Skip to content
https://capfi.fr

Performance

· 26 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
6
PASS
15
INFO
3

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

Mobile Desktop
82
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.
100
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.

1.76 s

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

3.56 s

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

8 ms

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

0.164

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

2.58 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.

3.68 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
26
15 PASS 6 REVIEW 2 FIX
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 (411.1 KiB of 412.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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.

B
Image Optimization
4 images, 0 KB saveable
REVIEW
4 images, 0 KB saveable
Warning::
https://www.capfi.fr/assets/images/logo_Bcorp_blan... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.capfi.fr/assets/images/logo_blanc.webp is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 278 KB
0 oversized -0 KB
2 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

B
JS Execution Cost
811ms total JS execution
REVIEW
811ms total JS execution
Warning::
https://www.capfi.fr/: 519ms CPU time
Info::
Unattributable: 217ms CPU time
Info::
https://www.capfi.fr/assets/js/dynamic-content.js: 75ms CPU time
Warning::
Third-party scripts: 594ms (73% of total)

Main Thread Breakdown

Style & Layout 48% Other 30% Script Evaluation 12% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.capfi.fr/519ms4ms1ms3rd
Unattributable217ms8ms0ms1st
https://www.capfi.fr/assets/js/dynamic-content.js75ms70ms3ms3rd
C
Compression Algorithm
Action
Main response served uncompressed
REVIEW
Main response served uncompressed
Info::
Main HTML response has no Content-Encoding (uncompressed)
The main HTML document is served without compression. The Text Compression section above lists the broader picture; for the main response specifically, even gzip would shave ~70-80% off most text payloads.
B
Main HTML Cache-Control
No Cache-Control header on main HTML response
REVIEW
No Cache-Control header on main HTML response
Info::
Main HTML response has no Cache-Control header
Without an explicit Cache-Control, browsers fall back to heuristic caching (~10% of Last-Modified age). Set `Cache-Control: no-cache` or `max-age=300` for HTML to control freshness explicitly -- prevents stale auth state and SPA shell drift.
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

A+
Page Weight Budget
412 KB transferred, 16 requests
PASS
412 KB transferred, 16 requests
Info::
Page weighs 524 KB (412 KB transferred)
Info::
16 HTTP requests
Info::
Estimated 0.08 g CO2 per page load
412 KB / 2.4 MB budget
412 KB transferred
16 requests
0.08 g CO2 per page load
Images 278.2 KiB 68%
Fonts 60.2 KiB 15%
Other 21.4 KiB 5%
JavaScript 18.8 KiB 5%
CSS 18.1 KiB 4%
HTML 13.5 KiB 3%
Other 1.8 KiB 0%
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+
Font Loading
3 fonts (60 KB)
PASS
3 fonts (60 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

