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Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
5
PASS
6
INFO
2

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

Mobile Desktop
93
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
85
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

792 ms

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

1.62 s

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

29 ms

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

0.039

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

1.21 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.

1.98 s

Page Load Progression

426 ms
852 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
14
6 PASS 5 REVIEW 1 FIX
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
Page Weight Budget
1.3 MB transferred, 67 requests
REVIEW
1.3 MB transferred, 67 requests
Info::
Page weighs 3.3 MB (1.3 MB transferred)
Info::
CSS is 248 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 248 KB
Info::
67 HTTP requests
Info::
Estimated 0.27 g CO2 per page load
1.3 MB / 2.4 MB budget
1.3 MB transferred
67 requests
0.27 g CO2 per page load
JavaScript 486.4 KiB 37%
Images 436.7 KiB 33%
CSS 248.2 KiB 19%
Fonts 98.3 KiB 8%
HTML 27.3 KiB 2%
Other 3.1 KiB 0%
Other 2.5 KiB 0%
Other 1.5 KiB 0%
0 2.4 MB 4.9 MB
Under budget

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

C
Image Optimization
Action
39 images, 0 KB saveable
REVIEW
39 images, 0 KB saveable
Warning::
https://www.caf.fr/themes/custom/caf_bootstrap5/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.caf.fr/sites/default/files/medias/refn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.caf.fr/themes/custom/caf_bootstrap5/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.caf.fr/themes/custom/caf_bootstrap5/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.caf.fr/sites/default/files/medias/cnaf... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
39 images 437 KB
0 oversized -0 KB
37 legacy format
5 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

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

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
687ms total JS execution
REVIEW
687ms total JS execution
Info::
https://www.caf.fr/sites/default/files/js/js_5iMT6...: 212ms CPU time
Info::
https://www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe...: 147ms CPU time
Info::
Unattributable: 127ms CPU time
Info::
https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260...: 107ms CPU time
Info::
https://www.caf.fr/: 94ms CPU time
Info::
Third-party scripts: 127ms (19% of total)

Main Thread Breakdown

Script Evaluation 42% Other 30% Style & Layout 14% Script Parsing & Compilation 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV9212ms80ms4ms1st
https://www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js147ms110ms24ms1st
Unattributable127ms3ms0ms3rd
https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js107ms99ms3ms1st
https://www.caf.fr/94ms2ms1ms1st
C
JS Bundles
Action
10 scripts, 169 KB unused
REVIEW
10 scripts, 169 KB unused
Warning::
https://www.caf.fr/sites/default/files/js/js_Nj8Lj...: 58 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe...: 40 KB unused (24%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.caf.fr/sites/default/files/js/js_hXm9K...: 38 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260...: 33 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 169 KB
169 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.caf.fr/sites/default/files/js/js_Nj8LjfMBzzVMczRmqLebZ_KcfWjLlrEaDsS2-PG2zcs.js?scope=footer&delta=1&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV985 KB58 KB (69%)✓1st
https://www.caf.fr/18f5227b-e27b-445a-a53f-f845fbe69b40/stormcaster.js165 KB40 KB (24%)✓1st
https://www.caf.fr/sites/default/files/js/js_hXm9K29ULpBHOsC2hvvvqSx4ZlH_gJUZNIEKIuvfJXA.js?scope=footer&delta=4&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV948 KB38 KB (80%)✓1st
https://www.caf.fr/ruxitagentjs_ICANVfqru_10333260303165926.js79 KB33 KB (41%)✓1st
https://www.caf.fr/sites/default/files/smarttag/smarttag-caffr.js32 KB—✓1st
https://www.caf.fr/sites/default/files/js/js_5iMT6fVeOjJwOXip3wAVWVZ01y2EouzYQp2g2SPU3us.js?scope=footer&delta=0&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV959 KB—✓1st
https://www.caf.fr/sites/default/files/js/js_o6G8qF50-szA3UP9Qpy_0v5TcqedxzRkm33_NPTih_c.js?scope=footer&delta=2&language=fr&theme=caf_bootstrap5&include=eJx9UNFuxCAM-6G2PO17UIC040oJCqG3-_tFvVur7dCeSGyj2HZEUoWhfBh3juOtjgkEqwweZgsSsyBnFPN7_Z-1PkW_1p7oQU2aw4O6zpolkYOk1_8S6scTrfHtx0mM2HTaSoqQfU82R_-JY2ENpWYodySFSisdvIrmeIyzgsgHvyAl8ub5HMiGuRn8KpADuITHfhE1xYD8AlcMUYgteE8c1Io5p2lm0p5yGBRAE7gVSBM0oSMbCg7Y7DOxveKaHjjEDRas9igevMQdq5afd6gWGMEGhntfRKlo4i7Xwbq6WtALt23gpYQfc7u2QOYNGe7oZuLNvN4pREi0fAMlEQV92 KB—✓1st
https://www.caf.fr/modules/contrib/ckeditor_accordion/js/accordion.frontend.min.js?tbhdli2 KB—✓1st
https://www.youtube.com/iframe_api3 KB—✓3rd
https://www.youtube.com/s/player/2430d1b0/www-widgetapi.vflset/www-widgetapi.js11 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

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+
Third-Party Impact
1% third-party, 0 ms blocking
PASS
1% third-party, 0 ms blocking
Info::
Third-party code accounts for 1% of page weight (14.0 KiB of 1.3 MiB)
Info::
Third-party blocking time is low (0 ms)
99%
First-party Third-party
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
6 fonts (98 KB)
PASS
6 fonts (98 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

98 KB total

Render-blocking

0

of 6

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 792 ms LCP 1.6 shttps://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-500.woff2roboto-v20-latin-500.woff2 https://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-500.woff2 — 16.2 KiB — 0 ms — font-display: swaphttps://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-900.woff2roboto-v20-latin-900.woff2 https://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-900.woff2 — 16.1 KiB — 0 ms — font-display: swaphttps://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-regular.woff2roboto-v20-latin-regula... https://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-regular.woff2 — 16.1 KiB — 0 ms — font-display: swaphttps://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-300.woff2roboto-v20-latin-300.woff2 https://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-300.woff2 — 16.1 KiB — 0 ms — font-display: swaphttps://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-700.woff2roboto-v20-latin-700.woff2 https://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-700.woff2 — 16.2 KiB — 0 ms — font-display: swaphttps://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-italic.woff2roboto-v20-latin-italic... https://www.caf.fr/themes/custom/caf_bootstrap5/fonts/roboto-v20-latin-italic.woff2 — 17.6 KiB — 0 ms — font-display: swap
roboto-v20-latin-500.woff2 woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-900.woff2 woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-regula... woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-300.woff2 woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-700.woff2 woff2 swap
Size 16 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
roboto-v20-latin-italic... woff2 swap
Size 18 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
67 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
19% of JavaScript execution is third-party
First-party Third-party 127ms · 0KB · €1/mo
Unattributable
Other
Optional
Execution 127ms
Transfer 0 KB
Monthly Cost €1/mo

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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