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https://www.vercel.com

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
37
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.
92
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.

3.61 s

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

11.87 s

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

2.26 s

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.

4.89 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.

19.29 s

Page Load Progression

611 ms
1.2 s
1.8 s
2.4 s
3.1 s
3.7 s
4.3 s
4.9 s
Checks
16
7 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.4 MB transferred, 134 requests
FIX
2.4 MB transferred, 134 requests
Warning::
Page weighs 9.0 MB (2.4 MB transferred)
Warning::
JavaScript is 1.9 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.9 MB
Warning::
134 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.51 g CO2 per page load
2.4 MB / 2.4 MB budget
2.4 MB transferred
134 requests
0.51 g CO2 per page load
JavaScript 1.9 MiB 77%
Fonts 197.1 KiB 8%
CSS 144.9 KiB 6%
Other 96.8 KiB 4%
HTML 71.0 KiB 3%
Other 53.9 KiB 2%
Images 15.1 KiB 1%
Other 4.6 KiB 0%
Other 2.5 KiB 0%
Other 2.2 KiB 0%
0 2.4 MB 4.9 MB
Over 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.4 MiB of 2.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7626ms total JS execution
FIX
7626ms total JS execution
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 3633ms CPU time
Warning::
https://vercel.com/: 2073ms CPU time
Warning::
Unattributable: 895ms CPU time
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 305ms CPU time
Info::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 231ms CPU time
Warning::
Third-party scripts: 7626ms (100% of total)

Main Thread Breakdown

Script Evaluation 41% Style & Layout 28% Other 13% Script Parsing & Compilation 12% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/37d1_i0u8i3xo.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke3633ms2667ms28ms3rd
https://vercel.com/2073ms259ms168ms3rd
Unattributable895ms32ms0ms3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/2sv0t1sgn9uzi.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke305ms2ms3ms3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/32lgw2bkpzylx.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke231ms207ms21ms3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/0x64_ot0mviey.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke201ms2ms198ms3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/2zf8vptczjdlv.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke185ms134ms15ms3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/2_vjjytq56jp1.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke52ms1ms51ms3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/3_b_8x5vc29is.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke50ms2ms22ms3rd
F
JS Bundles
Action
87 scripts, 891 KB unused
FIX
87 scripts, 891 KB unused
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 407 KB unused (100%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 98 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 63 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 51 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://vercel.com/vc-ap-vercel-marketing/_next/st...: 39 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 891 KB
891 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/0x64_ot0mviey.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke409 KB407 KB (100%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/2_vjjytq56jp1.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke99 KB98 KB (99%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/2pcu9qolsn0i1.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke87 KB63 KB (75%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/1-32ef6nc590x.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke52 KB51 KB (99%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/2d-2k7f4fhfsh.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke50 KB39 KB (83%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/0sg4fttb-h4hs.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke37 KB31 KB (83%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/32lgw2bkpzylx.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke48 KB29 KB (60%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/1-bijuerv2mca.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke36 KB27 KB (75%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/253oyh69wndsi.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke27 KB27 KB (100%)✓3rd
https://vercel.com/vc-ap-vercel-marketing/_next/static/chunks/3-dscl9un485-.js?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke28 KB25 KB (91%)✓3rd

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

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
Image Optimization
5 images, 0 KB saveable
REVIEW
5 images, 0 KB saveable
Info::
All images are well-optimized
5 images 15 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
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+
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+
Font Loading
8 fonts (197 KB)
PASS
8 fonts (197 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

