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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
49
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

11.83 s

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

16.14 s

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

282 ms

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

0.060

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

11.83 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.

16.14 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
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 50 requests
FIX
3.1 MB transferred, 50 requests
Warning::
Page weighs 3.5 MB (3.1 MB transferred)
Warning::
JavaScript is 1.7 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.7 MB
Info::
CSS is 373 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 373 KB
Info::
Fonts are 205 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 205 KB
Info::
50 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
50 requests
0.65 g CO2 per page load
JavaScript 1.7 MiB 53%
Images 869.8 KiB 27%
CSS 372.6 KiB 12%
Fonts 205.3 KiB 6%
Other 18.1 KiB 1%
HTML 14.3 KiB 0%
Other 11.7 KiB 0%
Other 5.6 KiB 0%
Other 1.8 KiB 0%
Other 370 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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

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

F
JS Bundles
Action
15 scripts, 1.1 MB unused
FIX
15 scripts, 1.1 MB unused
Warning::
https://hal.science/assets/build/main.2146cdd3.js: 870 KB unused (75%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://hal.science/static/js/tarteaucitron/tartea...: 178 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://hal.science/static/js/tarteaucitron/tartea...: unminified — 68 KB could be saved
Warning::
https://hal.science/static/js/tarteaucitron/tartea...: 55 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://hal.science/static/js/tarteaucitron/tartea...: unminified — 45 KB could be saved
Warning::
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7...: 32 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 1.1 MB
1136 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://hal.science/assets/build/main.2146cdd3.js1156 KB870 KB (75%)✓1st
https://hal.science/static/js/tarteaucitron/tarteaucitron.services.js244 KB178 KB (73%)✗1st
https://hal.science/static/js/tarteaucitron/tarteaucitron.js122 KB55 KB (45%)✗1st
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js?V=2.7.559 KB32 KB (55%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js17 KB—✓3rd
https://hal.science/assets/build/runtime.79766688.js2 KB—✓1st
https://hal.science/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=devel6 KB—✓1st
https://hal.science/assets/js/select2totree.js5 KB—✓1st
https://hal.science/assets/js/translations.php?lang=en26 KB—✓1st
https://hal.science/static/js/tarteaucitron4hal/tarteaucitron.servicesHAL.js2 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

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

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

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

F
Page Weight Inventory
Action
50 resources · 3.1 MB · 1.1 MB savings available
FIX
50 resources · 3.1 MB · 1.1 MB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~1.1 MB of savings available
Info::
10 third-party resources (5% of weight)
Info::
4 resources over 200KB
50 resources · 3.1 MiB · 10 third-party 2.1 MiB over 1MB target
JavaScript 53% · 1.7 MiB
Image 28% · 887.2 KiB
CSS 12% · 372.6 KiB
Font 6% · 205.3 KiB
Document 1% · 28.5 KiB
Other 0% · 6.0 KiB

~1.1 MiB of savings available

Remove unused JavaScript: 1.1 MiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-store
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-store

DirectiveValueMeaning
no-store—Never cache this response
C
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://hal.science/assets/img/CoreTrustSeal.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hal.science/public/mesr.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hal.science/public/cnrs.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hal.science/public/inria.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hal.science/public/inrae.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 870 KB
0 oversized -0 KB
10 legacy format
5 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

C
JS Execution Cost
Action
1476ms total JS execution
REVIEW
1476ms total JS execution
Warning::
https://hal.science/: 560ms CPU time
Warning::
https://hal.science/assets/build/main.2146cdd3.js: 417ms CPU time
Warning::
Unattributable: 314ms CPU time
Info::
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7...: 134ms CPU time
Info::
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7...: 51ms CPU time
Info::
Third-party scripts: 499ms (34% of total)

Main Thread Breakdown

Script Evaluation 33% Other 31% Style & Layout 17% Script Parsing & Compilation 12% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://hal.science/560ms6ms3ms1st
https://hal.science/assets/build/main.2146cdd3.js417ms287ms111ms1st
Unattributable314ms23ms0ms3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js?V=2.7.5134ms103ms24ms3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js?config=TeX-AMS-MML_HTMLorMML51ms25ms24ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
5% third-party, 0 ms blocking
PASS
5% third-party, 0 ms blocking
Info::
Third-party code accounts for 5% of page weight (164.8 KiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
95%
First-party Third-party
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 (205 KB)
PASS
4 fonts (205 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

