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https://www.ameli.fr

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
0
REVIEW
3
PASS
11
INFO
2

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

Mobile Desktop
76
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.
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.

2.06 s

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

3.41 s

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

473 ms

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

0.089

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

2.06 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.

4.86 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
16
11 PASS 3 REVIEW
B
Image Optimization
14 images, 0 KB saveable
REVIEW
14 images, 0 KB saveable
Warning::
https://www.ameli.fr/sites/default/files/styles/bu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/2024-06/p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/styles/bu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/styles/bu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/styles/bu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/styles/bu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/themes/custom/ameli_v2/librar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
14 images 94 KB
0 oversized -0 KB
3 legacy format
8 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

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

Performance issues directly impact user engagement and conversion rates.

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

C
JS Execution Cost
Action
1983ms total JS execution
REVIEW
1983ms total JS execution
Warning::
https://www.ameli.fr/: 480ms CPU time
Warning::
https://www.ameli.fr/sites/default/files/js/js_Z7n...: 422ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53Z...: 414ms CPU time
Warning::
Unattributable: 323ms CPU time
Info::
https://tag.aticdn.net/piano-analytics.js: 123ms CPU time
Info::
Third-party scripts: 860ms (43% of total)

Main Thread Breakdown

Script Evaluation 47% Other 18% Style & Layout 17% Script Parsing & Compilation 9% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://www.ameli.fr/480ms22ms1ms1st
https://www.ameli.fr/sites/default/files/js/js_Z7nDxzfPkavhZOvYytrDEZHl_lkHqhcVMuQRmh4M0SY.js?scope=footer&delta=1&language=fr&theme=ameli_v2&include=eJx9jVEOwjAMQy80LRIXikwXRRlpU60FjduDgMHgg584z7ZkZHFjaRVJ6CkDHp5HgltDtyi0hzHHBH-1YpHZslCWcma3cuJ9ejmQehzfvFo3-ryDRqgLdyjp_fzyiBnrt5mHReu0zXI1lGAU-LVbavQvvAE1elwR422ms307ms25ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-53ZCDGR414ms341ms71ms3rd
Unattributable323ms23ms0ms3rd
https://tag.aticdn.net/piano-analytics.js123ms105ms16ms3rd
https://www.ameli.fr/core/assets/vendor/jquery/jquery.min.js?v=4.0.0116ms88ms14ms1st
https://www.ameli.fr/sites/default/files/js/js_78rh9FdRnWGLxOBVIHfyU8RK6e6vwc9QXlMOxtQ6T-s.js?scope=footer&delta=5&language=fr&theme=ameli_v2&include=eJx9jVEOwjAMQy80LRIXikwXRRlpU60FjduDgMHgg584z7ZkZHFjaRVJ6CkDHp5HgltDtyi0hzHHBH-1YpHZslCWcma3cuJ9ejmQehzfvFo3-ryDRqgLdyjp_fzyiBnrt5mHReu0zXI1lGAU-LVbavQvvAE1elwR55ms25ms29ms1st
https://www.ameli.fr/libraries/orejime/dist/orejime.js?v=2.3.151ms25ms13ms1st
B
JS Bundles
14 scripts, 134 KB unused
REVIEW
14 scripts, 134 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53Z...: 67 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ameli.fr/sites/default/files/js/js_78r...: 46 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.ameli.fr/sites/default/files/js/js_Z7n...: 21 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 134 KB
134 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-53ZCDGR154 KB67 KB (44%)✓3rd
https://www.ameli.fr/sites/default/files/js/js_78rh9FdRnWGLxOBVIHfyU8RK6e6vwc9QXlMOxtQ6T-s.js?scope=footer&delta=5&language=fr&theme=ameli_v2&include=eJx9jVEOwjAMQy80LRIXikwXRRlpU60FjduDgMHgg584z7ZkZHFjaRVJ6CkDHp5HgltDtyi0hzHHBH-1YpHZslCWcma3cuJ9ejmQehzfvFo3-ryDRqgLdyjp_fzyiBnrt5mHReu0zXI1lGAU-LVbavQvvAE1elwR51 KB46 KB (89%)✓1st
https://www.ameli.fr/sites/default/files/js/js_Z7nDxzfPkavhZOvYytrDEZHl_lkHqhcVMuQRmh4M0SY.js?scope=footer&delta=1&language=fr&theme=ameli_v2&include=eJx9jVEOwjAMQy80LRIXikwXRRlpU60FjduDgMHgg584z7ZkZHFjaRVJ6CkDHp5HgltDtyi0hzHHBH-1YpHZslCWcma3cuJ9ejmQehzfvFo3-ryDRqgLdyjp_fzyiBnrt5mHReu0zXI1lGAU-LVbavQvvAE1elwR33 KB21 KB (63%)✓1st
https://www.ameli.fr/modules/contrib/google_tag/js/gtag.js?tc5pic1 KB—✓1st
https://www.ameli.fr/modules/contrib/google_tag/js/gtm.js?tc5pic1 KB—✓1st
https://www.ameli.fr/core/assets/vendor/jquery/jquery.min.js?v=4.0.027 KB—✓1st
https://tag.aticdn.net/piano-analytics.js27 KB—✓3rd
https://cdn.jsdelivr.net/npm/js-cookie@3.0.5/dist/js.cookie.min.js2 KB—✓3rd
https://www.ameli.fr/sites/default/files/js/js_WDA-eTLSY5dmWByNmllg5LAAykWnhfgR0QZzu1wGKOY.js?scope=footer&delta=3&language=fr&theme=ameli_v2&include=eJx9jVEOwjAMQy80LRIXikwXRRlpU60FjduDgMHgg584z7ZkZHFjaRVJ6CkDHp5HgltDtyi0hzHHBH-1YpHZslCWcma3cuJ9ejmQehzfvFo3-ryDRqgLdyjp_fzyiBnrt5mHReu0zXI1lGAU-LVbavQvvAE1elwR4 KB—✓1st
https://www.ameli.fr/modules/custom/ameli_menu/js/ameli_menu_update.min.js?v=1.0.21 KB—✓1st

