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https://www.lemonde.fr

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
0
REVIEW
3
PASS
9
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.
89
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.
92
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.

685 ms

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

1.11 s

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

0 ms

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

0.002

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

861 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.

1.11 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
9 PASS 3 REVIEW
B
JS Execution Cost
540ms total JS execution
REVIEW
540ms total JS execution
Warning::
https://www.lemonde.fr/: 367ms CPU time
Info::
Unattributable: 117ms CPU time
Info::
https://www.lemonde.fr/bucket/resources/front/js/c...: 56ms CPU time
Info::
Third-party scripts: 117ms (22% of total)

Main Thread Breakdown

Style & Layout 41% Script Evaluation 26% Other 19% Parse HTML & CSS 4% Rendering 4% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.lemonde.fr/367ms29ms2ms1st
Unattributable117ms11ms0ms3rd
https://www.lemonde.fr/bucket/resources/front/js/common.4cffe894c125a193.js56ms29ms4ms1st
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
private, must-revalidate, max-age=0
REVIEW
private, must-revalidate, max-age=0
Info::
Cache-Control header is set
Got: private, must-revalidate, max-age=0
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

private, must-revalidate, max-age=0

DirectiveValueMeaning
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
max-age0Cache for 0 seconds
A
Page Weight Budget
909 KB transferred, 69 requests
PASS
909 KB transferred, 69 requests
Info::
Page weighs 2.5 MB (909 KB transferred)
Info::
Fonts are 297 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 297 KB
Info::
CSS is 236 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 236 KB
Info::
69 HTTP requests
Info::
Estimated 0.19 g CO2 per page load
909 KB / 2.4 MB budget
909 KB transferred
69 requests
0.19 g CO2 per page load
Fonts 296.9 KiB 33%
CSS 236.3 KiB 26%
JavaScript 204.0 KiB 22%
Images 81.2 KiB 9%
HTML 69.4 KiB 8%
Other 9.5 KiB 1%
Other 8.1 KiB 1%
Other 2.9 KiB 0%
Other 1.1 KiB 0%
Other 95 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under budget

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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

A+
Third-Party Impact
16% third-party, 0 ms blocking
PASS
16% third-party, 0 ms blocking
Info::
Third-party code accounts for 16% of page weight (143.9 KiB of 909.4 KiB)
Info::
Third-party blocking time is low (0 ms)
84%
16%
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+
Image Optimization
16 images, 0 KB saveable
PASS
16 images, 0 KB saveable
Info::
All images are well-optimized
16 images 81 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
Font Loading
8 fonts (297 KB)
PASS
8 fonts (297 KB)
Info::
8 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

8

297 KB total

Render-blocking

0

of 8

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 685 ms LCP 1.1 shttps://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans/MarrSans-Medium-Web.ac7bf37b26f16e97.woff2MarrSans-Medium-Web.ac7... https://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans/MarrSans-Medium-Web.ac7bf37b26f16e97.woff2 — 32.3 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans-cond/MarrSansCondensed-Medium-Web.133dea79c01db68e.woff2MarrSansCondensed-Mediu... https://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans-cond/MarrSansCondensed-Medium-Web.133dea79c01db68e.woff2 — 39.4 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde.b353d5d190089f96.woff2TheAntiquaB-LeMonde.b35... https://www.lemonde.fr/bucket/resources/front/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde.b353d5d190089f96.woff2 — 40.8 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans/MarrSans-Regular-Web.2f89fff3877253bf.woff2MarrSans-Regular-Web.2f... https://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans/MarrSans-Regular-Web.2f89fff3877253bf.woff2 — 31.2 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans-cond/MarrSansCondensed-Semibold-Web.22ed62e40765ed70.woff2MarrSansCondensed-Semib... https://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans-cond/MarrSansCondensed-Semibold-Web.22ed62e40765ed70.woff2 — 39.7 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans/MarrSans-Semibold-Web.f7d5c05af8370693.woff2MarrSans-Semibold-Web.f... https://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans/MarrSans-Semibold-Web.f7d5c05af8370693.woff2 — 32.1 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans-cond/MarrSansCondensed-Bold-Web.07e8c5aa145a2514.woff2MarrSansCondensed-Bold-... https://www.lemonde.fr/bucket/resources/front/front/fonts/marr-sans-cond/MarrSansCondensed-Bold-Web.07e8c5aa145a2514.woff2 — 39.5 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/bucket/resources/front/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde-Italic.a9ec17f6e3f905ea.woff2TheAntiquaB-LeMonde-Ita... https://www.lemonde.fr/bucket/resources/front/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde-Italic.a9ec17f6e3f905ea.woff2 — 41.9 KiB — 0 ms — font-display: swap
MarrSans-Medium-Web.ac7... woff2 swap
Size 32 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarrSansCondensed-Mediu... woff2 swap
Size 39 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TheAntiquaB-LeMonde.b35... woff2 swap
Size 41 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarrSans-Regular-Web.2f... woff2 swap
Size 31 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarrSansCondensed-Semib... woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarrSans-Semibold-Web.f... woff2 swap
Size 32 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
MarrSansCondensed-Bold-... woff2 swap
Size 40 KB
Load time 0 ms
Start 0 ms
Risk FOUT — text flashes from fallback to web font
TheAntiquaB-LeMonde-Ita... woff2 swap
Size 42 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+
JS Bundles
12 scripts, 45 KB unused
PASS
12 scripts, 45 KB unused
Warning::
https://www.lemonde.fr/bucket/resources/front/js/c...: 23 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lemonde.fr/bucket/resources/front/js/h...: 21 KB unused (66%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 45 KB
45 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.lemonde.fr/bucket/resources/front/js/common.4cffe894c125a193.js40 KB23 KB (59%)✓1st
https://www.lemonde.fr/bucket/resources/front/js/home.11d1729d46f60f0e.js33 KB21 KB (66%)✓1st
https://cmp.lemonde.fr/js/lemonde.min.js48 KB—✓3rd
https://www.lemonde.fr/bucket/resources/front/js/vendor.3aee036b216e2a97.js2 KB—✓1st
https://www.lemonde.fr/bucket/resources/front/js/batch_load.7e7c6e51a1c07e71.js1 KB—✓1st
https://applets.ebxcdn.com/ebx.js1 KB—✓3rd
https://www.lemonde.fr/bucket/resources/front/96cb949ce39c9212.fb257ea3de19e0ff3ce52a6d43ff448cdad3ffd8.js20 KB—✓1st
https://www.lemonde.fr/bucket/resources/front/js/forecast.ab75835444be58f0.js11 KB—✓1st
https://www.lemonde.fr/bucket/resources/front/ca618854ca95a48e.fb257ea3de19e0ff3ce52a6d43ff448cdad3ffd8.43260.js25 KB—✓1st
https://www.lemonde.fr/bucket/resources/front/03ea4fa719e85114.fb257ea3de19e0ff3ce52a6d43ff448cdad3ffd8.fb257ea3de19e0f.js25 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

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
69 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
22% of JavaScript execution is third-party
First-party Third-party 117ms · 0KB · €0/mo
Unattributable
Other
Optional
Execution 117ms
Transfer 0 KB
Monthly Cost €0/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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