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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
2
REVIEW
2
PASS
11
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
57
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
84
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

6.23 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

6.59 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

251 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

6.23 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.

8.00 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
11 PASS 2 REVIEW 2 FIX
F
JS Bundles
Action
25 scripts, 524 KB unused
FIX
25 scripts, 524 KB unused
Warning::
https://u.to/_nuxt/DzqWC-HI.js: 480 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mc.yandex.ru/metrika/tag.js?id=106536150: 45 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 524 KB
524 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://u.to/_nuxt/DzqWC-HI.js610 KB480 KB (79%)✓1st
https://mc.yandex.ru/metrika/tag.js?id=10653615089 KB45 KB (50%)✓3rd
https://u.to/_nuxt/Bni7g80c.js7 KB—✓1st
https://u.to/_nuxt/CkfYKsaV.js59 KB—✓1st
https://u.to/_nuxt/Cm7oWuZy.js1 KB—✓1st
https://u.to/_nuxt/Ok02pQeQ.js1 KB—✓1st
https://u.to/_nuxt/CITq_Vo_.js1 KB—✓1st
https://u.to/_nuxt/CK91cqZD.js0 KB—✓1st
https://u.to/_nuxt/YccofjTJ.js2 KB—✓1st
https://u.to/_nuxt/dQ1_tKGD.js5 KB—✓1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

D
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
JS Execution Cost
Action
1310ms total JS execution
REVIEW
1310ms total JS execution
Warning::
Unattributable: 425ms CPU time
Warning::
https://u.to/_nuxt/DzqWC-HI.js: 417ms CPU time
Warning::
https://u.to/: 307ms CPU time
Info::
https://mc.yandex.ru/metrika/tag.js?id=106536150: 161ms CPU time
Info::
Third-party scripts: 586ms (45% of total)

Main Thread Breakdown

Script Evaluation 57% Other 34% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
Unattributable425ms103ms0ms3rd
https://u.to/_nuxt/DzqWC-HI.js417ms361ms9ms1st
https://u.to/307ms184ms2ms1st
https://mc.yandex.ru/metrika/tag.js?id=106536150161ms138ms18ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
983 KB transferred, 50 requests
PASS
983 KB transferred, 50 requests
Info::
Page weighs 2.8 MB (983 KB transferred)
Warning::
JavaScript is 826 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 826 KB
Info::
50 HTTP requests
Info::
Estimated 0.20 g CO2 per page load
983 KB / 2.4 MB budget
983 KB transferred
50 requests
0.20 g CO2 per page load
JavaScript 826.1 KiB 84%
CSS 74.6 KiB 8%
Fonts 71.3 KiB 7%
Other 6.7 KiB 1%
HTML 1.6 KiB 0%
Other 1.5 KiB 0%
Other 868 B 0%
Images 482 B 0%
0 2.4 MB 4.9 MB
Under budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

A+
Third-Party Impact
17% third-party, 0 ms blocking
PASS
17% third-party, 0 ms blocking
Info::
Third-party code accounts for 17% of page weight (168.0 KiB of 983.2 KiB)
Info::
Third-party blocking time is low (0 ms)
83%
17%
First-party Third-party
A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A
Image Optimization
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 0 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (71 KB)
PASS
1 fonts (71 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

71 KB total

Render-blocking

0

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 6.2 s LCP 6.6 shttps://fonts.gstatic.com/s/inter/v20/UcCo3FwrK3iLTcviYwYZ8UA3.woff2UcCo3FwrK3iLTcviYwYZ8UA... https://fonts.gstatic.com/s/inter/v20/UcCo3FwrK3iLTcviYwYZ8UA3.woff2 — 71.3 KiB — 64 ms — font-display: swap
UcCo3FwrK3iLTcviYwYZ8UA... woff2 swap
Size 71 KB
Load time 64 ms
Start 974 ms
Risk FOUT — text flashes from fallback to web font
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 Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
Page Weight Inventory
50 resources · 983 KB · 524 KB savings available
PASS
50 resources · 983 KB · 524 KB savings available
Info::
Within 1MB page-weight target
Got: 983 KB
Info::
~524 KB of savings available
Info::
12 third-party resources (17% of weight)
Info::
1 resources over 200KB
50 resources · 983.2 KiB · 12 third-party Within 1MB page-weight target
JavaScript 84% · 826.1 KiB
CSS 8% · 74.6 KiB
Font 7% · 71.3 KiB
Other 1% · 5.5 KiB
Image 0% · 4.1 KiB
Document 0% · 1.6 KiB

~524.2 KiB of savings available

Remove unused JavaScript: 524.2 KiB
A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
50 requests over 1988ms
INFO
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0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 6.2 s LCP 6.6 shttps://u.to// https://u.to/ — 200 — 1.6 KiB — 142 ms — h2https://u.to/_nuxt/entry.D5D54_Ij.css/_nuxt/entry.D5D54_Ij.css https://u.to/_nuxt/entry.D5D54_Ij.css — 200 — 67.9 KiB — 109 ms — h2https://u.to/_nuxt/DzqWC-HI.js/_nuxt/DzqWC-HI.js https://u.to/_nuxt/DzqWC-HI.js — 200 — 610.0 KiB — 196 ms — h2https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,100..700;1,100..700&family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Sofia+Sans+Condensed:ital,wght@0,1..1000;1,1..1000&display=swap&family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swapfonts.googleapis.com/css2?family=IB... https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:ital,wght@0,100..700;1,100..700&family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Sofia+Sans+Condensed:ital,wght@0,1..1000;1,1..1000&display=swap&family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap — 200 — 2.8 KiB — 117 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
45% of JavaScript execution is third-party
First-party Third-party 586ms · 89KB · د.إ23/mo
Unattributable
Other
Costly
Execution 425ms
Transfer 0 KB
Monthly Cost د.إ17/mo
mc.yandex.ru
Other
Optional
Execution 161ms
Transfer 89 KB
Unused 50%
Monthly Cost د.إ6/mo

These scripts may cost more than they're worth

  • Unattributable adds 425ms and costs ~د.إ17/month

45% of JavaScript execution time comes from third-party scripts.

Why this matters

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

Unattributable takes 425ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

50% of mc.yandex.ru's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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