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.
1.02 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.44 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
181 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.
3.72 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.
6.13 s
Page Load Progression
1.4 s
2.7 s
4.1 s 5.4 s
6.8 s 8.1 s
9.5 s
10.8 sDPage Weight BudgetAction2.1 MB transferred, 438 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
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 ImpactAction98% third-party, 0 ms blockingFIX
FJS Execution CostAction8316ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://lenta.ru/ | 4136ms | 13ms | 2ms | 1st |
| https://icdn.lenta.ru/assets/webpack/vendorsOwl.67124b15.js | 1823ms | 461ms | 13ms | 3rd |
| Unattributable | 559ms | 97ms | 0ms | 3rd |
| https://ssp.rambler.ru/capirs_async.js | 461ms | 397ms | 14ms | 3rd |
| https://cdn-s01.rambler.ru/magic/v1.3.6/magic.js | 361ms | 15ms | 4ms | 3rd |
| https://yandex.ru/ads/system/context.js | 250ms | 182ms | 12ms | 3rd |
| https://st.top100.ru/top100/top100.js | 204ms | 183ms | 13ms | 3rd |
| https://icdn.lenta.ru/assets/webpack/owlBundle.67124b15.js | 101ms | 87ms | 12ms | 3rd |
| https://privacy-cs.mail.ru/static/sync-loader.js | 91ms | 79ms | 3ms | 3rd |
| https://yastatic.net/partner-code-bundles/1304651/22d10f9d8e892aab.js | 88ms | 53ms | 7ms | 3rd |
Showing top 10 of 13 scripts
DJS BundlesAction28 scripts, 414 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://icdn.lenta.ru/assets/webpack/vendorsOwl.67124b15.js | 139 KB | 102 KB (73%) | ✓ | 3rd |
| https://yastatic.net/partner-code-bundles/1304651/00cc0164cd639ddf.js | 130 KB | 79 KB (61%) | ✓ | 3rd |
| https://yandex.ru/ads/system/context.js | 105 KB | 47 KB (45%) | ✓ | 3rd |
| https://mc.webvisor.org/metrika/tag_ww.js | 86 KB | 42 KB (50%) | ✓ | 3rd |
| https://ssp.rambler.ru/capirs_async.js | 89 KB | 36 KB (41%) | ✓ | 3rd |
| https://icdn.lenta.ru/assets/webpack/owlBundle.67124b15.js | 173 KB | 32 KB (19%) | ✓ | 3rd |
| https://st.top100.ru/top100/top100.js | 37 KB | 27 KB (74%) | ✓ | 3rd |
| https://yastatic.net/partner-code-bundles/1304651/e98eb32840226dc3.js | 58 KB | 25 KB (44%) | ✓ | 3rd |
| https://yastatic.net/partner-code-bundles/1304651/22d10f9d8e892aab.js | 32 KB | 23 KB (71%) | ✓ | 3rd |
| https://ssp01.rambler.ru/context.jsp?pad_id=432172862&block_id=432172880&screenw=800&screenh=600&winw=1350&winh=940&rq=0&rq_type=0&rq_sess=D37A4A2EEF75A43A630351FDB27AE297&adtech_uid=6c9522ec-5c3e-48a3-8420-55b302f71eaa&adtech_uid_scope=lenta.ru&publisher_uid=vAsAAAT352lE9T2tARogVwB%3D&publisher_uid_scope=.lenta.ru&jparams=%7B%22p1%22%3A%22bmdxy%22%2C%22p2%22%3A%22ewtq%22%2C%22pct%22%3A%22a%22%2C%22puid6%22%3A%22LENTA_HOMEPAGE%22%2C%22puid18%22%3A%22LENTA_0%22%2C%22puid15%22%3Anull%2C%22puid26%22%3Anull%2C%22puid48%22%3Anull%2C%22pageNumber%22%3A%221%22%2C%22puid42%22%3A%220%22%2C%22pli%22%3A%22a%22%2C%22plp%22%3A%22a%22%2C%22pop%22%3A%22a%22%7D&top=1197&left=975&secure=1&vcapirs=38_57_6&top100_session_id=%7B%7D&callback=Begun_Autocontext_saveFeed6&url=https%3A%2F%2Flenta.ru%2F | 4 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
FPage Weight InventoryAction438 resources · 2.1 MB · 414 KB savings availableFIX
~413.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 438 resources | 2.1 MiB | ||||||
BImage Optimization158 images, 0 KB saveableREVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmax-age=0, private, must-revalidateREVIEW
max-age=0, private, must-revalidate
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
| private | — | Only browser cache, not CDN/proxy |
| must-revalidate | — | Must recheck with server after expiry |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading4 fonts (166 KB)PASS
Web fonts
4
166 KB total
Render-blocking
0
of 4
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 Waterfall438 requests over 19396msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
icdn.lenta.ru icdn.lenta.ru | Other | 1823ms | 139 KB | 73% | ₽540/mo | Costly |
Unattributable Unattributable | Other | 559ms | 0 KB | — | ₽165/mo | Costly |
ssp.rambler.ru ssp.rambler.ru | Other | 461ms | 89 KB | 41% | ₽136/mo | Costly |
cdn-s01.rambler.ru cdn-s01.rambler.ru | Other | 361ms | 43 KB | — | ₽107/mo | Costly |
yandex.ru yandex.ru | Other | 250ms | 105 KB | 45% | ₽74/mo | Costly |
st.top100.ru st.top100.ru | Other | 204ms | 37 KB | 74% | ₽60/mo | Costly |
icdn.lenta.ru icdn.lenta.ru | Other | 101ms | 173 KB | 19% | ₽30/mo | Optional |
privacy-cs.mail.ru privacy-cs.mail.ru | Other | 91ms | 22 KB | — | ₽27/mo | Optional |
yastatic.net yastatic.net | Other | 88ms | 32 KB | 71% | ₽26/mo | Optional |
vp.rambler.ru vp.rambler.ru | Other | 88ms | 18 KB | — | ₽26/mo | Optional |
yastatic.net yastatic.net | Other | 77ms | 58 KB | 44% | ₽23/mo | Optional |
mc.webvisor.org mc.webvisor.org | Other | 76ms | 86 KB | 50% | ₽23/mo | Optional |
These scripts may cost more than they're worth
- icdn.lenta.ru adds 1823ms and costs ~₽540/month
- Unattributable adds 559ms and costs ~₽165/month
- ssp.rambler.ru adds 461ms and costs ~₽136/month
- cdn-s01.rambler.ru adds 361ms and costs ~₽107/month
- yandex.ru adds 250ms and costs ~₽74/month
- st.top100.ru adds 204ms and costs ~₽60/month
50% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac
icdn.lenta.ru takes 1823ms 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
73% of icdn.lenta.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
Unattributable takes 559ms 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
ssp.rambler.ru takes 461ms 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-s01.rambler.ru takes 361ms 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 250ms 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
st.top100.ru takes 204ms 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
74% of st.top100.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
71% 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