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Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
1
REVIEW
4
PASS
18
INFO
3

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

Mobile Desktop
84
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.14 s

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

2.94 s

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

415 ms

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

0.001

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

2.60 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.

7.42 s

Page Load Progression

580 ms
1.2 s
1.7 s
2.3 s
2.9 s
3.5 s
4.1 s
4.6 s
Checks
26
18 PASS 4 REVIEW 1 FIX
D
JS Execution Cost
Action
2683ms total JS execution
FIX
2683ms total JS execution
Warning::
https://cleanpasteai.com/: 870ms CPU time
Warning::
https://cleanpasteai.com/_next/static/chunks/2aqhk...: 761ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-247Y...: 297ms CPU time
Warning::
Unattributable: 284ms CPU time
Warning::
https://scripts.clarity.ms/0.8.69/clarity.js: 278ms CPU time
Info::
Third-party scripts: 639ms (24% of total)

Main Thread Breakdown

Script Evaluation 50% Other 22% Style & Layout 12% Rendering 9% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://cleanpasteai.com/870ms12ms9ms1st
https://cleanpasteai.com/_next/static/chunks/2aqhk1adku7v0.js761ms694ms15ms1st
https://www.googletagmanager.com/gtag/js?id=G-247YXHPLQC297ms247ms47ms3rd
Unattributable284ms29ms0ms1st
https://scripts.clarity.ms/0.8.69/clarity.js278ms236ms8ms3rd
https://cleanpasteai.com/_next/static/chunks/2eqj4whya9ga8.js130ms76ms13ms1st
https://accounts.google.com/gsi/client64ms46ms19ms3rd
B
Third-Party Impact
40% third-party, 0 ms blocking
REVIEW
40% third-party, 0 ms blocking
Info::
Third-party code accounts for 40% of page weight (303.9 KiB of 752.4 KiB)
Info::
Third-party blocking time is low (0 ms)
60%
40%
First-party Third-party
C
JS Bundles
Action
22 scripts, 172 KB unused
REVIEW
22 scripts, 172 KB unused
Warning::
https://accounts.google.com/gsi/client: 74 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-247Y...: 72 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cleanpasteai.com/_next/static/chunks/2aqhk...: 26 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 172 KB
172 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://accounts.google.com/gsi/client99 KB74 KB (75%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-247YXHPLQC170 KB72 KB (43%)✓3rd
https://cleanpasteai.com/_next/static/chunks/2aqhk1adku7v0.js72 KB26 KB (36%)✓1st
https://cleanpasteai.com/_next/static/chunks/1m5svuvq1q21c.js14 KB—✓1st
https://cleanpasteai.com/_next/static/chunks/2e6zz9b57s2pz.js11 KB—✓1st
https://cleanpasteai.com/_next/static/chunks/3pz4b71rk2f-k.js5 KB—✓1st
https://cleanpasteai.com/_next/static/chunks/2w-ta70g2m3sw.js14 KB—✓1st
https://cleanpasteai.com/_next/static/chunks/2lypw1h09pryc.js14 KB—✓1st
https://cleanpasteai.com/_next/static/chunks/15148gk_upur8.js1 KB—✓1st
https://cleanpasteai.com/_next/static/chunks/09d0pr9akotop.js11 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

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

B
Server-Timing Observability
No Server-Timing header found
REVIEW
No Server-Timing header found
Info::
No Server-Timing header found
Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.
B
HTTP Caching
public, max-age=0, must-revalidate
REVIEW
public, max-age=0, must-revalidate
Info::
Cache-Control header is set
Got: public, max-age=0, must-revalidate
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

public, max-age=0, must-revalidate

DirectiveValueMeaning
public—Any cache may store this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
A
Page Weight Budget
752 KB transferred, 57 requests
PASS
752 KB transferred, 57 requests
Info::
Page weighs 2.0 MB (752 KB transferred)
Warning::
JavaScript is 549 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 549 KB
Info::
57 HTTP requests
Info::
Estimated 0.15 g CO2 per page load
752 KB / 2.4 MB budget
752 KB transferred
57 requests
0.15 g CO2 per page load
JavaScript 548.9 KiB 73%
Fonts 74.7 KiB 10%
Other 38.3 KiB 5%
HTML 36.0 KiB 5%
Images 22.5 KiB 3%
Other 16.4 KiB 2%
CSS 14.3 KiB 2%
Other 1.0 KiB 0%
Other 307 B 0%
Other 0 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+
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
1 images, 0 KB saveable
PASS
1 images, 0 KB saveable
Info::
All images are well-optimized
1 images 22 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
2 fonts (75 KB)
PASS
2 fonts (75 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

