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https://ens.fr

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
33
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
79
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.

6.09 s

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

13.77 s

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

584 ms

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

0.185

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

9.66 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.

14.15 s

Page Load Progression

837 ms
1.7 s
2.5 s
3.3 s
4.2 s
5.0 s
5.9 s
6.7 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
4.4 MB transferred, 150 requests
FIX
4.4 MB transferred, 150 requests
Critical::
Page weighs 6.2 MB (4.4 MB transferred)
Warning::
Images are 1.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.9 MB
Info::
Fonts are 207 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 207 KB
Warning::
150 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.93 g CO2 per page load
4.4 MB / 2.4 MB budget
4.4 MB transferred
150 requests
0.93 g CO2 per page load
Other 1.9 MiB 43%
Images 1.9 MiB 42%
Fonts 207.3 KiB 5%
JavaScript 196.2 KiB 4%
HTML 124.5 KiB 3%
CSS 119.9 KiB 3%
Other 16.0 KiB 0%
Other 951 B 0%
Other 61 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (4.4 MiB of 4.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4481ms total JS execution
FIX
4481ms total JS execution
Warning::
https://www.ens.psl.eu/core/assets/vendor/jquery/j...: 1323ms CPU time
Warning::
https://platform.twitter.com/widgets.js: 1138ms CPU time
Warning::
Unattributable: 1071ms CPU time
Warning::
https://www.ens.psl.eu/: 509ms CPU time
Warning::
https://www.ens.psl.eu/core/misc/drupal.init.js?v=...: 256ms CPU time
Warning::
Third-party scripts: 4481ms (100% of total)

Main Thread Breakdown

Other 31% Style & Layout 31% Script Evaluation 28% Parse HTML & CSS 5% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.11323ms813ms13ms3rd
https://platform.twitter.com/widgets.js1138ms130ms17ms3rd
Unattributable1071ms36ms0ms3rd
https://www.ens.psl.eu/509ms17ms4ms3rd
https://www.ens.psl.eu/core/misc/drupal.init.js?v=10.6.5256ms97ms0ms3rd
https://stats-web.ens.psl.eu/matomo.js116ms74ms33ms3rd
https://platform.twitter.com/js/timeline.e108540dddc96e4b707f5cf259a582d7.js70ms65ms2ms3rd
D
Page Weight Inventory
Action
150 resources · 4.4 MB · 0 KB savings available
FIX
150 resources · 4.4 MB · 0 KB savings available
Warning::
Page weight 3.4 MB over 1MB target
Got: 4.4 MB Expected: ≤ 1 MB
Warning::
149 third-party resources (100% of weight)
Info::
2 resources over 200KB
150 resources · 4.4 MiB · 149 third-party 3.4 MiB over 1MB target
Media 43% · 1.9 MiB
Image 42% · 1.9 MiB
Font 5% · 207.3 KiB
JavaScript 4% · 196.2 KiB
Document 3% · 124.6 KiB
CSS 3% · 119.9 KiB
Other 0% · 1012 B
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
Image Optimization
Action
56 images, 0 KB saveable
REVIEW
56 images, 0 KB saveable
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... 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.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/sites/default/files/styles/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
56 images 1.9 MB
0 oversized -0 KB
52 legacy format
36 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

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

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

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

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

Green Hosting

No green hosting detected

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
7 fonts (207 KB)
PASS
7 fonts (207 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

207 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 6.1 s LCP 13.8 shttps://fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJXsCxGDNNQ9rJPfw.woff2wlppgwHKFkZgtmSR3NB0oRJ... https://fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJXsCxGDNNQ9rJPfw.woff2 — 16.9 KiB — 25 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.8/dist/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.8/dist/fonts/glyphicons-halflings-regular.woff2 — 18.0 KiB — 30 ms — font-display: swaphttps://fonts.gstatic.com/s/crimsontext/v19/wlprgwHKFkZgtmSR3NB0oRJfajCOD-NS_LVtfaKv.woff2wlprgwHKFkZgtmSR3NB0oRJ... https://fonts.gstatic.com/s/crimsontext/v19/wlprgwHKFkZgtmSR3NB0oRJfajCOD-NS_LVtfaKv.woff2 — 16.8 KiB — 33 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.6.0/webfonts/fa-brands-400.woff2 — 116.0 KiB — 51 ms — font-display: swaphttps://fonts.gstatic.com/s/crimsontext/v19/wlp2gwHKFkZgtmSR3NB0oRJfbwhTIfFd3A.woff2wlp2gwHKFkZgtmSR3NB0oRJ... https://fonts.gstatic.com/s/crimsontext/v19/wlp2gwHKFkZgtmSR3NB0oRJfbwhTIfFd3A.woff2 — 16.4 KiB — 34 ms — font-display: swaphttps://fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJX1C1GDNNQ9rJPfw.woff2wlppgwHKFkZgtmSR3NB0oRJ... https://fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJX1C1GDNNQ9rJPfw.woff2 — 16.1 KiB — 50 ms — font-display: swaphttps://www.ens.psl.eu/themes/ens/font/fontello.woff2?46225747fontello.woff2 https://www.ens.psl.eu/themes/ens/font/fontello.woff2?46225747 — 7.1 KiB — 23 ms — font-display: swap
wlppgwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 17 KB
Load time 25 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 30 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
wlprgwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 17 KB
Load time 33 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 51 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
wlp2gwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 16 KB
Load time 34 ms
Start 1.8 s
Risk FOUT — text flashes from fallback to web font
wlppgwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 16 KB
Load time 50 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
fontello.woff2 woff2 swap
Size 7 KB
Load time 23 ms
Start 3.3 s
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)

Fixing the unchecked items could save ~58 KB and ~116 ms

A+
JS Bundles
30 scripts, 0 KB unused
PASS
30 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ens.psl.eu/sites/default/files/hotjar/hotjar.script.js?tbsiin0 KB—✓3rd
https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.130 KB—✓3rd
https://www.ens.psl.eu/core/assets/vendor/underscore/underscore-min.js?v=1.13.77 KB—✓3rd
https://www.ens.psl.eu/core/assets/vendor/once/once.min.js?v=1.0.11 KB—✓3rd
https://www.ens.psl.eu/sites/default/files/languages/fr_T3DzjFe-7GrLMKiX0EBkcIxiA29_GK5xWzfLXC2VONo.js?tbsiin5 KB—✓3rd
https://www.ens.psl.eu/core/misc/drupalSettingsLoader.js?v=10.6.50 KB—✓3rd
https://www.ens.psl.eu/core/misc/drupal.js?v=10.6.56 KB—✗3rd
https://www.ens.psl.eu/core/misc/drupal.init.js?v=10.6.51 KB—✓3rd
https://www.ens.psl.eu/themes/bootstrap/js/bootstrap-pre-init.js?tbsiin0 KB—✓3rd
https://cdn.jsdelivr.net/npm/entreprise7pro-bootstrap@3.4.8/dist/js/bootstrap.js17 KB—✓3rd
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
Network Waterfall
150 requests over 4352ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 6.1 s LCP 13.8 shttps://ens.fr// https://ens.fr/ — 301 — 123 B — 64 ms — h2https://www.ens.psl.eu/www.ens.psl.eu/ https://www.ens.psl.eu/ — 200 — 20.6 KiB — 110 ms — h2https://www.ens.psl.eu/sites/default/files/hotjar/hotjar.script.js?tbsiinwww.ens.psl.eu/sites/default/files/... https://www.ens.psl.eu/sites/default/files/hotjar/hotjar.script.js?tbsiin — 200 — 404 B — 1.3 s — h2https://www.ens.psl.eu/core/assets/vendor/normalize-css/normalize.css?tbsiinwww.ens.psl.eu/core/assets/vendor/n... https://www.ens.psl.eu/core/assets/vendor/normalize-css/normalize.css?tbsiin — 200 — 1.8 KiB — 87 ms — h2https://www.ens.psl.eu/core/modules/system/css/components/align.module.css?tbsiinwww.ens.psl.eu/core/modules/system/... https://www.ens.psl.eu/core/modules/system/css/components/align.module.css?tbsiin — 200 — 355 B — 70 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
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 4481ms · 103KB · €49/mo
www.ens.psl.eu
Other
Costly
Execution 1323ms
Transfer 30 KB
Monthly Cost €14/mo
Twitter/X Embed
Social
Costly
Execution 1138ms
Transfer 27 KB
Monthly Cost €12/mo
Unattributable
Other
Costly
Execution 1071ms
Transfer 0 KB
Monthly Cost €12/mo
www.ens.psl.eu
Other
Costly
Execution 509ms
Transfer 21 KB
Monthly Cost €6/mo
www.ens.psl.eu
Other
Costly
Execution 256ms
Transfer 1 KB
Monthly Cost €3/mo
stats-web.ens.psl.eu
Other
Optional
Execution 116ms
Transfer 22 KB
Monthly Cost €1/mo
Twitter/X Embed
Social
Optional
Execution 70ms
Transfer 3 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.ens.psl.eu adds 1323ms and costs ~€14/month
  • Twitter/X Embed adds 1138ms and costs ~€12/month
  • Unattributable adds 1071ms and costs ~€12/month
  • www.ens.psl.eu adds 509ms and costs ~€6/month
  • www.ens.psl.eu adds 256ms and costs ~€3/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.ens.psl.eu takes 1323ms 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

Twitter/X Embed takes 1138ms 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 1071ms 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.ens.psl.eu takes 509ms 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.ens.psl.eu takes 256ms 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

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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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