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https://stripe.com

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
3
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
33
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.

3.44 s

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

6.32 s

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

88.31 s

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

0.028

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

8.86 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.

118.11 s

Page Load Progression

1.5 s
3.1 s
4.6 s
6.2 s
7.7 s
9.2 s
10.8 s
12.3 s
Checks
14
5 PASS 4 REVIEW 3 FIX
D
Third-Party Impact
Action
90% third-party, 0 ms blocking
FIX
90% third-party, 0 ms blocking
Warning::
Third-party code accounts for 90% of page weight (1.7 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
90%
First-party Third-party
F
JS Execution Cost
Action
123791ms total JS execution
FIX
123791ms total JS execution
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 112559ms CPU time
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 3111ms CPU time
Warning::
Unattributable: 2537ms CPU time
Warning::
https://stripe.com/en-br: 2313ms CPU time
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 949ms CPU time
Warning::
Third-party scripts: 121478ms (98% of total)

Main Thread Breakdown

Other 90% Script Evaluation 6%
ScriptTotalScriptingParse/CompileParty
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/50582.fb4a3d13071d1490.js112559ms2382ms11ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/framework-9f89521118404fe7.js3111ms2279ms57ms3rd
Unattributable2537ms170ms0ms3rd
https://stripe.com/en-br2313ms11ms1ms1st
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/_app-889d57bc5e09f072.js949ms562ms316ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/index-6d8874e6de5710a3.js625ms382ms129ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/84246.854c27f9d542172f.js434ms257ms17ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/65223-1423d8e6ad8de9bf.js384ms12ms1ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/53261-9c921aad045e6943.js262ms234ms8ms3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/c67c952e-7f65a464f661b1d2.js220ms189ms30ms3rd

Showing top 10 of 13 scripts

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
1.9 MB transferred, 112 requests
REVIEW
1.9 MB transferred, 112 requests
Info::
Page weighs 6.8 MB (1.9 MB transferred)
Warning::
JavaScript is 1.3 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.3 MB
Warning::
112 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
112 requests
0.39 g CO2 per page load
JavaScript 1.3 MiB 71%
Images 217.2 KiB 11%
HTML 164.8 KiB 9%
Fonts 70.1 KiB 4%
CSS 60.6 KiB 3%
Other 20.7 KiB 1%
Other 9.3 KiB 0%
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
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 217 KB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
79 scripts, 226 KB unused
REVIEW
79 scripts, 226 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...: 80 KB unused (20%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://b.stripecdn.com/mkt-ssr-statics/assets/_ne...: 43 KB unused (76%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 226 KB
226 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/index-6d8874e6de5710a3.js218 KB103 KB (47%)✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/_app-889d57bc5e09f072.js396 KB80 KB (20%)✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/c67c952e-7f65a464f661b1d2.js57 KB43 KB (76%)✓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/34552.fae148eb6b06113b.js2 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/76629.396a50238922b152.js2 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/96201.b69ca6d7416f24b0.js3 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/77723.dd3ba52791b41cc0.js2 KB—✓3rd
https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/96550.6f7488d7e4331269.js2 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.4 s LCP 6.3 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 — 58.0 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 — 12.1 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
23 hints, 0 missing preconnects
PASS
23 hints, 0 missing preconnects
Info::
Page uses 23 resource hint(s)

Current Resource Hints

preconnect
6
preload
+2
12
dns-prefetch
5
prefetch
—

23 resource hints configured

Network Waterfall
112 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
98% of JavaScript execution is third-party
First-party Third-party 121478ms · 865KB · $695/mo
b.stripecdn.com
Other
Costly
Execution 112559ms
Transfer 23 KB
Monthly Cost $644/mo
b.stripecdn.com
Other
Costly
Execution 3111ms
Transfer 43 KB
Monthly Cost $18/mo
Unattributable
Other
Costly
Execution 2537ms
Transfer 0 KB
Monthly Cost $15/mo
b.stripecdn.com
Other
Costly
Execution 949ms
Transfer 396 KB
Unused 20%
Monthly Cost $5/mo
b.stripecdn.com
Other
Costly
Execution 625ms
Transfer 218 KB
Unused 47%
Monthly Cost $4/mo
b.stripecdn.com
Other
Costly
Execution 434ms
Transfer 27 KB
Monthly Cost $2/mo
b.stripecdn.com
Other
Costly
Execution 384ms
Transfer 3 KB
Monthly Cost $2/mo
b.stripecdn.com
Other
Costly
Execution 262ms
Transfer 18 KB
Monthly Cost $2/mo
b.stripecdn.com
Other
Costly
Execution 220ms
Transfer 57 KB
Unused 76%
Monthly Cost $1/mo
b.stripecdn.com
Other
Optional
Execution 161ms
Transfer 23 KB
Monthly Cost $1/mo
b.stripecdn.com
Other
Optional
Execution 155ms
Transfer 33 KB
Monthly Cost $1/mo
b.stripecdn.com
Other
Optional
Execution 81ms
Transfer 24 KB
Monthly Cost $0/mo

These scripts may cost more than they're worth

  • b.stripecdn.com adds 112559ms and costs ~$644/month
  • b.stripecdn.com adds 3111ms and costs ~$18/month
  • Unattributable adds 2537ms and costs ~$15/month
  • b.stripecdn.com adds 949ms and costs ~$5/month
  • b.stripecdn.com adds 625ms and costs ~$4/month
  • b.stripecdn.com adds 434ms and costs ~$2/month
  • b.stripecdn.com adds 384ms and costs ~$2/month
  • b.stripecdn.com adds 262ms and costs ~$2/month
  • b.stripecdn.com adds 220ms and costs ~$1/month

98% 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 112559ms 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 3111ms 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 2537ms 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 949ms 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 625ms 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 434ms 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 384ms 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 262ms 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 220ms 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

76% of b.stripecdn.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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