-ids=1387855%2C0%2C43%3B1508550%2C0%2C62%3B1479497%2C0%2C96%3B1516756%2C0%2C88%3B1528386%2C0%2C3%3B1525395%2C0%2C72%3B1534007%2C0%2C72%3B1538641%2C0%2C49%3B1538335%2C0%2C12%3B1513557%2C0%2C33%3B1525993%2C0%2C29%3B1533854%2C0%2C21%3B1524838%2C0%2C73%3B1540936%2C0%2C15%3B1485712%2C0%2C45%3B1522210%2C0%2C54%3B1534167%2C0%2C85%3B1513550%2C0%2C97%3B912262%2C0%2C66&pcode-flags-map=eJyFlWGP2jgQhv9LPq8qO7GTmG8mNsEi2KntQLmqGtEu1UmH9qqWnu5U7X-_SbJHL6wa9gOLQubxzLzvjH8kBxnaEOWy0Tvtk8X7H8lfx_P3U7JI6JuSijc0EzRLHpLL6dvFPPaPOUspY8nzh4dkJwOMwYDRwTg7JWSE5mU-ic5YwXh5jW5cDZWzUdsIqvMyIgNa7St8MGVNKWlB8nSgKBOGBJQO0bsD6HdReysbqLxG3E6DVNAF7aFqXNCAdd6gT39_mcAZE2nBk-eHO6-k1yq8rmRTdY2MGr-_7TAV2Oq4dgpWzsPeyxZrgs438wdzwhkfqG89LBtZbaAxyKoa0zfIqDDtCRFpVgrGF2VZFGlKySIjAhtDcr6gyGK54OUioyIXRc4z_JVRkmYkWwhBGSG8WFBKCKXYTnytxGd50b9GU0LKlCKEEca4SBdZik1nZTn1AiuQR4eMpVJgtrLWUMum0f4AxoLVnXe9NKa286Wj1wj7D2RsDf2_3g2oZCu9xHaiw4Z2ouLRm2UXb_32GpoLUc4L2b8ynqvt4KPW66VRaEajZuGclEKMYqG7IPSy22gw3cah4-QofdiYFqLb6PlMOc2yklz9tOrrhd40VsHOKO0gNC4iCJTbzpMyRrPymlaUvtYRTbkaW4fNrJzS9xHFDAJTvA_IB0CtrfbYE1QMh6M-wN7ENbhWViYeJpDPx_P54_HTH_Dn0_mfm4VDKRUDbkj-zsphOSG3CysVxf81xmy03L50dq-XLqSElrDL7pVFyM--2JftEqOs1hDWUrn9nfgyZ-OwqNACjoTzGpYbCOY3PVpbKtn21HucLONXzmCx1gXzah4uX49P374cv56eLrdu43wsZGXeoSQWUwfrXNurNUF8upynoSkXIhtCA56NTkBnbFtAo1bS35kY9DgfZ60XIGLXtloZeedAVr74GdcAtn20gLErhx84EOOKwTtkZepbBR9Pn4_fzzfFMyJezDkCw9obu4G-E70QEFyH1898JT8Za5xSY3XAi7DzO41br7pR4ffj0-PNzuEFHS8PL7H1W5Ah4ITttanX81cTT_st_6tQlKPpJplz0v_9grDqmibgLakthOBhraXCS6pW83rgbOfF1HxutcIkptP8ETh5bbr-4Od_AT6baiM, | 106 KB | 48 KB (46%) | ✓ | 1st |
| https://static.dzeninfra.ru/react/17.0.2/react-with-dom.min.js | 43 KB | 36 KB (84%) | ✓ | 3rd |
| https://static.dzeninfra.ru/s3/zen-apps/dzen-mobile/1.858.0/dzen-mobile-first.modern.bundle.js | 95 KB | 33 KB (36%) | ✓ | 3rd |
| https://mc.yandex.ru/metrika/watch_zen.js | 54 KB | 28 KB (52%) | ✓ | 3rd |
| https://static.dzeninfra.ru/s3/zen-apps/dzen-mobile/1.858.0/dzen-mobile-article-adapter.modern.bundle.js | 38 KB | 24 KB (65%) | ✓ | 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 InventoryAction159 resources · 4.7 MB · 754 KB savings availableFIX
~754.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 159 resources | 4.7 MiB | ||||||
BImage Optimization40 images, 0 KB saveableREVIEW
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 Loading2 fonts (63 KB)PASS
Web fonts
2
63 KB total
Render-blocking
0
of 2
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 Hints18 hints, 0 missing preconnectsPASS
Current Resource Hints
18 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400,private
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
| private | — | Only browser cache, not CDN/proxy |
Network Waterfall159 requests over 9950msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
static.dzeninfra.ru static.dzeninfra.ru | Other | 2496ms | 594 KB | 37% | ₽739/mo | Costly |
dzen.ru dzen.ru | Other | 1413ms | 318 KB | — | ₽418/mo | Costly |
