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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
4
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
70
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.

2.32 s

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

3.06 s

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

44 ms

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

0.015

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

2.32 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.

3.06 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
15
7 PASS 2 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 372.9 KiB 12%
Fonts 205.3 KiB 6%
Other 18.1 KiB 1%
HTML 14.3 KiB 0%
Other 11.6 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...: 33 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 KB33 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% · 372.9 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/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/inrae.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://hal.science/assets/img/hal_25_en.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/assets/img/CoreTrustSeal.png 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
6 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

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 (165.5 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+
JS Execution Cost
433ms total JS execution
PASS
433ms total JS execution
Info::
https://hal.science/: 197ms CPU time
Info::
https://hal.science/assets/build/main.2146cdd3.js: 119ms CPU time
Info::
Unattributable: 116ms CPU time
Info::
Third-party scripts: 116ms (27% of total)

Main Thread Breakdown

Other 34% Script Evaluation 28% Style & Layout 18% Script Parsing & Compilation 10% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://hal.science/197ms1ms1ms1st
https://hal.science/assets/build/main.2146cdd3.js119ms81ms33ms1st
Unattributable116ms6ms0ms3rd
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 1.0 s 2.0 s 3.0 s FCP 2.3 s LCP 3.1 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 — 46 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 — 35 ms — font-display: swaphttps://hal.science/assets/fonts/icomoon.ttf?p6x699icomoon.ttf https://hal.science/assets/fonts/icomoon.ttf?p6x699 — 48.1 KiB — 31 ms — font-display: swap
podkova.woff2 woff2 swap
Size 59 KB
Load time 46 ms
Start 161 ms
Risk FOUT — text flashes from fallback to web font
geist.woff2 woff2 swap
Size 63 KB
Load time 46 ms
Start 162 ms
Risk FOUT — text flashes from fallback to web font
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 35 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
icomoon.ttf ttf swap
Size 48 KB
Load time 31 ms
Start 1.6 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
Network Waterfall
50 requests over 1815ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.3 s LCP 3.1 shttps://hal.science// https://hal.science/ — 200 — 5.8 KiB — 83 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 — 52 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 — 48 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 — 50 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 — 46 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 — 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 — 37 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 — 58 ms — h2https://hal.science/favicon.ico/favicon.ico https://hal.science/favicon.ico — 200 — 15.0 KiB — 31 ms — h2https://hal.science/.within.website/x/cmd/anubis/api/pass-challenge?id=019db285-df49-70de-b2ad-457eb215e22e&response=00008cacb387e027c0992ad673c3bbdcb8ec3d30895887e1f3a984ad823a4e6f&nonce=92039&redir=https%3A%2F%2Fhal.science%2F&elapsedTime=735/.within.website/x/cmd/anubis/api/p... https://hal.science/.within.website/x/cmd/anubis/api/pass-challenge?id=019db285-df49-70de-b2ad-457eb215e22e&response=00008cacb387e027c0992ad673c3bbdcb8ec3d30895887e1f3a984ad823a4e6f&nonce=92039&redir=https%3A%2F%2Fhal.science%2F&elapsedTime=735 — 302 — 684 B — 26 ms — h2https://hal.science// https://hal.science/ — 200 — 8.5 KiB — 168 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 — 150 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 — 2.2 KiB — 48 ms — h3https://hal.science/assets/css/select2totree.css/assets/css/select2totree.css https://hal.science/assets/css/select2totree.css — 200 — 3.5 KiB — 33 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 — 34 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 — 120 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 — 78 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 — 166 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 — 63 ms — h3https://hal.science/assets/js/select2totree.js/assets/js/select2totree.js https://hal.science/assets/js/select2totree.js — 200 — 5.2 KiB — 78 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 — 141 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 — 52 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 — 137 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 — 52 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 — 79 ms — h2https://hal.science/img/loading.gif/img/loading.gif https://hal.science/img/loading.gif — 200 — 1.9 KiB — 29 ms — h2https://hal.science/public/mesr.svg/public/mesr.svg https://hal.science/public/mesr.svg — 200 — 20.2 KiB — 31 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 — 97 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 2.3 s LCP 3.1 shttps://hal.science// https://hal.science/ — 200 — 5.8 KiB — 83 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 — 52 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 — 48 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 — 50 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 — 46 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 — 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 — 37 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
27% of JavaScript execution is third-party
First-party Third-party 116ms · 0KB · €1/mo
Unattributable
Other
Optional
Execution 116ms
Transfer 0 KB
Monthly Cost €1/mo

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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