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https://www.ameli.fr

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
91
GRADE
A
FIX
0
REVIEW
2
PASS
10
INFO
2

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

Mobile Desktop
98
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.
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.

584 ms

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

805 ms

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

18 ms

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

0.067

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

584 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.05 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
14
10 PASS 2 REVIEW
C
Image Optimization
Action
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Warning::
https://www.ameli.fr/sites/default/files/2024-02/l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/thumbnail... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/2023-09/X... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ameli.fr/sites/default/files/2023-09/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/2025-04/B... 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.
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::
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.
26 images 202 KB
0 oversized -0 KB
12 legacy format
15 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

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

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 Bundles
14 scripts, 133 KB unused
REVIEW
14 scripts, 133 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-53Z...: 67 KB unused (43%)
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: 133 KB
133 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-53ZCDGR154 KB67 KB (43%)✓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-LVbavQvvAE1elwR52 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
654 KB transferred, 49 requests
PASS
654 KB transferred, 49 requests
Info::
Page weighs 2.0 MB (654 KB transferred)
Info::
49 HTTP requests
Info::
Estimated 0.13 g CO2 per page load
654 KB / 2.4 MB budget
654 KB transferred
49 requests
0.13 g CO2 per page load
JavaScript 340.7 KiB 52%
Images 202.0 KiB 31%
CSS 77.2 KiB 12%
HTML 19.4 KiB 3%
Fonts 5.9 KiB 1%
Other 5.2 KiB 1%
Other 3.1 KiB 0%
Other 325 B 0%
Other 21 B 0%
0 2.4 MB 4.9 MB
Under budget
A
Third-Party Impact
28% third-party, 0 ms blocking
PASS
28% third-party, 0 ms blocking
Info::
Third-party code accounts for 28% of page weight (183.0 KiB of 653.7 KiB)
Info::
Third-party blocking time is low (0 ms)
72%
28%
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+
JS Execution Cost
476ms total JS execution
PASS
476ms total JS execution
Info::
https://www.ameli.fr/sites/default/files/js/js_Z7n...: 138ms CPU time
Info::
https://www.ameli.fr/: 121ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-53Z...: 112ms CPU time
Info::
Unattributable: 106ms CPU time
Info::
Third-party scripts: 218ms (46% of total)

Main Thread Breakdown

Script Evaluation 48% Other 19% Style & Layout 15% Script Parsing & Compilation 9% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
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-LVbavQvvAE1elwR138ms106ms6ms1st
https://www.ameli.fr/121ms7ms0ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-53ZCDGR112ms92ms19ms3rd
Unattributable106ms6ms0ms3rd
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 500 ms 1.0 s FCP 584 ms LCP 805 mshttps://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+
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
49 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
46% of JavaScript execution is third-party
First-party Third-party 218ms · 154KB · €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 112ms
Transfer 154 KB
Unused 43%
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 106ms
Transfer 0 KB
Monthly Cost €1/mo

46% 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

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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