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https://skipupload.com

Performance

· 25 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
93
GRADE
A
FIX
0
REVIEW
6
PASS
17
INFO
2

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

Mobile Desktop
96
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

947 ms

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

2.00 s

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

218 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.

947 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

3.95 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
25
17 PASS 6 REVIEW
B
Third-Party Impact
41% third-party, 0 ms blocking
REVIEW
41% third-party, 0 ms blocking
Info::
Third-party code accounts for 41% of page weight (160.6 KiB of 393.6 KiB)
Info::
Third-party blocking time is low (0 ms)
59%
41%
First-party Third-party
C
JS Execution Cost
Action
1176ms total JS execution
REVIEW
1176ms total JS execution
Warning::
https://skipupload.com/: 321ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-77LW...: 302ms CPU time
Info::
https://skipupload.com/_next/static/chunks/1255-24...: 209ms CPU time
Info::
https://skipupload.com/_next/static/chunks/webpack...: 174ms CPU time
Info::
Unattributable: 170ms CPU time
Info::
Third-party scripts: 302ms (26% of total)

Main Thread Breakdown

Script Evaluation 52% Other 18% Style & Layout 15% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://skipupload.com/321ms23ms23ms1st
https://www.googletagmanager.com/gtag/js?id=G-77LW2DWW2P302ms238ms62ms3rd
https://skipupload.com/_next/static/chunks/1255-24782c49a6a5b6bd.js209ms176ms18ms1st
https://skipupload.com/_next/static/chunks/webpack-a267c0f785bf292f.js174ms170ms0ms1st
Unattributable170ms16ms0ms1st
B
JS Bundles
11 scripts, 68 KB unused
REVIEW
11 scripts, 68 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-77LW...: 68 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 68 KB
68 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-77LW2DWW2P160 KB68 KB (42%)✓3rd
https://skipupload.com/_next/static/chunks/webpack-a267c0f785bf292f.js3 KB—✓1st
https://skipupload.com/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js55 KB—✓1st
https://skipupload.com/_next/static/chunks/1255-24782c49a6a5b6bd.js46 KB—✓1st
https://skipupload.com/_next/static/chunks/main-app-2ee50f287fd4e232.js1 KB—✓1st
https://skipupload.com/_next/static/chunks/2619-04bc32f026a0d946.js4 KB—✓1st
https://skipupload.com/_next/static/chunks/app/page-3854bf9f692f3ab9.js2 KB—✓1st
https://skipupload.com/_next/static/chunks/7191-acdb6b2242ca415f.js3 KB—✓1st
https://skipupload.com/_next/static/chunks/app/layout-24be91012c435ec0.js4 KB—✓1st
https://skipupload.com/_next/static/chunks/6784.919b6f58b7b3dad1.js4 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

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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
394 KB transferred, 21 requests
PASS
394 KB transferred, 21 requests
Info::
Page weighs 1.2 MB (394 KB transferred)
Info::
21 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
394 KB / 2.4 MB budget
394 KB transferred
21 requests
0.08 g CO2 per page load
JavaScript 283.8 KiB 72%
Fonts 47.9 KiB 12%
Other 32.9 KiB 8%
HTML 13.5 KiB 3%
CSS 10.0 KiB 3%
Other 5.5 KiB 1%
0 2.4 MB 4.9 MB
Under budget
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
No images on this page
PASS
No images on this page
Info::
No images on this page
0 images 0 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
1 fonts (48 KB)
PASS
1 fonts (48 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

48 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 500 ms 1.0 s 1.5 s 2.0 s FCP 947 ms LCP 2.0 shttps://skipupload.com/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://skipupload.com/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 47.9 KiB — 85 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 85 ms
Start 180 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 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
Warning::
Compressed response missing `Vary` header
The page is served with `Content-Encoding: br` but has no `Vary` header. Without `Vary: Accept-Encoding`, intermediary caches (corporate proxies, ISP caches) may serve the compressed variant to clients that didn't send the matching `Accept-Encoding` -- the client sees garbled bytes. Add `Vary: Accept-Encoding` whenever the response is conditionally compressed.
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
21 resources · 394 KB · 68 KB savings available
PASS
21 resources · 394 KB · 68 KB savings available
Info::
Within 1MB page-weight target
Got: 394 KB
Info::
~68 KB of savings available
Warning::
2 third-party resources (41% of weight)
21 resources · 393.6 KiB · 2 third-party Within 1MB page-weight target
JavaScript 72% · 283.8 KiB
Font 12% · 47.9 KiB
Other 8% · 33.4 KiB
Document 5% · 18.5 KiB
CSS 3% · 10.0 KiB