205 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 11.8 s LCP 16.1 shttps://hal.science/.within.website/x/xess/static/podkova.woff2podkova.woff2 https://hal.science/.within.website/x/xess/static/podkova.woff2 — 59.3 KiB — 46 ms — font-display: swaphttps://hal.science/.within.website/x/xess/static/geist.woff2geist.woff2 https://hal.science/.within.website/x/xess/static/geist.woff2 — 62.8 KiB — 45 ms — font-display: swaphttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — 35.0 KiB — 36 ms — font-display: swaphttps://hal.science/assets/fonts/icomoon.ttf?p6x699icomoon.ttf https://hal.science/assets/fonts/icomoon.ttf?p6x699 — 48.1 KiB — 29 ms — font-display: swap
podkova.woff2 woff2 swap
Size 59 KB
Load time 46 ms
Start 154 ms
Risk FOUT — text flashes from fallback to web font
geist.woff2 woff2 swap
Size 63 KB
Load time 45 ms
Start 155 ms
Risk FOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 36 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 48 KB
Load time 29 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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 ~14 KB and ~28 ms

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
50 requests over 1673ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 11.8 s LCP 16.1 shttps://hal.science// https://hal.science/ — 200 — 5.8 KiB — 80 ms — h2https://hal.science/.within.website/x/xess/xess.css?cachebuster=devel/.within.website/x/xess/xess.css?ca... https://hal.science/.within.website/x/xess/xess.css?cachebuster=devel — 200 — 2.7 KiB — 48 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=devel — 200 — 28.4 KiB — 69 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=devel — 200 — 30.0 KiB — 67 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=devel — 200 — 5.8 KiB — 45 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/locales/en.json/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/locales/en.json — 200 — 5.6 KiB — 25 ms — h2https://hal.science/.within.website/x/xess/static/podkova.woff2/.within.website/x/xess/static/podk... https://hal.science/.within.website/x/xess/static/podkova.woff2 — 200 — 59.3 KiB — 46 ms — h2https://hal.science/.within.website/x/xess/static/geist.woff2/.within.website/x/xess/static/geis... https://hal.science/.within.website/x/xess/static/geist.woff2 — 200 — 62.8 KiB — 45 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=devel — 200 — 104 B — 43 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/js/worker/sha256-webcrypto.mjs?cacheBuster=devel — 200 — 104 B — 64 ms — h2https://hal.science/favicon.ico/favicon.ico https://hal.science/favicon.ico — 200 — 15.0 KiB — 30 ms — h2https://hal.science/.within.website/x/cmd/anubis/api/pass-challenge?id=019db285-934f-7e4c-993a-f1b4e82bfc33&response=00008f8fd268d03d73ddf4902f7cc6f9a0536a6bb92e4536f8e41c3fa0763e4a&nonce=87541&redir=https%3A%2F%2Fhal.science%2F&elapsedTime=648/.within.website/x/cmd/anubis/api/p... https://hal.science/.within.website/x/cmd/anubis/api/pass-challenge?id=019db285-934f-7e4c-993a-f1b4e82bfc33&response=00008f8fd268d03d73ddf4902f7cc6f9a0536a6bb92e4536f8e41c3fa0763e4a&nonce=87541&redir=https%3A%2F%2Fhal.science%2F&elapsedTime=648 — 302 — 684 B — 27 ms — h2https://hal.science// https://hal.science/ — 200 — 8.5 KiB — 183 ms — h2https://hal.science/assets/build/main.7422c588.css/assets/build/main.7422c588.css https://hal.science/assets/build/main.7422c588.css — 200 — 332.4 KiB — 111 ms — h2https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.csscdnjs.cloudflare.com/ajax/libs/sele... https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css — 200 — 1.9 KiB — 91 ms — h2https://hal.science/assets/css/select2totree.css/assets/css/select2totree.css https://hal.science/assets/css/select2totree.css — 200 — 3.5 KiB — 57 ms — h2https://hal.science/public/style.ng.css?1759935239/public/style.ng.css?1759935239 https://hal.science/public/style.ng.css?1759935239 — 200 — 317 B — 35 ms — h2https://hal.science/assets/js/translations.php?lang=en/assets/js/translations.php?lang=en https://hal.science/assets/js/translations.php?lang=en — 200 — 26.4 KiB — 107 ms — h2https://hal.science/assets/build/runtime.79766688.js/assets/build/runtime.79766688.js https://hal.science/assets/build/runtime.79766688.js — 200 — 1.6 KiB — 60 ms — h2https://hal.science/assets/build/main.2146cdd3.js/assets/build/main.2146cdd3.js https://hal.science/assets/build/main.2146cdd3.js — 200 — 1.1 MiB — 145 ms — h2https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.jscdnjs.cloudflare.com/ajax/libs/sele... https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js — 200 — 16.7 KiB — 90 ms — h2https://hal.science/assets/js/select2totree.js/assets/js/select2totree.js https://hal.science/assets/js/select2totree.js — 200 — 5.2 KiB — 103 ms — h2https://hal.science/static/js/tarteaucitron/tarteaucitron.js/static/js/tarteaucitron/tarteaucit... https://hal.science/static/js/tarteaucitron/tarteaucitron.js — 200 — 122.3 KiB — 98 ms — h2https://hal.science/static/js/tarteaucitron4hal/tarteaucitron.servicesHAL.js/static/js/tarteaucitron4hal/tartea... https://hal.science/static/js/tarteaucitron4hal/tarteaucitron.servicesHAL.js — 200 — 2.0 KiB — 101 ms — h2https://hal.science/assets/img/hal-logo-header.png/assets/img/hal-logo-header.png https://hal.science/assets/img/hal-logo-header.png — 200 — 90.0 KiB — 101 ms — h2https://hal.science/assets/img/hal-logo-text.png/assets/img/hal-logo-text.png https://hal.science/assets/img/hal-logo-text.png — 200 — 6.4 KiB — 57 ms — h2https://hal.science/assets/img/hal_25_en.png/assets/img/hal_25_en.png https://hal.science/assets/img/hal_25_en.png — 200 — 50.0 KiB — 75 ms — h2https://hal.science/img/loading.gif/img/loading.gif https://hal.science/img/loading.gif — 200 — 1.9 KiB — 43 ms — h2https://fonts.googleapis.com/css2?family=Noto+Sans:wght@400;700&display=swapfonts.googleapis.com/css2?family=No... https://fonts.googleapis.com/css2?family=Noto+Sans:wght@400;700&display=swap — 200 — 1.2 KiB — 96 ms — h2https://hal.science/public/mesr.svg/public/mesr.svg https://hal.science/public/mesr.svg — 200 — 20.2 KiB — 29 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s FCP 11.8 s LCP 16.1 shttps://hal.science// https://hal.science/ — 200 — 5.8 KiB — 80 ms — h2https://hal.science/.within.website/x/xess/xess.css?cachebuster=devel/.within.website/x/xess/xess.css?ca... https://hal.science/.within.website/x/xess/xess.css?cachebuster=devel — 200 — 2.7 KiB — 48 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/img/pensive.webp?cacheBuster=devel — 200 — 28.4 KiB — 69 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=devel/.within.website/x/cmd/anubis/stati... https://hal.science/.within.website/x/cmd/anubis/static/img/happy.webp?cacheBuster=devel — 200 — 30.0 KiB — 67 ms — h2https://hal.science/.within.website/x/cmd/anubis/static/js/main.mjs?cacheBuster=devel/.within.website/x/cmd/anubis/stati... 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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
34% of JavaScript execution is third-party
First-party Third-party 499ms · 76KB · €5/mo
Unattributable
Other
Costly
Execution 314ms
Transfer 0 KB
Monthly Cost €3/mo
cdnjs
CDN
Optional
Execution 134ms
Transfer 59 KB
Unused 55%
Monthly Cost €1/mo
cdnjs
CDN
Optional
Execution 51ms
Transfer 17 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 314ms and costs ~€3/month

Unattributable takes 314ms 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

55% of cdnjs'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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