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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
2
PASS
9
INFO
2

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

64
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.

3.50 s

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

8.75 s

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

90 ms

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

0.001

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

5.70 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.

8.89 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
17
9 PASS 2 REVIEW 4 FIX
F
Page Weight Budget
Action
6.5 MB transferred, 69 requests
FIX
6.5 MB transferred, 69 requests
Critical::
Page weighs 7.7 MB (6.5 MB transferred)
Warning::
Images are 6.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.2 MB
Info::
69 HTTP requests
Info::
Estimated 1.4 g CO2 per page load
6.5 MB / 2.4 MB budget
6.5 MB transferred
69 requests
1.4 g CO2 per page load
Images 6.2 MiB 94%
JavaScript 211.8 KiB 3%
Fonts 78.7 KiB 1%
CSS 41.8 KiB 1%
HTML 38.8 KiB 1%
Other 1.5 KiB 0%
Other 221 B 0%
Other 0 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

D
Third-Party Impact
Action
95% third-party, 0 ms blocking
FIX
95% third-party, 0 ms blocking
Warning::
Third-party code accounts for 95% of page weight (6.2 MiB of 6.5 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
D
JS Execution Cost
Action
2600ms total JS execution
FIX
2600ms total JS execution
Warning::
Unattributable: 1008ms CPU time
Warning::
https://psl.eu/themes/custom/oooooo/assets/js/bund...: 608ms CPU time
Warning::
https://psl.eu/: 432ms CPU time
Info::
https://psl.eu/core/misc/drupal.init.js?v=10.5.6: 193ms CPU time
Info::
https://psl.eu/core/assets/vendor/jquery/jquery.mi...: 116ms CPU time
Info::
Third-party scripts: 1089ms (42% of total)

Main Thread Breakdown

Other 42% Script Evaluation 24% Style & Layout 19% Rendering 8% Parse HTML & CSS 4% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
Unattributable1008ms20ms0ms3rd
https://psl.eu/themes/custom/oooooo/assets/js/bundles/slider.bundle.js608ms264ms18ms1st
https://psl.eu/432ms14ms1ms1st
https://psl.eu/core/misc/drupal.init.js?v=10.5.6193ms109ms0ms1st
https://psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1116ms44ms11ms1st
https://psl.eu/themes/custom/oooooo/assets/js/oooooo.script.js?tdefyf107ms76ms20ms1st
https://matomo.psl.eu/js/container_hiK0OYeY.js81ms59ms21ms3rd
https://psl.eu/themes/custom/oooooo/assets/js/bundles/selectbox.bundle.js56ms33ms4ms1st
D
Page Weight Inventory
Action
69 resources · 6.5 MB · 24 KB savings available
FIX
69 resources · 6.5 MB · 24 KB savings available
Warning::
Page weight 5.5 MB over 1MB target
Got: 6.5 MB Expected: ≤ 1 MB
Warning::
28 third-party resources (95% of weight)
Info::
7 resources over 200KB
69 resources · 6.5 MiB · 28 third-party 5.5 MiB over 1MB target
Image 94% · 6.2 MiB
JavaScript 3% · 211.8 KiB
Font 1% · 78.7 KiB
CSS 1% · 41.8 KiB
Document 1% · 38.8 KiB
Other 0% · 221 B

~23.9 KiB of savings available

Remove unused JavaScript: 23.9 KiB
C
Image Optimization
Action
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://static.psl.eu/sites/default/files/2025-04/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.psl.eu/sites/default/files/2025-04/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://static.psl.eu/sites/default/files/2026-04/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://psl.eu/themes/custom/oooooo/assets/images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 6.2 MB
0 oversized -0 KB
25 legacy format
4 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

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
4 fonts (79 KB)
PASS
4 fonts (79 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