Unattributable Unattributable | Other | 1118ms | 0 KB | — | ₽331/mo | Costly |
static.dzeninfra.ru static.dzeninfra.ru | Other | 625ms | 268 KB | 40% | ₽185/mo | Costly |
mc.yandex.ru mc.yandex.ru | Other | 483ms | 89 KB | 56% | ₽143/mo | Costly |
dzen.ru dzen.ru | Other | 460ms | 1 KB | — | ₽136/mo | Costly |
yastatic.net yastatic.net | Other | 444ms | 58 KB | 38% | ₽132/mo | Costly |
static.dzeninfra.ru static.dzeninfra.ru | Other | 326ms | 95 KB | 36% | ₽96/mo | Costly |
suggest.sso.dzen.ru suggest.sso.dzen.ru | Other | 282ms | 70 KB | — | ₽83/mo | Costly |
privacy-cs.mail.ru privacy-cs.mail.ru | Other | 275ms | 22 KB | — | ₽81/mo | Costly |
yastatic.net yastatic.net | Other | 247ms | 130 KB | 72% | ₽73/mo | Costly |
yastatic.net yastatic.net | Other | 179ms | 32 KB | 72% | ₽53/mo | Costly |
top-fwz1.mail.ru top-fwz1.mail.ru | Other | 147ms | 20 KB | — | ₽43/mo | Optional |
mc.yandex.ru mc.yandex.ru | Other | 93ms | 54 KB | 52% | ₽28/mo | Optional |
static.dzeninfra.ru static.dzeninfra.ru | Other | 57ms | 167 KB | 43% | ₽17/mo | Optional |
These scripts may cost more than they're worth
- static.dzeninfra.ru adds 2496ms and costs ~₽739/month
- dzen.ru adds 1413ms and costs ~₽418/month
- Unattributable adds 1118ms and costs ~₽331/month
- static.dzeninfra.ru adds 625ms and costs ~₽185/month
- mc.yandex.ru adds 483ms and costs ~₽143/month
- dzen.ru adds 460ms and costs ~₽136/month
- yastatic.net adds 444ms and costs ~₽132/month
- static.dzeninfra.ru adds 326ms and costs ~₽96/month
- suggest.sso.dzen.ru adds 282ms and costs ~₽83/month
- privacy-cs.mail.ru adds 275ms and costs ~₽81/month
- yastatic.net adds 247ms and costs ~₽73/month
- yastatic.net adds 179ms and costs ~₽53/month
95% 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
static.dzeninfra.ru takes 2496ms 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
dzen.ru takes 1413ms 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 1118ms 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
static.dzeninfra.ru takes 625ms 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 483ms 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
56% 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
dzen.ru takes 460ms 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
yastatic.net takes 444ms 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
static.dzeninfra.ru takes 326ms 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
suggest.sso.dzen.ru takes 282ms 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 275ms 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
yastatic.net takes 247ms 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
72% of yastatic.net'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
yastatic.net takes 179ms 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
72% of yastatic.net'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
52% 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