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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
88
GRADE
B
FIX
0
REVIEW
4
PASS
9
INFO
2

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

Mobile Desktop
85
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
73
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.

1.61 s

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

1.84 s

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

31 ms

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

0.006

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

1.61 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.

1.84 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
9 PASS 4 REVIEW
C
Page Weight Budget
Action
1.6 MB transferred, 75 requests
REVIEW
1.6 MB transferred, 75 requests
Info::
Page weighs 3.0 MB (1.6 MB transferred)
Warning::
JavaScript is 590 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 590 KB
Info::
Fonts are 268 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 268 KB
Info::
75 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
75 requests
0.33 g CO2 per page load
Images 658.6 KiB 41%
JavaScript 589.8 KiB 36%
Fonts 268.4 KiB 17%
CSS 91.2 KiB 6%
HTML 8.3 KiB 1%
Other 6.6 KiB 0%
Other 647 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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

C
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
https://scikit-learn.org/stable/_images/sphx_glr_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/nvidia-sma... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/czi-small.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/wellcome-t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/scikit-lea... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_images/sphx_glr_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_images/inria.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/probabl.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/chanel-sma... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_images/sphx_glr_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_images/sphx_glr_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_images/sphx_glr_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/bnp-pariba... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/microsoft-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/quansight-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_images/sphx_glr_p... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://scikit-learn.org/stable/_static/inria-smal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
22 images 659 KB
0 oversized -0 KB
22 legacy format
17 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

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
Page Weight Inventory
Action
75 resources · 1.6 MB · 0 KB savings available
REVIEW
75 resources · 1.6 MB · 0 KB savings available
Warning::
Page weight 599 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
5 third-party resources (0% of weight)
Info::
1 resources over 200KB
75 resources · 1.6 MiB · 5 third-party 599.4 KiB over 1MB target
Image 41% · 659.4 KiB
JavaScript 36% · 589.8 KiB
Font 17% · 268.4 KiB
CSS 6% · 91.2 KiB
Document 1% · 14.1 KiB
Other 0% · 647 B
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
0% third-party, 0 ms blocking
PASS
0% third-party, 0 ms blocking
Info::
Third-party code accounts for 0% of page weight (2.7 KiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
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
368ms total JS execution
PASS
368ms total JS execution
Info::
https://scikit-learn.org/stable/_static/scripts/fo...: 134ms CPU time
Info::
https://scikit-learn.org/stable/: 126ms CPU time
Info::
Unattributable: 108ms CPU time
Info::
Third-party scripts: 108ms (29% of total)

Main Thread Breakdown

Other 40% Style & Layout 21% Script Evaluation 16% Script Parsing & Compilation 14% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://scikit-learn.org/stable/_static/scripts/fontawesome.js?digest=8878045cc6db502f8baf134ms41ms51ms1st
https://scikit-learn.org/stable/126ms3ms0ms1st
Unattributable108ms2ms0ms3rd
A+
Font Loading
2 fonts (268 KB)
PASS
2 fonts (268 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

268 KB total

Render-blocking

0

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s FCP 1.6 s LCP 1.8 shttps://scikit-learn.org/stable/_static/vendor/fontawesome/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://scikit-learn.org/stable/_static/vendor/fontawesome/webfonts/fa-solid-900.woff2 — 153.0 KiB — 19 ms — font-display: swaphttps://scikit-learn.org/stable/_static/vendor/fontawesome/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://scikit-learn.org/stable/_static/vendor/fontawesome/webfonts/fa-brands-400.woff2 — 115.3 KiB — 18 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 153 KB
Load time 19 ms
Start 428 ms
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
fa-brands-400.woff2 woff2 swap
Size 115 KB
Load time 18 ms
Start 430 ms
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
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 ~134 KB and ~268 ms

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

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://scikit-learn.org/_static/jquery.js0 KB—✓1st
https://scikit-learn.org/_static/underscore.js0 KB—✓1st
https://scikit-learn.org/_static/doctools.js0 KB—✓1st
https://scikit-learn.org/_static/js/copybutton.js0 KB—✓1st
https://scikit-learn.org/_static/js/bootstrap.min.js0 KB—✓1st
https://scikit-learn.org/stable/_static/scripts/fontawesome.js?digest=8878045cc6db502f8baf541 KB—✓1st
https://scikit-learn.org/stable/_static/scripts/bootstrap.js?digest=8878045cc6db502f8baf24 KB—✓1st
https://scikit-learn.org/stable/_static/scripts/pydata-sphinx-theme.js?digest=8878045cc6db502f8baf4 KB—✓1st
https://scikit-learn.org/stable/_static/documentation_options.js?v=b51e69720 KB—✓1st
https://scikit-learn.org/stable/_static/doctools.js?v=9bcbadda2 KB—✓1st
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+
HTTP Caching
max-age=600 (10 minutes)
PASS
max-age=600 (10 minutes)
Info::
Cache-Control header is set
Got: max-age=600
Info::
Effective TTL: 10 minutes (max-age=600)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=600