~67.6 KiB of savings available

Remove unused JavaScript: 67.6 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
Network Waterfall
21 requests over 794ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 947 ms LCP 2.0 shttps://skipupload.com// https://skipupload.com/ — 200 — 13.5 KiB — 81 ms — h2https://skipupload.com/cdn-cgi/speculation/cdn-cgi/speculation https://skipupload.com/cdn-cgi/speculation — 200 — 477 B — 21 ms — h2https://skipupload.com/_next/static/css/0ad88df45e95ef0e.css/_next/static/css/0ad88df45e95ef0e.... https://skipupload.com/_next/static/css/0ad88df45e95ef0e.css — 200 — 10.0 KiB — 51 ms — h2https://skipupload.com/_next/static/chunks/webpack-a267c0f785bf292f.js/_next/static/chunks/webpack-a267c0... https://skipupload.com/_next/static/chunks/webpack-a267c0f785bf292f.js — 200 — 3.5 KiB — 59 ms — h2https://skipupload.com/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js/_next/static/chunks/4bd1b696-100b9... https://skipupload.com/_next/static/chunks/4bd1b696-100b9d70ed4e49c1.js — 200 — 55.0 KiB — 70 ms — h2https://skipupload.com/_next/static/chunks/1255-24782c49a6a5b6bd.js/_next/static/chunks/1255-24782c49a... https://skipupload.com/_next/static/chunks/1255-24782c49a6a5b6bd.js — 200 — 45.7 KiB — 67 ms — h2https://skipupload.com/_next/static/chunks/main-app-2ee50f287fd4e232.js/_next/static/chunks/main-app-2ee50... https://skipupload.com/_next/static/chunks/main-app-2ee50f287fd4e232.js — 200 — 537 B — 48 ms — h2https://skipupload.com/_next/static/chunks/2619-04bc32f026a0d946.js/_next/static/chunks/2619-04bc32f02... https://skipupload.com/_next/static/chunks/2619-04bc32f026a0d946.js — 200 — 3.8 KiB — 54 ms — h2https://skipupload.com/_next/static/chunks/app/page-3854bf9f692f3ab9.js/_next/static/chunks/app/page-3854b... https://skipupload.com/_next/static/chunks/app/page-3854bf9f692f3ab9.js — 200 — 2.3 KiB — 51 ms — h2https://skipupload.com/_next/static/chunks/7191-acdb6b2242ca415f.js/_next/static/chunks/7191-acdb6b224... https://skipupload.com/_next/static/chunks/7191-acdb6b2242ca415f.js — 200 — 3.3 KiB — 65 ms — h2https://skipupload.com/_next/static/chunks/app/layout-24be91012c435ec0.js/_next/static/chunks/app/layout-24b... https://skipupload.com/_next/static/chunks/app/layout-24be91012c435ec0.js — 200 — 3.6 KiB — 64 ms — h2https://skipupload.com/_next/static/media/e4af272ccee01ff0-s.p.woff2/_next/static/media/e4af272ccee01ff... https://skipupload.com/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 47.9 KiB — 85 ms — h3https://skipupload.com/image-tools/index.txt?_rsc=1p-R_iEY6bj0jY31/image-tools/index.txt?_rsc=1p-R_iE... https://skipupload.com/image-tools/index.txt?_rsc=1p-R_iEY6bj0jY31 — 200 — 8.4 KiB — 59 ms — h3https://skipupload.com/pdf-tools/index.txt?_rsc=1p-R_iEY6bj0jY31/pdf-tools/index.txt?_rsc=1p-R_iEY6... https://skipupload.com/pdf-tools/index.txt?_rsc=1p-R_iEY6bj0jY31 — 200 — 8.4 KiB — 60 ms — h3https://skipupload.com/qr-tools/index.txt?_rsc=1p-R_iEY6bj0jY31/qr-tools/index.txt?_rsc=1p-R_iEY6b... https://skipupload.com/qr-tools/index.txt?_rsc=1p-R_iEY6bj0jY31 — 200 — 8.6 KiB — 61 ms — h3https://skipupload.com/privacy/index.txt?_rsc=1p-R_iEY6bj0jY31/privacy/index.txt?_rsc=1p-R_iEY6bj... https://skipupload.com/privacy/index.txt?_rsc=1p-R_iEY6bj0jY31 — 200 — 7.0 KiB — 52 ms — h3https://skipupload.com/favicon.ico/favicon.ico https://skipupload.com/favicon.ico — 404 — 5.1 KiB — 40 ms — h3https://skipupload.com/_next/static/chunks/6784.919b6f58b7b3dad1.js/_next/static/chunks/6784.919b6f58b... https://skipupload.com/_next/static/chunks/6784.919b6f58b7b3dad1.js — 200 — 3.6 KiB — 40 ms — h3https://www.googletagmanager.com/gtag/js?id=G-77LW2DWW2Pwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-77LW2DWW2P — 200 — 160.0 KiB — 276 ms — h2https://skipupload.com/_next/static/chunks/app/privacy/page-a8dbea985d5d199c.js/_next/static/chunks/app/privacy/pa... https://skipupload.com/_next/static/chunks/app/privacy/page-a8dbea985d5d199c.js — 200 — 2.5 KiB — 35 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-77LW2DWW2P&gtm=45je66o1v9256069011za200zd9256069011&_p=1782642379394&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1208432526.1782642379&frm=0&pscdl=noapi&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B149.0.7827.196%7CNot)A%253BBrand%3B24.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938468~118395335~119027224~119576881~119576885~119576891~119576895&sid=1782642379&sct=1&seg=0&dl=https%3A%2F%2Fskipupload.com%2F&dt=SkipUpload%20%E2%80%94%20Private%20Browser-Based%20File%20Tools&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=699region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-77LW2DWW2P&gtm=45je66o1v9256069011za200zd9256069011&_p=1782642379394&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1208432526.1782642379&frm=0&pscdl=noapi&rcb=10&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B149.0.7827.196%7CNot)A%253BBrand%3B24.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=115938466~115938468~118395335~119027224~119576881~119576885~119576891~119576895&sid=1782642379&sct=1&seg=0&dl=https%3A%2F%2Fskipupload.com%2F&dt=SkipUpload%20%E2%80%94%20Private%20Browser-Based%20File%20Tools&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=699 — 204 — 548 B — 95 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
26% of JavaScript execution is third-party
First-party Third-party 302ms · 160KB · €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 302ms
Transfer 160 KB
Unused 42%
Monthly Cost €3/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 302ms and costs ~€3/month

Google Tag Manager takes 302ms 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

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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