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https://stripe.com

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
81
GRADE
B
FIX
3
REVIEW
4
PASS
5
INFO
3

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

966 ms

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

1.73 s

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

18.51 s

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

0.015

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

4.50 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.

34.09 s

Page Load Progression

2.3 s
4.6 s
6.9 s
9.2 s
11.5 s
13.8 s
16.1 s
18.4 s
Checks
15
5 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
89% third-party, 0 ms blocking
FIX
89% third-party, 0 ms blocking
Warning::
Third-party code accounts for 89% of page weight (1.5 MiB of 1.7 MiB)
Info::
Third-party blocking time is low (0 ms)
89%
First-party Third-party
F
JS Execution Cost
Action
34842ms total JS execution
FIX
34842ms total JS execution
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 32860ms CPU time
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 878ms CPU time
Warning::
https://stripe.com/en-fr: 368ms CPU time
Warning::
Unattributable: 326ms CPU time
Info::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 178ms CPU time
Warning::
Third-party scripts: 34474ms (99% of total)

Main Thread Breakdown

Other 94% Script Evaluation 3%
ScriptTotalScriptingParse/CompileParty
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/50582.fb4a3d13071d1490.js32860ms475ms1ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/framework-9f89521118404fe7.js878ms350ms3ms3rd
https://stripe.com/en-fr368ms7ms0ms1st
Unattributable326ms34ms0ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/_app-c498e8e0ffe11922.js178ms114ms48ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/84246.854c27f9d542172f.js83ms43ms3ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/index-2b2c46cb1bfadcef.js80ms54ms19ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/90943-70e37ffd5bfe28da.js69ms4ms0ms3rd
F
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.

No Cache-Control header

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

C
Page Weight Budget
Action
1.7 MB transferred, 111 requests
REVIEW
1.7 MB transferred, 111 requests
Info::
Page weighs 6.8 MB (1.7 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Warning::
111 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.36 g CO2 per page load
1.7 MB / 2.4 MB budget
1.7 MB transferred
111 requests
0.36 g CO2 per page load
JavaScript 1.2 MiB 73%
HTML 168.3 KiB 10%
Images 143.6 KiB 8%
Fonts 69.6 KiB 4%
CSS 56.9 KiB 3%
Other 20.7 KiB 1%
Other 10.3 KiB 1%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
9 images, 0 KB saveable
REVIEW
9 images, 0 KB saveable
Info::
All images are well-optimized
9 images 144 KB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
79 scripts, 212 KB unused
REVIEW
79 scripts, 212 KB unused
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 103 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 67 KB unused (20%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 42 KB unused (74%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 212 KB
212 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/index-2b2c46cb1bfadcef.js217 KB103 KB (47%)✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/_app-c498e8e0ffe11922.js337 KB67 KB (20%)✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/c67c952e-7f65a464f661b1d2.js56 KB42 KB (74%)✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/2791.83aa5fb914de3e9d.js1 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/15263.83460f5b8af8173e.js1 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/35729.33c2cdc4d27e8533.js1 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/34552.fae148eb6b06113b.js2 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/25879.d69b55cd25254173.js2 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/76629.396a50238922b152.js1 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/52643.2d78e2446d39abbd.js3 KB—✓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

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

Green Hosting

No green hosting detected

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
2 fonts (70 KB)
PASS
2 fonts (70 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

70 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 500 ms 1.0 s 1.5 s FCP 966 ms LCP 1.7 shttps://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/media/Sohne.cb178166.woff2Sohne.cb178166.woff2 https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/media/Sohne.cb178166.woff2 — 57.9 KiB — 0 ms — font-display: swaphttps://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/media/SourceCodePro-Medium.f5ba3e6a.woff2SourceCodePro-Medium.f5... https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/media/SourceCodePro-Medium.f5ba3e6a.woff2 — 11.7 KiB — 0 ms — font-display: swap
Sohne.cb178166.woff2 woff2 swap
Size 58 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
SourceCodePro-Medium.f5... woff2 swap
Size 12 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
111 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
99% of JavaScript execution is third-party
First-party Third-party 34474ms · 651KB · €145/mo
b.stripecdn.com
Other
Costly
Execution 32860ms
Transfer 22 KB
Monthly Cost €138/mo
b.stripecdn.com
Other
Costly
Execution 878ms
Transfer 42 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 326ms
Transfer 0 KB
Monthly Cost €1/mo
b.stripecdn.com
Other
Optional
Execution 178ms
Transfer 337 KB
Unused 20%
Monthly Cost €1/mo
b.stripecdn.com
Other
Optional
Execution 83ms
Transfer 26 KB
Monthly Cost €0/mo
b.stripecdn.com
Other
Optional
Execution 80ms
Transfer 217 KB
Unused 47%
Monthly Cost €0/mo
b.stripecdn.com
Other
Optional
Execution 69ms
Transfer 7 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • b.stripecdn.com adds 32860ms and costs ~€138/month
  • b.stripecdn.com adds 878ms and costs ~€4/month
  • Unattributable adds 326ms and costs ~€1/month

99% 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

b.stripecdn.com takes 32860ms 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

b.stripecdn.com takes 878ms 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 326ms 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

Real-User Performance (CrUX)
Field metrics from the Chrome User Experience Report
INFO

Chrome User Experience (CrUX)

Real-user metrics from the Chrome UX Report (2026-03-09 — 2026-04-05)

LCP (p75)

1100 ms

93% good

INP (p75)

95 ms

90% good

CLS (p75)

0.000

97% good

FCP (p75)

1041 ms

TTFB (p75)

460 ms

This origin passes Core Web Vitals assessment
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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