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https://lemonde.fr

Performance

· 14 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
90
GRADE
A
FIX
2
REVIEW
1
PASS
9
INFO
2

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

Mobile Desktop
79
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
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.

1.76 s

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

2.33 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.

0.003

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

1.85 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.

2.33 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 1 REVIEW 2 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 (877.5 KiB of 877.7 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
878 KB transferred, 69 requests
PASS
878 KB transferred, 69 requests
Info::
Page weighs 2.2 MB (878 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::
69 HTTP requests
Info::
Estimated 0.18 g CO2 per page load
878 KB / 2.4 MB budget
878 KB transferred
69 requests
0.18 g CO2 per page load
Fonts 297.0 KiB 34%
CSS 220.2 KiB 25%
JavaScript 186.9 KiB 21%
Images 107.7 KiB 12%
HTML 44.4 KiB 5%
Other 8.8 KiB 1%
Other 8.6 KiB 1%
Other 2.9 KiB 0%
Other 1.1 KiB 0%
Other 94 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
19 images, 0 KB saveable
PASS
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 108 KB
0 oversized -0 KB
0 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
451ms total JS execution
PASS
451ms total JS execution
Warning::
https://www.lemonde.fr/en/: 309ms CPU time
Info::
Unattributable: 90ms CPU time
Info::
https://www.lemonde.fr/en/bucket/resources/english...: 52ms CPU time
Warning::
Third-party scripts: 451ms (100% of total)

Main Thread Breakdown

Style & Layout 44% Script Evaluation 25% Other 19% Parse HTML & CSS 4% Rendering 4% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.lemonde.fr/en/309ms15ms2ms3rd
Unattributable90ms9ms0ms3rd
https://www.lemonde.fr/en/bucket/resources/english/js/common.763e7aa371b4c6d9.js52ms34ms4ms3rd
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 1.5 s 2.0 s FCP 1.8 s LCP 2.3 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 — 32.0 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 — 39.7 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 — 42.0 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 (60%)
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 (60%)✓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://applets.ebxcdn.com/applets/www.lemonde.fr/scripts.js3 KB—✓3rd
https://www.lemonde.fr/en/bucket/resources/english/ca618854ca95a48e.2490cffb4c967e8c01bf4cc824310b95f0272b59.43260.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
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
100% of JavaScript execution is third-party
First-party Third-party 451ms · 81KB · €2/mo
www.lemonde.fr
Other
Costly
Execution 309ms
Transfer 43 KB
Monthly Cost €1/mo
Unattributable
Other
Optional
Execution 90ms
Transfer 0 KB
Monthly Cost €0/mo
www.lemonde.fr
Other
Optional
Execution 52ms
Transfer 38 KB
Unused 60%
Monthly Cost €0/mo

These scripts may cost more than they're worth

  • www.lemonde.fr adds 309ms 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 309ms 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

60% 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

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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