75 KB total

Render-blocking

0

of 2

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 FCP 1.1 s LCP 2.9 shttps://cleanpasteai.com/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff283afe278b6a6bb3c-s.p.2b... https://cleanpasteai.com/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff2 — 47.7 KiB — 38 ms — font-display: swaphttps://cleanpasteai.com/_next/static/media/fba5a26ea33df6a3-s.p.18rizl4rsrl42.woff2fba5a26ea33df6a3-s.p.18... https://cleanpasteai.com/_next/static/media/fba5a26ea33df6a3-s.p.18rizl4rsrl42.woff2 — 27.0 KiB — 53 ms — font-display: swap
83afe278b6a6bb3c-s.p.2b... woff2 swap
Size 48 KB
Load time 38 ms
Start 213 ms
Risk FOUT — text flashes from fallback to web font
fba5a26ea33df6a3-s.p.18... woff2 swap
Size 27 KB
Load time 53 ms
Start 214 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
3 hints, 0 missing preconnects
PASS
3 hints, 0 missing preconnects
Info::
Page uses 3 resource hint(s)

Current Resource Hints

preconnect
—
preload
3
dns-prefetch
—
prefetch
—

3 resource hints configured

A+
HTTP/3 (QUIC)
HTTP/3 advertised via Alt-Svc
PASS
HTTP/3 advertised via Alt-Svc
Info::
HTTP/3 (QUIC) is supported
First-load mobile users on cellular networks see meaningful latency improvements with HTTP/3. The QUIC transport collapses TLS + TCP handshakes into one and recovers faster from packet loss.
A+
Compression Algorithm
Main response uses brotli
PASS
Main response uses brotli
Info::
Main HTML response uses brotli (Content-Encoding: br)
Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.
A+
LCP Image Preload
LCP preload audit not available
PASS
LCP preload audit not available
Info::
LCP image preload audit not available for this scan
A+
Main HTML Cache-Control
Main HTML max-age=0 (≤ 5min) is appropriate
PASS
Main HTML max-age=0 (≤ 5min) is appropriate
Info::
Main HTML max-age=0 (≤ 5min) is appropriate
Got: public, max-age=0, must-revalidate
A+
Server Response Intelligence
2 server-response signal(s) detected
PASS
2 server-response signal(s) detected
Info::
`Vary` header declared: rsc, next-router-state-tree, next-router-prefetch, next-router-segment-prefetch
The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).
Info::
No `ETag` or `Last-Modified` -- conditional GET not supported
Without either header, browsers can't issue conditional GETs and refresh always re-downloads the full response body even when nothing changed. Add `ETag: "<hash>"` (or `Last-Modified: <date>`) on cacheable responses; the server returns 304 Not Modified when the client's cached copy is still valid, saving bandwidth.
A
Page Weight Inventory
57 resources · 752 KB · 172 KB savings available
PASS
57 resources · 752 KB · 172 KB savings available
Info::
Within 1MB page-weight target
Got: 752 KB
Info::
~172 KB of savings available
Warning::
15 third-party resources (40% of weight)
57 resources · 752.4 KiB · 15 third-party Within 1MB page-weight target
JavaScript 73% · 548.9 KiB
Font 10% · 74.7 KiB
Other 5% · 39.7 KiB
Image 5% · 38.9 KiB
Document 5% · 36.0 KiB
CSS 2% · 14.3 KiB

