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https://lemonde.fr

Performance

· 16 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
3
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
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.

4.78 s

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

7.00 s

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

116 ms

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

0.000

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

4.78 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.

7.83 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
10 PASS 1 REVIEW 3 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 (826.1 KiB of 826.3 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2011ms total JS execution
FIX
2011ms total JS execution
Warning::
https://www.lemonde.fr/en/: 564ms CPU time
Warning::
https://www.lemonde.fr/en/bucket/resources/english...: 554ms CPU time
Warning::
Unattributable: 381ms CPU time
Info::
https://cmp.lemonde.fr/js/lemonde-en.min.js: 243ms CPU time
Info::
https://www.lemonde.fr/en/bucket/resources/english...: 128ms CPU time
Warning::
Third-party scripts: 2011ms (100% of total)

Main Thread Breakdown

Style & Layout 35% Script Evaluation 28% Other 21% Script Parsing & Compilation 7% Parse HTML & CSS 5% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.lemonde.fr/en/564ms56ms6ms3rd
https://www.lemonde.fr/en/bucket/resources/english/js/common.763e7aa371b4c6d9.js554ms147ms39ms3rd
Unattributable381ms37ms0ms3rd
https://cmp.lemonde.fr/js/lemonde-en.min.js243ms87ms50ms3rd
https://www.lemonde.fr/en/bucket/resources/english/640270c4449461f3.2490cffb4c967e8c01bf4cc824310b95f0272b59.js128ms117ms7ms3rd
https://www.lemonde.fr/en/bucket/resources/english/js/home.8c9eed587f86d247.js75ms58ms17ms3rd
https://www.lemonde.fr/en/bucket/resources/english/03ea4fa719e85114.2490cffb4c967e8c01bf4cc824310b95f0272b59.2490cffb4c967e8.js66ms55ms10ms3rd
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.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Page Weight Budget
826 KB transferred, 64 requests
PASS
826 KB transferred, 64 requests
Info::
Page weighs 2.2 MB (826 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 220 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 220 KB
Info::
64 HTTP requests
Info::
Estimated 0.17 g CO2 per page load
826 KB / 2.4 MB budget
826 KB transferred
64 requests
0.17 g CO2 per page load
Fonts 296.9 KiB 36%
CSS 220.1 KiB 27%
JavaScript 186.8 KiB 23%
Images 56.6 KiB 7%
HTML 44.3 KiB 5%
Other 8.9 KiB 1%
Other 8.5 KiB 1%
Other 2.9 KiB 0%
Other 1.1 KiB 0%
Other 151 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+
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
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 57 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.8 s LCP 7.0 shttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans/MarrSans-Medium-Web.ac7bf37b26f16e97.woff2MarrSans-Medium-Web.ac7... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans/MarrSans-Medium-Web.ac7bf37b26f16e97.woff2 — 32.4 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans-cond/MarrSansCondensed-Medium-Web.133dea79c01db68e.woff2MarrSansCondensed-Mediu... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans-cond/MarrSansCondensed-Medium-Web.133dea79c01db68e.woff2 — 39.4 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde.b353d5d190089f96.woff2TheAntiquaB-LeMonde.b35... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde.b353d5d190089f96.woff2 — 40.7 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans/MarrSans-Semibold-Web.f7d5c05af8370693.woff2MarrSans-Semibold-Web.f... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans/MarrSans-Semibold-Web.f7d5c05af8370693.woff2 — 32.1 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans-cond/MarrSansCondensed-Semibold-Web.22ed62e40765ed70.woff2MarrSansCondensed-Semib... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans-cond/MarrSansCondensed-Semibold-Web.22ed62e40765ed70.woff2 — 39.6 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans-cond/MarrSansCondensed-Bold-Web.07e8c5aa145a2514.woff2MarrSansCondensed-Bold-... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans-cond/MarrSansCondensed-Bold-Web.07e8c5aa145a2514.woff2 — 39.6 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans/MarrSans-Regular-Web.2f89fff3877253bf.woff2MarrSans-Regular-Web.2f... https://www.lemonde.fr/en/bucket/resources/english/front/fonts/marr-sans/MarrSans-Regular-Web.2f89fff3877253bf.woff2 — 31.2 KiB — 0 ms — font-display: swaphttps://www.lemonde.fr/en/bucket/resources/english/front/fonts/variables/the-antiqua-b/TheAntiquaB-LeMonde-Italic.a9ec17f6e3f905ea.woff2TheAntiquaB-LeMonde-Ita... https://www.lemonde.fr/en/bucket/resources/english/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-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-Semib... woff2 swap
Size 40 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
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
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, 23 KB unused
PASS
12 scripts, 23 KB unused
Warning::
https://www.lemonde.fr/en/bucket/resources/english...: 23 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 23 KB
23 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.lemonde.fr/en/bucket/resources/english/js/common.763e7aa371b4c6d9.js38 KB23 KB (61%)✓3rd
https://cmp.lemonde.fr/js/lemonde-en.min.js41 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/js/vendor.3aee036b216e2a97.js2 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/js/batch_load.7e7c6e51a1c07e71.js0 KB—✓3rd
https://applets.ebxcdn.com/ebx.js1 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/js/home.8c9eed587f86d247.js27 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/640270c4449461f3.2490cffb4c967e8c01bf4cc824310b95f0272b59.js17 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/js/forecast.d2fd0354c12819be.js10 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/ca618854ca95a48e.2490cffb4c967e8c01bf4cc824310b95f0272b59.43260.js25 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/03ea4fa719e85114.2490cffb4c967e8c01bf4cc824310b95f0272b59.2490cffb4c967e8.js25 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

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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
1
preload
3
dns-prefetch
—
prefetch
—

4 resource hints configured

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
Network Waterfall
64 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
100% of JavaScript execution is third-party
First-party Third-party 2011ms · 191KB · €8/mo
www.lemonde.fr
Other
Costly
Execution 564ms
Transfer 43 KB
Monthly Cost €2/mo
www.lemonde.fr
Other
Costly
Execution 554ms
Transfer 38 KB
Unused 61%
Monthly Cost €2/mo
Unattributable
Other
Costly
Execution 381ms
Transfer 0 KB
Monthly Cost €2/mo
cmp.lemonde.fr
Other
Costly
Execution 243ms
Transfer 41 KB
Monthly Cost €1/mo
www.lemonde.fr
Other
Optional
Execution 128ms
Transfer 17 KB
Monthly Cost €1/mo
www.lemonde.fr
Other
Optional
Execution 75ms
Transfer 27 KB
Monthly Cost €0/mo
www.lemonde.fr
Other
Optional
Execution 66ms
Transfer 25 KB
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.lemonde.fr adds 564ms and costs ~€2/month
  • www.lemonde.fr adds 554ms and costs ~€2/month
  • Unattributable adds 381ms and costs ~€2/month
  • cmp.lemonde.fr adds 243ms and costs ~€1/month

100% 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.lemonde.fr takes 564ms 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

www.lemonde.fr takes 554ms 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

61% of www.lemonde.fr's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

Unattributable takes 381ms 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

cmp.lemonde.fr takes 243ms 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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