DirectiveValueMeaning
max-age600Cache for 10 minutes
Effective TTL: 600 seconds
Network Waterfall
75 requests over 760ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.6 s LCP 1.8 shttps://scikit-learn.org// https://scikit-learn.org/ — 200 — 1.2 KiB — 17 ms — h2https://scikit-learn.org/_static/css/bootstrap.min.css/_static/css/bootstrap.min.css https://scikit-learn.org/_static/css/bootstrap.min.css — 404 — 133 B — 12 ms — h2https://scikit-learn.org/_static/css/bootstrap-responsive.css/_static/css/bootstrap-responsive.c... https://scikit-learn.org/_static/css/bootstrap-responsive.css — 404 — 230 B — 11 ms — h2https://scikit-learn.org/_static/nature.css/_static/nature.css https://scikit-learn.org/_static/nature.css — 404 — 214 B — 20 ms — h2https://scikit-learn.org/_static/pygments.css/_static/pygments.css https://scikit-learn.org/_static/pygments.css — 404 — 117 B — 26 ms — h2https://scikit-learn.org/_static/gallery.css/_static/gallery.css https://scikit-learn.org/_static/gallery.css — 404 — 118 B — 12 ms — h2https://scikit-learn.org/_static/jquery.js/_static/jquery.js https://scikit-learn.org/_static/jquery.js — 404 — 147 B — 16 ms — h2https://scikit-learn.org/_static/underscore.js/_static/underscore.js https://scikit-learn.org/_static/underscore.js — 404 — 175 B — 17 ms — h2https://scikit-learn.org/_static/doctools.js/_static/doctools.js https://scikit-learn.org/_static/doctools.js — 404 — 162 B — 28 ms — h2https://scikit-learn.org/_static/js/copybutton.js/_static/js/copybutton.js https://scikit-learn.org/_static/js/copybutton.js — 404 — 132 B — 23 ms — h2https://scikit-learn.org/_static/js/bootstrap.min.js/_static/js/bootstrap.min.js https://scikit-learn.org/_static/js/bootstrap.min.js — 404 — 173 B — 19 ms — h2http://scikit-learn.github.io/stablescikit-learn.github.io/stable http://scikit-learn.github.io/stable — 307 — 0 B — 11 ms — http/1.1https://scikit-learn.org/_static/favicon.ico/_static/favicon.ico https://scikit-learn.org/_static/favicon.ico — 404 — 5.3 KiB — 7 ms — h2https://scikit-learn.github.io/stablescikit-learn.github.io/stable https://scikit-learn.github.io/stable — 301 — 286 B — 16 ms — h2http://scikit-learn.org/stable/stable http://scikit-learn.org/stable — 307 — 0 B — 2 ms — http/1.1https://scikit-learn.org/stable/stable https://scikit-learn.org/stable — 301 — 245 B — 7 ms — h2https://scikit-learn.org/stable//stable/ https://scikit-learn.org/stable/ — 200 — 7.1 KiB — 7 ms — h2https://scikit-learn.org/stable/_static/styles/theme.css?digest=8878045cc6db502f8baf/stable/_static/styles/theme.css?di... https://scikit-learn.org/stable/_static/styles/theme.css?digest=8878045cc6db502f8baf — 200 — 332 B — 44 ms — h2https://scikit-learn.org/stable/_static/styles/pydata-sphinx-theme.css?digest=8878045cc6db502f8baf/stable/_static/styles/pydata-sphin... https://scikit-learn.org/stable/_static/styles/pydata-sphinx-theme.css?digest=8878045cc6db502f8baf — 200 — 65.1 KiB — 76 ms — h2https://scikit-learn.org/stable/_static/pygments.css?v=8f2a1f02/stable/_static/pygments.css?v=8f2a... https://scikit-learn.org/stable/_static/pygments.css?v=8f2a1f02 — 200 — 2.0 KiB — 46 ms — h2https://scikit-learn.org/stable/_static/copybutton.css?v=76b2166b/stable/_static/copybutton.css?v=76... https://scikit-learn.org/stable/_static/copybutton.css?v=76b2166b — 200 — 987 B — 46 ms — h2https://scikit-learn.org/stable/_static/plot_directive.css/stable/_static/plot_directive.css https://scikit-learn.org/stable/_static/plot_directive.css — 200 — 465 B — 46 ms — h2https://fonts.googleapis.com/css?family=Viburfonts.googleapis.com/css?family=Vib... https://fonts.googleapis.com/css?family=Vibur — 200 — 747 B — 98 ms — h2https://scikit-learn.org/stable/_static/jupyterlite_sphinx.css?v=8ee2c72c/stable/_static/jupyterlite_sphinx.... https://scikit-learn.org/stable/_static/jupyterlite_sphinx.css?v=8ee2c72c — 200 — 815 B — 46 ms — h2https://scikit-learn.org/stable/_static/sg_gallery.css?v=d2d258e8/stable/_static/sg_gallery.css?v=d2... https://scikit-learn.org/stable/_static/sg_gallery.css?v=d2d258e8 — 200 — 2.9 KiB — 46 ms — h2https://scikit-learn.org/stable/_static/sg_gallery-binder.css?v=f4aeca0c/stable/_static/sg_gallery-binder.c... https://scikit-learn.org/stable/_static/sg_gallery-binder.css?v=f4aeca0c — 200 — 408 B — 27 ms — h2https://scikit-learn.org/stable/_static/sg_gallery-dataframe.css?v=2082cf3c/stable/_static/sg_gallery-datafram... https://scikit-learn.org/stable/_static/sg_gallery-dataframe.css?v=2082cf3c — 200 — 748 B — 44 ms — h2https://scikit-learn.org/stable/_static/sg_gallery-rendered-html.css?v=1277b6f3/stable/_static/sg_gallery-rendered... https://scikit-learn.org/stable/_static/sg_gallery-rendered-html.css?v=1277b6f3 — 200 — 1.2 KiB — 18 ms — h2https://scikit-learn.org/stable/_static/sphinx-design.min.css?v=95c83b7e/stable/_static/sphinx-design.min.c... https://scikit-learn.org/stable/_static/sphinx-design.min.css?v=95c83b7e — 200 — 7.2 KiB — 44 ms — h2https://scikit-learn.org/stable/_static/styles/index.css?v=e49e61c4/stable/_static/styles/index.css?v=... https://scikit-learn.org/stable/_static/styles/index.css?v=e49e61c4 — 200 — 1.3 KiB — 44 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 1.6 s LCP 1.8 shttps://scikit-learn.org// https://scikit-learn.org/ — 200 — 1.2 KiB — 17 ms — h2https://scikit-learn.org/_static/css/bootstrap.min.css/_static/css/bootstrap.min.css https://scikit-learn.org/_static/css/bootstrap.min.css — 404 — 133 B — 12 ms — h2https://scikit-learn.org/_static/css/bootstrap-responsive.css/_static/css/bootstrap-responsive.c... https://scikit-learn.org/_static/css/bootstrap-responsive.css — 404 — 230 B — 11 ms — h2https://scikit-learn.org/_static/nature.css/_static/nature.css https://scikit-learn.org/_static/nature.css — 404 — 214 B — 20 ms — h2https://scikit-learn.org/_static/pygments.css/_static/pygments.css https://scikit-learn.org/_static/pygments.css — 404 — 117 B — 26 ms — h2https://scikit-learn.org/_static/gallery.css/_static/gallery.css https://scikit-learn.org/_static/gallery.css — 404 — 118 B — 12 ms — h2https://scikit-learn.org/_static/jquery.js/_static/jquery.js https://scikit-learn.org/_static/jquery.js — 404 — 147 B — 16 ms — h2https://scikit-learn.org/_static/underscore.js/_static/underscore.js https://scikit-learn.org/_static/underscore.js — 404 — 175 B — 17 ms — h2https://scikit-learn.org/_static/doctools.js/_static/doctools.js https://scikit-learn.org/_static/doctools.js — 404 — 162 B — 28 ms — h2https://scikit-learn.org/_static/js/copybutton.js/_static/js/copybutton.js https://scikit-learn.org/_static/js/copybutton.js — 404 — 132 B — 23 ms — h2https://scikit-learn.org/_static/js/bootstrap.min.js/_static/js/bootstrap.min.js https://scikit-learn.org/_static/js/bootstrap.min.js — 404 — 173 B — 19 ms — h2http://scikit-learn.github.io/stablescikit-learn.github.io/stable http://scikit-learn.github.io/stable — 307 — 0 B — 11 ms — http/1.1https://scikit-learn.org/_static/favicon.ico/_static/favicon.ico https://scikit-learn.org/_static/favicon.ico — 404 — 5.3 KiB — 7 ms — h2https://scikit-learn.github.io/stablescikit-learn.github.io/stable https://scikit-learn.github.io/stable — 301 — 286 B — 16 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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
29% of JavaScript execution is third-party
First-party Third-party 108ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 108ms
Transfer 0 KB
Monthly Cost $1/mo

How third-party costs are calculated

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