~171.6 KiB of savings available

Remove unused JavaScript: 171.6 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
A
JavaScript Blocking
1 JS blocking issue(s) detected
PASS
1 JS blocking issue(s) detected
Warning::
1 render-blocking <script src> tag(s) without async/defer
Each `<script src=...>` without `async`, `defer`, or `type="module"` blocks HTML parsing while the browser fetches and executes it. The block lasts the entire round-trip + execution time -- on slow networks this translates directly into LCP delay. Add `defer` (executes after parse, in source order) for scripts that interact with the DOM, or `async` (executes whenever ready) for analytics / independent scripts. Module scripts (`type="module"`) are deferred by default.
A+
CSS Performance Depth
No CSS performance depth issues detected
PASS
No CSS performance depth issues detected
Info::
No CSS performance depth issues detected
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
57 requests over 2330ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.9 shttps://cleanpasteai.com// https://cleanpasteai.com/ — 200 — 36.0 KiB — 205 ms — h2https://cleanpasteai.com/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff2/_next/static/media/83afe278b6a6bb3... https://cleanpasteai.com/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff2 — 200 — 47.7 KiB — 38 ms — h2https://cleanpasteai.com/_next/static/media/fba5a26ea33df6a3-s.p.18rizl4rsrl42.woff2/_next/static/media/fba5a26ea33df6a... https://cleanpasteai.com/_next/static/media/fba5a26ea33df6a3-s.p.18rizl4rsrl42.woff2 — 200 — 27.0 KiB — 53 ms — h2https://cleanpasteai.com/_next/static/chunks/0bvlei94cyx7c.css/_next/static/chunks/0bvlei94cyx7c.... https://cleanpasteai.com/_next/static/chunks/0bvlei94cyx7c.css — 200 — 14.3 KiB — 46 ms — h2https://cleanpasteai.com/site.webmanifest/site.webmanifest https://cleanpasteai.com/site.webmanifest — 200 — 1.0 KiB — 65 ms — h3https://cleanpasteai.com/_next/static/chunks/3s6nzrbk-8mnv.js/_next/static/chunks/3s6nzrbk-8mnv.... https://cleanpasteai.com/_next/static/chunks/3s6nzrbk-8mnv.js — 200 — 2.7 KiB — 110 ms — h3https://cleanpasteai.com/_next/static/chunks/06tyvpr2z9hzy.js/_next/static/chunks/06tyvpr2z9hzy.... https://cleanpasteai.com/_next/static/chunks/06tyvpr2z9hzy.js — 200 — 8.5 KiB — 136 ms — h3https://cleanpasteai.com/_next/static/chunks/2aqhk1adku7v0.js/_next/static/chunks/2aqhk1adku7v0.... https://cleanpasteai.com/_next/static/chunks/2aqhk1adku7v0.js — 200 — 72.3 KiB — 164 ms — h3https://cleanpasteai.com/_next/static/chunks/2eqj4whya9ga8.js/_next/static/chunks/2eqj4whya9ga8.... https://cleanpasteai.com/_next/static/chunks/2eqj4whya9ga8.js — 200 — 45.1 KiB — 160 ms — h3https://cleanpasteai.com/_next/static/chunks/turbopack-24y2yt21lq0u5.js/_next/static/chunks/turbopack-24y2... https://cleanpasteai.com/_next/static/chunks/turbopack-24y2yt21lq0u5.js — 200 — 5.1 KiB — 121 ms — h3https://cleanpasteai.com/_next/static/chunks/3pz4b71rk2f-k.js/_next/static/chunks/3pz4b71rk2f-k.... https://cleanpasteai.com/_next/static/chunks/3pz4b71rk2f-k.js — 200 — 4.6 KiB — 127 ms — h3https://cleanpasteai.com/_next/static/chunks/2w-ta70g2m3sw.js/_next/static/chunks/2w-ta70g2m3sw.... https://cleanpasteai.com/_next/static/chunks/2w-ta70g2m3sw.js — 200 — 14.1 KiB — 144 ms — h3https://cleanpasteai.com/_next/static/chunks/2lypw1h09pryc.js/_next/static/chunks/2lypw1h09pryc.... https://cleanpasteai.com/_next/static/chunks/2lypw1h09pryc.js — 200 — 14.0 KiB — 143 ms — h3https://cleanpasteai.com/_next/static/chunks/15148gk_upur8.js/_next/static/chunks/15148gk_upur8.... https://cleanpasteai.com/_next/static/chunks/15148gk_upur8.js — 200 — 825 B — 96 ms — h3https://cleanpasteai.com/_next/static/chunks/09d0pr9akotop.js/_next/static/chunks/09d0pr9akotop.... https://cleanpasteai.com/_next/static/chunks/09d0pr9akotop.js — 200 — 10.6 KiB — 139 ms — h3https://cleanpasteai.com/_next/static/chunks/1m5svuvq1q21c.js/_next/static/chunks/1m5svuvq1q21c.... https://cleanpasteai.com/_next/static/chunks/1m5svuvq1q21c.js — 200 — 13.7 KiB — 146 ms — h3https://cleanpasteai.com/_next/static/chunks/1sk7wt5784sv_.js/_next/static/chunks/1sk7wt5784sv_.... https://cleanpasteai.com/_next/static/chunks/1sk7wt5784sv_.js — 200 — 35.6 KiB — 158 ms — h3https://cleanpasteai.com/_next/static/chunks/2e6zz9b57s2pz.js/_next/static/chunks/2e6zz9b57s2pz.... https://cleanpasteai.com/_next/static/chunks/2e6zz9b57s2pz.js — 200 — 11.4 KiB — 143 ms — h3https://cleanpasteai.com/_next/static/chunks/0p8jtonlhswc2.js/_next/static/chunks/0p8jtonlhswc2.... https://cleanpasteai.com/_next/static/chunks/0p8jtonlhswc2.js — 200 — 9.6 KiB — 142 ms — h3https://cleanpasteai.com/images/demo-before-after.webp/images/demo-before-after.webp https://cleanpasteai.com/images/demo-before-after.webp — 200 — 22.5 KiB — 95 ms — h3https://cleanpasteai.com/favicon.ico/favicon.ico https://cleanpasteai.com/favicon.ico — 200 — 6.0 KiB — 40 ms — h3https://cleanpasteai.com/api/auth/get-session/api/auth/get-session https://cleanpasteai.com/api/auth/get-session — 200 — 1.4 KiB — 53 ms — h3https://cleanpasteai.com/android-chrome-192x192.png/android-chrome-192x192.png https://cleanpasteai.com/android-chrome-192x192.png — 200 — 10.4 KiB — 40 ms — h3https://cleanpasteai.com/api/billing/me/api/billing/me https://cleanpasteai.com/api/billing/me — 200 — 1.4 KiB — 38 ms — h3https://cleanpasteai.com/pricing?_rsc=ry-B8umWgNEV4JR9/pricing?_rsc=ry-B8umWgNEV4JR9 https://cleanpasteai.com/pricing?_rsc=ry-B8umWgNEV4JR9 — 200 — 1.6 KiB — 38 ms — h3https://cleanpasteai.com/clean-paste?_rsc=ry-B8umWgNEV4JR9/clean-paste?_rsc=ry-B8umWgNEV4JR9 https://cleanpasteai.com/clean-paste?_rsc=ry-B8umWgNEV4JR9 — 200 — 1.6 KiB — 718 ms — h3https://cleanpasteai.com/paste-clean?_rsc=ry-B8umWgNEV4JR9/paste-clean?_rsc=ry-B8umWgNEV4JR9 https://cleanpasteai.com/paste-clean?_rsc=ry-B8umWgNEV4JR9 — 200 — 1.6 KiB — 728 ms — h3https://cleanpasteai.com/clean-text?_rsc=ry-B8umWgNEV4JR9/clean-text?_rsc=ry-B8umWgNEV4JR9 https://cleanpasteai.com/clean-text?_rsc=ry-B8umWgNEV4JR9 — 200 — 1.6 KiB — 655 ms — h3https://cleanpasteai.com/api/config/public/api/config/public https://cleanpasteai.com/api/config/public — 200 — 1.5 KiB — 752 ms — h3https://www.googletagmanager.com/gtag/js?id=G-247YXHPLQCwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-247YXHPLQC — 200 — 169.7 KiB — 259 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.9 shttps://cleanpasteai.com// https://cleanpasteai.com/ — 200 — 36.0 KiB — 205 ms — h2https://cleanpasteai.com/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff2/_next/static/media/83afe278b6a6bb3... https://cleanpasteai.com/_next/static/media/83afe278b6a6bb3c-s.p.2bn3s6zvc0dyp.woff2 — 200 — 47.7 KiB — 38 ms — h2https://cleanpasteai.com/_next/static/media/fba5a26ea33df6a3-s.p.18rizl4rsrl42.woff2/_next/static/media/fba5a26ea33df6a... https://cleanpasteai.com/_next/static/media/fba5a26ea33df6a3-s.p.18rizl4rsrl42.woff2 — 200 — 27.0 KiB — 53 ms — h2https://cleanpasteai.com/_next/static/chunks/0bvlei94cyx7c.css/_next/static/chunks/0bvlei94cyx7c.... https://cleanpasteai.com/_next/static/chunks/0bvlei94cyx7c.css — 200 — 14.3 KiB — 46 ms — h2https://cleanpasteai.com/site.webmanifest/site.webmanifest https://cleanpasteai.com/site.webmanifest — 200 — 1.0 KiB — 65 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
24% of JavaScript execution is third-party
First-party Third-party 639ms · 294KB · €7/mo
Google Tag Manager
Tag Manager
Costly
Execution 297ms
Transfer 170 KB
Unused 43%
Monthly Cost €3/mo
Microsoft Clarity
Session Replay
Costly
Execution 278ms
Transfer 25 KB
Monthly Cost €3/mo
accounts.google.com
Other
Optional
Execution 64ms
Transfer 99 KB
Unused 75%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 297ms and costs ~€3/month
  • Microsoft Clarity adds 278ms and costs ~€3/month

Google Tag Manager takes 297ms 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

Microsoft Clarity takes 278ms 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

75% of accounts.google.com'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

Image Optimization
38 images, 22 KB total, 17 KB wasted
INFO

Image Optimization Audit

Total Images

38

Total Size

22 KB

Oversized

1

Wasted

17 KB

9 missing dimensions
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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