79 KB total

Render-blocking

0

of 4

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 8.0 s 9.0 s FCP 3.5 s LCP 8.8 shttps://psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-light.woff2cera_pro-light.woff2 https://psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-light.woff2 — 23.7 KiB — 216 ms — font-display: swaphttps://psl.eu/themes/custom/oooooo/assets/fonts/iconfont/iconfont.woff2iconfont.woff2 https://psl.eu/themes/custom/oooooo/assets/fonts/iconfont/iconfont.woff2 — 7.6 KiB — 190 ms — font-display: swaphttps://psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-bold.woff2cera_pro-bold.woff2 https://psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-bold.woff2 — 23.7 KiB — 285 ms — font-display: swaphttps://psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-medium.woff2cera_pro-medium.woff2 https://psl.eu/themes/custom/oooooo/assets/fonts/cera_pro/cera_pro-medium.woff2 — 23.7 KiB — 286 ms — font-display: swap
cera_pro-light.woff2 woff2 swap
Size 24 KB
Load time 216 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
iconfont.woff2 woff2 swap
Size 8 KB
Load time 190 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
cera_pro-bold.woff2 woff2 swap
Size 24 KB
Load time 285 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
cera_pro-medium.woff2 woff2 swap
Size 24 KB
Load time 286 ms
Start 1.5 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)
A+
JS Bundles
24 scripts, 24 KB unused
PASS
24 scripts, 24 KB unused
Warning::
https://psl.eu/themes/custom/oooooo/assets/js/bund...: 24 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 24 KB
24 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://psl.eu/themes/custom/oooooo/assets/js/bundles/slider.bundle.js41 KB24 KB (58%)✓1st
https://psl.eu/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.01 KB—✓1st
https://psl.eu/modules/custom/custom_front/assets/js/formation_paragraph.js?tdefyf1 KB—✓1st
https://psl.eu/core/assets/vendor/once/once.min.js?v=1.0.11 KB—✓1st
https://psl.eu/sites/default/files/languages/fr_G_wxD3PjXiNucpUiMwQwyUBxqj5E28REr_bJLELm-zA.js?tdefyf6 KB—✓1st
https://psl.eu/core/misc/drupal.js?v=10.5.66 KB—✗1st
https://psl.eu/core/misc/drupal.init.js?v=10.5.61 KB—✓1st
https://matomo.psl.eu/js/container_hiK0OYeY.js37 KB—✓3rd
https://psl.eu/core/misc/debounce.js?v=10.5.61 KB—✓1st
https://psl.eu/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?tdefyf1 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

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
A+
HTTP Caching
max-age=3600 (1 hour)
PASS
max-age=3600 (1 hour)
Info::
Cache-Control header is set
Got: max-age=3600, public
Info::
Effective TTL: 1 hour (max-age=3600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=3600, public

