Performance
· 18 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
3.30 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.31 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
8.38 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.
6.21 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.
25.67 s
Page Load Progression
DThird-Party ImpactAction90% third-party, 0 ms blockingFIX
FJS Execution CostAction16191ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/50582.fb4a3d13071d1490.js | 11540ms | 388ms | 5ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/framework-bfbcaa5a2903bc7d.js | 1558ms | 1269ms | 22ms | 3rd |
| https://stripe.com/en-fr | 787ms | 7ms | 0ms | 1st |
| Unattributable | 585ms | 17ms | 0ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/_app-572356c5688c506e.js | 485ms | 294ms | 161ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/index-5345fca6aa4f7d25.js | 286ms | 220ms | 65ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/84246.0054e08096e5226b.js | 275ms | 169ms | 8ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/c67c952e-7f65a464f661b1d2.js | 182ms | 166ms | 15ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/38484-72a8319f943b4083.js | 180ms | 8ms | 2ms | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/81888-44c041869848e4ee.js | 127ms | 111ms | 5ms | 3rd |
Showing top 10 of 12 scripts
DPage Weight InventoryAction113 resources · 1.9 MB · 227 KB savings availableFIX
~227.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 113 resources | 1.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CPage Weight BudgetAction1.9 MB transferred, 113 requestsREVIEW
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
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.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
CJS BundlesAction84 scripts, 227 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/index-5345fca6aa4f7d25.js | 216 KB | 103 KB (48%) | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/pages/_app-572356c5688c506e.js | 398 KB | 82 KB (21%) | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/c67c952e-7f65a464f661b1d2.js | 57 KB | 43 KB (76%) | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/framework-bfbcaa5a2903bc7d.js | 43 KB | — | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/3dfade9e-4ca93d92ac876e62.js | 16 KB | — | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/76629.396a50238922b152.js | 2 KB | — | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/52643.2d78e2446d39abbd.js | 3 KB | — | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/13956.1a44ca5c0dc36ae3.js | 2 KB | — | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/17006.2eb14a6f079c6644.js | 1 KB | — | ✓ | 3rd |
| https://b.stripecdn.com/mkt-ssr-statics/assets/_next/static/chunks/77723.dd3ba52791b41cc0.js | 2 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
AImage Optimization9 images, 0 KB saveablePASS
A+Font Loading2 fonts (70 KB)PASS
Web fonts
2
70 KB total
Render-blocking
0
of 2
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints23 hints, 0 missing preconnectsPASS
Current Resource Hints
23 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall113 requests over 2540msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
b.stripecdn.com b.stripecdn.com | Other | 11540ms | 23 KB | — | €48/mo | Costly |
b.stripecdn.com b.stripecdn.com | Other | 1558ms | 43 KB | — | €7/mo | Costly |
Unattributable Unattributable | Other | 585ms | 0 KB | — | €2/mo | Costly |
b.stripecdn.com b.stripecdn.com | Other | 485ms | 398 KB | 21% | €2/mo | Costly |
b.stripecdn.com b.stripecdn.com | Other | 286ms | 216 KB | 48% | €1/mo | Costly |
b.stripecdn.com b.stripecdn.com | Other | 275ms | 26 KB | — | €1/mo | Costly |
b.stripecdn.com b.stripecdn.com | Other | 182ms | 57 KB | 76% | €1/mo | Optional |
b.stripecdn.com b.stripecdn.com | Other | 180ms | 9 KB | — | €1/mo | Optional |
b.stripecdn.com b.stripecdn.com | Other | 127ms | 18 KB | — | €1/mo | Optional |
b.stripecdn.com b.stripecdn.com | Other | 97ms | 23 KB | — | €0/mo | Optional |
b.stripecdn.com b.stripecdn.com | Other | 89ms | 33 KB | — | €0/mo | Optional |
These scripts may cost more than they're worth
- b.stripecdn.com adds 11540ms and costs ~€48/month
- b.stripecdn.com adds 1558ms and costs ~€7/month
- Unattributable adds 585ms and costs ~€2/month
- b.stripecdn.com adds 485ms and costs ~€2/month
- b.stripecdn.com adds 286ms and costs ~€1/month
- b.stripecdn.com adds 275ms and costs ~€1/month
95% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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 11540ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
b.stripecdn.com takes 1558ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 585ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
b.stripecdn.com takes 485ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
b.stripecdn.com takes 286ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
b.stripecdn.com takes 275ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
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.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Real-User Performance (CrUX)Field metrics from the Chrome User Experience ReportINFO
Chrome User Experience (CrUX)
Real-user metrics from the Chrome UX Report (2026-04-05 — 2026-05-02)
LCP (p75)
1115 ms
93% good
INP (p75)
96 ms
90% good
CLS (p75)
0.000
97% good
FCP (p75)
1059 ms
TTFB (p75)
457 ms