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

A+
Page Weight Budget
546 KB transferred, 36 requests
PASS
546 KB transferred, 36 requests
Info::
Page weighs 1.9 MB (546 KB transferred)
Info::
36 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
546 KB / 2.4 MB budget
546 KB transferred
36 requests
0.11 g CO2 per page load
JavaScript 340.7 KiB 62%
Images 94.0 KiB 17%
CSS 77.2 KiB 14%
HTML 19.4 KiB 4%
Fonts 5.9 KiB 1%
Other 5.2 KiB 1%
Other 3.1 KiB 1%
Other 326 B 0%
Other 21 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
34% third-party, 0 ms blocking
PASS
34% third-party, 0 ms blocking
Info::
Third-party code accounts for 34% of page weight (183.0 KiB of 545.7 KiB)
Info::
Third-party blocking time is low (0 ms)
66%
34%
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
1 fonts (6 KB)
PASS
1 fonts (6 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

6 KB total

Render-blocking

0

of 1

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 2.1 s LCP 3.4 shttps://www.ameli.fr/themes/custom/ameli_v2/libraries/dist/fonts/ameli-icons/ameli-icons.woff2?plpl=ameli-icons.woff2 https://www.ameli.fr/themes/custom/ameli_v2/libraries/dist/fonts/ameli-icons/ameli-icons.woff2?plpl= — 5.9 KiB — 0 ms — font-display: swap
ameli-icons.woff2 woff2 swap
Size 6 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
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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

A+
HTTP Caching
max-age=86400 (1 day)
PASS
max-age=86400 (1 day)
Info::
Cache-Control header is set
Got: max-age=86400, public
Info::
Effective TTL: 1 day (max-age=86400)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=86400, public

DirectiveValueMeaning
max-age86400Cache for 1 day
public—Any cache may store this response
Effective TTL: 86400 seconds
Network Waterfall
36 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
43% of JavaScript execution is third-party
First-party Third-party 860ms · 181KB · €9/mo
Google Tag Manager
Tag Manager
Costly
Execution 414ms
Transfer 154 KB
Unused 44%
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 323ms
Transfer 0 KB
Monthly Cost €4/mo
tag.aticdn.net
Other
Optional
Execution 123ms
Transfer 27 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 414ms and costs ~€4/month
  • Unattributable adds 323ms and costs ~€4/month

43% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Google Tag Manager takes 414ms 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 323ms 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

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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