DirectiveValueMeaning
max-age3600Cache for 1 hour
public—Any cache may store this response
Effective TTL: 3600 seconds
Network Waterfall
69 requests over 4129ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.5 s LCP 8.8 shttps://psl.eu// https://psl.eu/ — 200 — 38.8 KiB — 348 ms — http/1.1https://psl.eu/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?tdefyf/sites/default/files/eu_cookie_comp... https://psl.eu/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?tdefyf — 200 — 594 B — 98 ms — http/1.1https://psl.eu/themes/custom/oooooo/assets/css/loader.style.css/themes/custom/oooooo/assets/css/lo... https://psl.eu/themes/custom/oooooo/assets/css/loader.style.css — 200 — 335 B — 246 ms — http/1.1https://psl.eu/core/misc/components/progress.module.css?tdefyf/core/misc/components/progress.modu... https://psl.eu/core/misc/components/progress.module.css?tdefyf — 200 — 741 B — 247 ms — http/1.1https://psl.eu/core/misc/components/ajax-progress.module.css?tdefyf/core/misc/components/ajax-progress... https://psl.eu/core/misc/components/ajax-progress.module.css?tdefyf — 200 — 869 B — 248 ms — http/1.1https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css — 200 — 10.9 KiB — 22 ms — h3https://psl.eu/modules/contrib/eu_cookie_compliance/css/eu_cookie_compliance.css?tdefyf/modules/contrib/eu_cookie_complian... https://psl.eu/modules/contrib/eu_cookie_compliance/css/eu_cookie_compliance.css?tdefyf — 200 — 1.7 KiB — 249 ms — http/1.1https://psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tdefyf/modules/contrib/paragraphs/css/par... https://psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tdefyf — 200 — 394 B — 310 ms — http/1.1https://psl.eu/modules/contrib/social_media_links/css/social_media_links.theme.css?tdefyf/modules/contrib/social_media_links... https://psl.eu/modules/contrib/social_media_links/css/social_media_links.theme.css?tdefyf — 200 — 619 B — 342 ms — http/1.1https://psl.eu/themes/custom/oooooo/components/01-quarks/swiper/swiper.css?tdefyf/themes/custom/oooooo/components/01... https://psl.eu/themes/custom/oooooo/components/01-quarks/swiper/swiper.css?tdefyf — 200 — 3.2 KiB — 489 ms — http/1.1https://psl.eu/core/modules/system/css/components/hidden.module.css?tdefyf/core/modules/system/css/components... https://psl.eu/core/modules/system/css/components/hidden.module.css?tdefyf — 200 — 1.0 KiB — 492 ms — http/1.1https://psl.eu/themes/custom/oooooo/assets/css/oooooo.style.css?tdefyf/themes/custom/oooooo/assets/css/oo... https://psl.eu/themes/custom/oooooo/assets/css/oooooo.style.css?tdefyf — 200 — 20.1 KiB — 574 ms — http/1.1https://psl.eu/themes/custom/oooooo/assets/css/oooooo.extra.css?tdefyf/themes/custom/oooooo/assets/css/oo... https://psl.eu/themes/custom/oooooo/assets/css/oooooo.extra.css?tdefyf — 200 — 775 B — 494 ms — http/1.1https://psl.eu/core/misc/drupalSettingsLoader.js?v=10.5.6/core/misc/drupalSettingsLoader.js?... https://psl.eu/core/misc/drupalSettingsLoader.js?v=10.5.6 — 200 — 787 B — 551 ms — http/1.1https://static.psl.eu/sites/default/files/2025-04/establishments.svgstatic.psl.eu/sites/default/files/2... https://static.psl.eu/sites/default/files/2025-04/establishments.svg — 200 — 336.0 KiB — 554 ms — http/1.1https://psl.eu/themes/custom/oooooo/assets/images/logo.svg/themes/custom/oooooo/assets/images... https://psl.eu/themes/custom/oooooo/assets/images/logo.svg — 200 — 9.6 KiB — 247 ms — http/1.1https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swapfonts.googleapis.com/css2?family=Po... https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400;1,500;1,600;1,700&display=swap — 200 — 1.2 KiB — 45 ms — h2https://psl.eu/themes/custom/oooooo/assets/images/hp_formation.svg/themes/custom/oooooo/assets/images... https://psl.eu/themes/custom/oooooo/assets/images/hp_formation.svg — 200 — 3.2 KiB — 245 ms — http/1.1https://static.psl.eu/sites/default/files/2025-04/students.svgstatic.psl.eu/sites/default/files/2... https://static.psl.eu/sites/default/files/2025-04/students.svg — 200 — 13.5 KiB — 299 ms — http/1.1https://static.psl.eu/sites/default/files/2025-04/laboratories.svgstatic.psl.eu/sites/default/files/2... https://static.psl.eu/sites/default/files/2025-04/laboratories.svg — 200 — 11.7 KiB — 234 ms — http/1.1https://psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1/core/assets/vendor/jquery/jquery.m... https://psl.eu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 — 200 — 30.0 KiB — 336 ms — http/1.1https://psl.eu/core/assets/vendor/once/once.min.js?v=1.0.1/core/assets/vendor/once/once.min.j... https://psl.eu/core/assets/vendor/once/once.min.js?v=1.0.1 — 200 — 1.1 KiB — 249 ms — http/1.1https://psl.eu/sites/default/files/languages/fr_G_wxD3PjXiNucpUiMwQwyUBxqj5E28REr_bJLELm-zA.js?tdefyf/sites/default/files/languages/fr_G... https://psl.eu/sites/default/files/languages/fr_G_wxD3PjXiNucpUiMwQwyUBxqj5E28REr_bJLELm-zA.js?tdefyf — 200 — 5.6 KiB — 254 ms — http/1.1https://psl.eu/core/misc/drupal.js?v=10.5.6/core/misc/drupal.js?v=10.5.6 https://psl.eu/core/misc/drupal.js?v=10.5.6 — 200 — 6.5 KiB — 254 ms — http/1.1https://psl.eu/core/misc/drupal.init.js?v=10.5.6/core/misc/drupal.init.js?v=10.5.6 https://psl.eu/core/misc/drupal.init.js?v=10.5.6 — 200 — 891 B — 253 ms — http/1.1https://matomo.psl.eu/js/container_hiK0OYeY.jsmatomo.psl.eu/js/container_hiK0OYeY... https://matomo.psl.eu/js/container_hiK0OYeY.js — 200 — 37.2 KiB — 420 ms — http/1.1https://static.psl.eu/sites/default/files/2025-04/students_0.svgstatic.psl.eu/sites/default/files/2... https://static.psl.eu/sites/default/files/2025-04/students_0.svg — 200 — 13.5 KiB — 300 ms — http/1.1https://psl.eu/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0/core/assets/vendor/tabbable/index.... https://psl.eu/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0 — 200 — 2.8 KiB — 249 ms — http/1.1https://static.psl.eu/sites/default/files/2025-04/logo-footer.svgstatic.psl.eu/sites/default/files/2... https://static.psl.eu/sites/default/files/2025-04/logo-footer.svg — 200 — 5.5 KiB — 228 ms — http/1.1https://static.psl.eu/sites/default/files/2025-04/logotype-blanc.svgstatic.psl.eu/sites/default/files/2... https://static.psl.eu/sites/default/files/2025-04/logotype-blanc.svg — 200 — 20.1 KiB — 298 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 3.5 s LCP 8.8 shttps://psl.eu// https://psl.eu/ — 200 — 38.8 KiB — 348 ms — http/1.1https://psl.eu/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?tdefyf/sites/default/files/eu_cookie_comp... https://psl.eu/sites/default/files/eu_cookie_compliance/eu_cookie_compliance.script.js?tdefyf — 200 — 594 B — 98 ms — http/1.1https://psl.eu/themes/custom/oooooo/assets/css/loader.style.css/themes/custom/oooooo/assets/css/lo... https://psl.eu/themes/custom/oooooo/assets/css/loader.style.css — 200 — 335 B — 246 ms — http/1.1https://psl.eu/core/misc/components/progress.module.css?tdefyf/core/misc/components/progress.modu... https://psl.eu/core/misc/components/progress.module.css?tdefyf — 200 — 741 B — 247 ms — http/1.1https://psl.eu/core/misc/components/ajax-progress.module.css?tdefyf/core/misc/components/ajax-progress... https://psl.eu/core/misc/components/ajax-progress.module.css?tdefyf — 200 — 869 B — 248 ms — http/1.1https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css — 200 — 10.9 KiB — 22 ms — h3https://psl.eu/modules/contrib/eu_cookie_compliance/css/eu_cookie_compliance.css?tdefyf/modules/contrib/eu_cookie_complian... https://psl.eu/modules/contrib/eu_cookie_compliance/css/eu_cookie_compliance.css?tdefyf — 200 — 1.7 KiB — 249 ms — http/1.1https://psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tdefyf/modules/contrib/paragraphs/css/par... https://psl.eu/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tdefyf — 200 — 394 B — 310 ms — http/1.1https://psl.eu/modules/contrib/social_media_links/css/social_media_links.theme.css?tdefyf/modules/contrib/social_media_links... https://psl.eu/modules/contrib/social_media_links/css/social_media_links.theme.css?tdefyf — 200 — 619 B — 342 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
42% of JavaScript execution is third-party
First-party Third-party 1089ms · 37KB · €12/mo
Unattributable
Other
Costly
Execution 1008ms
Transfer 0 KB
Monthly Cost €11/mo
Matomo
Analytics
Optional
Execution 81ms
Transfer 37 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1008ms and costs ~€11/month

42% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 1008ms 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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