60 KB total

Render-blocking

0

of 3

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 FCP 1.8 s LCP 3.6 shttps://www.capfi.fr/assets/police/Flexo-Bold.woff2Flexo-Bold.woff2 https://www.capfi.fr/assets/police/Flexo-Bold.woff2 — 20.4 KiB — 974 ms — font-display: swaphttps://www.capfi.fr/assets/police/Flexo-Thin.woff2Flexo-Thin.woff2 https://www.capfi.fr/assets/police/Flexo-Thin.woff2 — 19.2 KiB — 974 ms — font-display: swaphttps://www.capfi.fr/assets/police/Flexo-Regular.woff2Flexo-Regular.woff2 https://www.capfi.fr/assets/police/Flexo-Regular.woff2 — 20.5 KiB — 1.0 s — font-display: swap
Flexo-Bold.woff2 woff2 swap
Size 20 KB
Load time 974 ms
Start 747 ms
Risk FOUT — text flashes from fallback to web font
Flexo-Thin.woff2 woff2 swap
Size 19 KB
Load time 974 ms
Start 747 ms
Risk FOUT — text flashes from fallback to web font
Flexo-Regular.woff2 woff2 swap
Size 21 KB
Load time 1.0 s
Start 747 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
JS Bundles
4 scripts, 0 KB unused
PASS
4 scripts, 0 KB unused
Warning::
https://www.capfi.fr/assets/js/dynamic-content.js: unminified — 3 KB could be saved
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.capfi.fr/assets/js/main.js6 KB—✓3rd
https://www.capfi.fr/assets/js/dynamic-content.js9 KB—✗3rd
https://www.capfi.fr/assets/js/cookie-consent.js2 KB—✓3rd
https://www.capfi.fr/assets/js/eco-badge.js2 KB—✓3rd
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
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+
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+
Server Response Intelligence
1 server-response signal(s) detected
PASS
1 server-response signal(s) detected
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
16 resources · 412 KB · 0 KB savings available
PASS
16 resources · 412 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 412 KB
Warning::
15 third-party resources (100% of weight)
Info::
1 resources over 200KB
16 resources · 412.0 KiB · 15 third-party Within 1MB page-weight target
Image 73% · 298.7 KiB
Font 15% · 60.2 KiB
JavaScript 5% · 18.8 KiB
CSS 4% · 18.1 KiB
Document 4% · 14.5 KiB
Other 0% · 1.8 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::
4 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
16 requests over 1999ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.8 s LCP 3.6 shttps://capfi.fr// https://capfi.fr/ — 301 — 964 B — 100 ms — h2https://www.capfi.fr/www.capfi.fr/ https://www.capfi.fr/ — 200 — 13.5 KiB — 466 ms — h2https://www.capfi.fr/assets/css/main.csswww.capfi.fr/assets/css/main.css https://www.capfi.fr/assets/css/main.css — 200 — 18.1 KiB — 110 ms — h2https://www.capfi.fr/assets/images/logo_blanc.webpwww.capfi.fr/assets/images/logo_bla... https://www.capfi.fr/assets/images/logo_blanc.webp — 200 — 8.0 KiB — 81 ms — h2https://www.capfi.fr/assets/images/logo_capfi.webpwww.capfi.fr/assets/images/logo_cap... https://www.capfi.fr/assets/images/logo_capfi.webp — 200 — 10.2 KiB — 111 ms — h2https://www.capfi.fr/assets/images/logo_Bcorp_blanc.svgwww.capfi.fr/assets/images/logo_Bco... https://www.capfi.fr/assets/images/logo_Bcorp_blanc.svg — 200 — 5.6 KiB — 127 ms — h2https://www.capfi.fr/assets/js/main.jswww.capfi.fr/assets/js/main.js https://www.capfi.fr/assets/js/main.js — 200 — 5.5 KiB — 107 ms — h2https://www.capfi.fr/assets/js/dynamic-content.jswww.capfi.fr/assets/js/dynamic-cont... https://www.capfi.fr/assets/js/dynamic-content.js — 200 — 8.8 KiB — 107 ms — h2https://www.capfi.fr/assets/js/cookie-consent.jswww.capfi.fr/assets/js/cookie-conse... https://www.capfi.fr/assets/js/cookie-consent.js — 200 — 2.5 KiB — 107 ms — h2https://www.capfi.fr/assets/js/eco-badge.jswww.capfi.fr/assets/js/eco-badge.js https://www.capfi.fr/assets/js/eco-badge.js — 200 — 2.0 KiB — 339 ms — h2https://www.capfi.fr/assets/images/capfi_home_bg.jpgwww.capfi.fr/assets/images/capfi_ho... https://www.capfi.fr/assets/images/capfi_home_bg.jpg — 200 — 254.4 KiB — 1.3 s — h2https://www.capfi.fr/assets/police/Flexo-Bold.woff2www.capfi.fr/assets/police/Flexo-Bo... https://www.capfi.fr/assets/police/Flexo-Bold.woff2 — 200 — 20.4 KiB — 974 ms — h2https://www.capfi.fr/assets/police/Flexo-Thin.woff2www.capfi.fr/assets/police/Flexo-Th... https://www.capfi.fr/assets/police/Flexo-Thin.woff2 — 200 — 19.2 KiB — 974 ms — h2https://www.capfi.fr/assets/police/Flexo-Regular.woff2www.capfi.fr/assets/police/Flexo-Re... https://www.capfi.fr/assets/police/Flexo-Regular.woff2 — 200 — 20.5 KiB — 1.0 s — h2https://www.capfi.fr/api/news?limit=3www.capfi.fr/api/news?limit=3 https://www.capfi.fr/api/news?limit=3 — 200 — 1.8 KiB — 848 ms — h2https://www.capfi.fr/assets/images/logo_infini.pngwww.capfi.fr/assets/images/logo_inf... https://www.capfi.fr/assets/images/logo_infini.png — 200 — 20.5 KiB — 55 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
73% of JavaScript execution is third-party
First-party Third-party 594ms · 22KB · €7/mo
www.capfi.fr
Other
Costly
Execution 519ms
Transfer 14 KB
Monthly Cost €6/mo
www.capfi.fr
Other
Optional
Execution 75ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.capfi.fr adds 519ms and costs ~€6/month

73% 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

www.capfi.fr takes 519ms 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

Image Optimization
12 images, 20 KB total, 6 KB wasted
INFO

Image Optimization Audit

Total Images

12

Total Size

20 KB

Oversized

1

Wasted

6 KB

5 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback