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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
81
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
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.

1.20 s

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

1.94 s

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

11 ms

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

0.068

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

2.82 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.

1.97 s

Page Load Progression

807 ms
1.6 s
2.4 s
3.2 s
4.0 s
4.8 s
5.6 s
6.5 s
Checks
15
6 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
5.5 MB transferred, 154 requests
FIX
5.5 MB transferred, 154 requests
Critical::
Page weighs 6.8 MB (5.5 MB transferred)
Warning::
Images are 2.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.7 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::
154 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.5 MB / 2.4 MB budget
5.5 MB transferred
154 requests
1.2 g CO2 per page load
Images 2.7 MiB 48%
Other 2.2 MiB 40%
Fonts 207.2 KiB 4%
JavaScript 196.2 KiB 3%
HTML 124.4 KiB 2%
CSS 119.9 KiB 2%
Other 16.0 KiB 0%
Other 948 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 (5.5 MiB of 5.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
154 resources · 5.5 MB · 0 KB savings available
FIX
154 resources · 5.5 MB · 0 KB savings available
Warning::
Page weight 4.5 MB over 1MB target
Got: 5.5 MB Expected: ≤ 1 MB
Warning::
153 third-party resources (100% of weight)
Info::
5 resources over 200KB
154 resources · 5.5 MiB · 153 third-party 4.5 MiB over 1MB target
Image 48% · 2.7 MiB
Media 40% · 2.2 MiB
Font 4% · 207.2 KiB
JavaScript 3% · 196.2 KiB
Document 2% · 124.6 KiB
CSS 2% · 119.9 KiB
Other 0% · 1009 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
60 images, 0 KB saveable
REVIEW
60 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::
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/themes/ens/images/alumni_lo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/themes/ens/images/fondation... 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/themes/ens/images/savoirs_l... 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/themes/ens/images/bibliotuq... 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/themes/ens/images/psl_logo.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/themes/ens/images/edition_l... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ens.psl.eu/themes/ens/images/institut_... 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.
60 images 2.7 MB
0 oversized -0 KB
56 legacy format
43 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

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

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

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
JS Execution Cost
Action
1055ms total JS execution
REVIEW
1055ms total JS execution
Warning::
https://www.ens.psl.eu/core/assets/vendor/jquery/j...: 423ms CPU time
Warning::
https://www.ens.psl.eu/: 351ms CPU time
Warning::
Unattributable: 281ms CPU time
Warning::
Third-party scripts: 1055ms (100% of total)

Main Thread Breakdown

Other 33% Style & Layout 26% Script Evaluation 26% Parse HTML & CSS 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.ens.psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1423ms207ms3ms3rd
https://www.ens.psl.eu/351ms7ms1ms3rd
Unattributable281ms8ms0ms3rd
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 1.0 s 2.0 s 3.0 s FCP 1.2 s LCP 1.9 shttps://www.ens.psl.eu/themes/ens/font/fontello.woff2?46225747fontello.woff2 https://www.ens.psl.eu/themes/ens/font/fontello.woff2?46225747 — 7.0 KiB — 28 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 — 70 ms — font-display: swaphttps://fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJXsCxGDNNQ9rJPfw.woff2wlppgwHKFkZgtmSR3NB0oRJ... https://fonts.gstatic.com/s/crimsontext/v19/wlppgwHKFkZgtmSR3NB0oRJXsCxGDNNQ9rJPfw.woff2 — 16.9 KiB — 31 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 — 12 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 — 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 — 8 ms — font-display: swaphttps://fonts.gstatic.com/s/crimsontext/v19/wlp2gwHKFkZgtmSR3NB0oRJfbwhTIfFd3A.woff2wlp2gwHKFkZgtmSR3NB0oRJ... https://fonts.gstatic.com/s/crimsontext/v19/wlp2gwHKFkZgtmSR3NB0oRJfbwhTIfFd3A.woff2 — 16.4 KiB — 10 ms — font-display: swap
fontello.woff2 woff2 swap
Size 7 KB
Load time 28 ms
Start 3.0 s
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 116 KB
Load time 70 ms
Start 3.0 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
wlppgwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 17 KB
Load time 31 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 12 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
wlprgwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 17 KB
Load time 34 ms
Start 3.1 s
Risk FOUT — text flashes from fallback to web font
wlppgwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 16 KB
Load time 8 ms
Start 3.2 s
Risk FOUT — text flashes from fallback to web font
wlp2gwHKFkZgtmSR3NB0oRJ... woff2 swap
Size 16 KB
Load time 10 ms
Start 3.2 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
Network Waterfall
154 requests over 4554ms
INFO
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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 1055ms · 50KB · €11/mo
www.ens.psl.eu
Other
Costly
Execution 423ms
Transfer 30 KB
Monthly Cost €5/mo
www.ens.psl.eu
Other
Costly
Execution 351ms
Transfer 21 KB
Monthly Cost €4/mo
Unattributable
Other
Costly
Execution 281ms
Transfer 0 KB
Monthly Cost €3/mo

These scripts may cost more than they're worth

  • www.ens.psl.eu adds 423ms and costs ~€5/month
  • www.ens.psl.eu adds 351ms and costs ~€4/month
  • Unattributable adds 281ms 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.

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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 423ms 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 351ms 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 281ms 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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