197 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 3.6 s LCP 11.9 shttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/797e433ab948586e.p.3f30ggp2vw8zj.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke797e433ab948586e.p.3f30... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/797e433ab948586e.p.3f30ggp2vw8zj.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 30.8 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Circle.p.0jixsyww9kd4y.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASokeGeistPixel_Circle.p.0ji... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Circle.p.0jixsyww9kd4y.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 27.8 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Grid.p.30wdobjl9hgxl.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASokeGeistPixel_Grid.p.30wdo... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Grid.p.30wdobjl9hgxl.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 28.1 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Line.p.0rlph12vacpf4.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASokeGeistPixel_Line.p.0rlph... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Line.p.0rlph12vacpf4.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 18.1 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Square.p.2k-0ab8oywfv4.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASokeGeistPixel_Square.p.2k-... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Square.p.2k-0ab8oywfv4.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 28.2 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Triangle.p.0qs0n6zg5c5u1.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASokeGeistPixel_Triangle.p.0... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/GeistPixel_Triangle.p.0qs0n6zg5c5u1.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 28.5 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/caa3a2e1cccd8315.p.400zotvijr2rn.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASokecaa3a2e1cccd8315.p.400z... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/caa3a2e1cccd8315.p.400zotvijr2rn.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 28.0 KiB — 0 ms — font-display: swaphttps://vercel.com/vc-ap-vercel-marketing/_next/static/media/9d9927955a95a20d-s.p.0i8f_s95odn18.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke9d9927955a95a20d-s.p.0i... https://vercel.com/vc-ap-vercel-marketing/_next/static/media/9d9927955a95a20d-s.p.0i8f_s95odn18.woff2?dpl=dpl_Co485LAgXH9s8bLjnpK453vASoke — 7.5 KiB — 0 ms — font-display: swap
797e433ab948586e.p.3f30... woff2 swap
Size 31 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistPixel_Circle.p.0ji... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistPixel_Grid.p.30wdo... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistPixel_Line.p.0rlph... woff2 swap
Size 18 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistPixel_Square.p.2k-... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
GeistPixel_Triangle.p.0... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
caa3a2e1cccd8315.p.400z... woff2 swap
Size 28 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
9d9927955a95a20d-s.p.0i... woff2 swap
Size 8 KB
Load time 0 ms
Start 0 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
20 hints, 0 missing preconnects
PASS
20 hints, 0 missing preconnects
Info::
Page uses 20 resource hint(s)

Current Resource Hints

preconnect
—
preload
+10
20
dns-prefetch
—
prefetch
—

20 resource hints configured

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
134 requests over 0ms
INFO

Performance analysis not available for this result.

Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 7626ms · 783KB · €83/mo
vercel.com
Other
Costly
Execution 3633ms
Transfer 64 KB
Monthly Cost €39/mo
vercel.com
Other
Costly
Execution 2073ms
Transfer 71 KB
Monthly Cost €22/mo
Unattributable
Other
Costly
Execution 895ms
Transfer 0 KB
Monthly Cost €10/mo
vercel.com
Other
Costly
Execution 305ms
Transfer 11 KB
Monthly Cost €3/mo
vercel.com
Other
Costly
Execution 231ms
Transfer 48 KB
Unused 60%
Monthly Cost €3/mo
vercel.com
Other
Costly
Execution 201ms
Transfer 409 KB
Unused 100%
Monthly Cost €2/mo
vercel.com
Other
Optional
Execution 185ms
Transfer 30 KB
Monthly Cost €2/mo
vercel.com
Other
Optional
Execution 52ms
Transfer 99 KB
Unused 99%
Monthly Cost €1/mo
vercel.com
Other
Optional
Execution 50ms
Transfer 50 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • vercel.com adds 3633ms and costs ~€39/month
  • vercel.com adds 2073ms and costs ~€22/month
  • Unattributable adds 895ms and costs ~€10/month
  • vercel.com adds 305ms and costs ~€3/month
  • vercel.com adds 231ms and costs ~€3/month
  • vercel.com adds 201ms and costs ~€2/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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

vercel.com takes 3633ms 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

vercel.com takes 2073ms 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

Unattributable takes 895ms 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

vercel.com takes 305ms 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

vercel.com takes 231ms 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

60% of vercel.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

vercel.com takes 201ms 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

100% of vercel.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

99% of vercel.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

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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