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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
3
REVIEW
3
PASS
9
INFO
2

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

Mobile Desktop
66
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
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.

4.10 s

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

6.35 s

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

0 ms

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

0.000

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

5.18 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.

6.36 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 3 REVIEW 3 FIX
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 (1.4 MiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
58 resources · 1.4 MB · 30 KB savings available
FIX
58 resources · 1.4 MB · 30 KB savings available
Warning::
Page weight 402 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Warning::
57 third-party resources (100% of weight)
58 resources · 1.4 MiB · 57 third-party 402.5 KiB over 1MB target
Image 84% · 1.2 MiB
JavaScript 6% · 92.6 KiB
Font 5% · 75.5 KiB
CSS 2% · 32.0 KiB
Document 2% · 24.0 KiB
Other 1% · 9.7 KiB

~29.6 KiB of savings available

Remove unused JavaScript: 29.6 KiB
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.

B
Page Weight Budget
1.4 MB transferred, 58 requests
REVIEW
1.4 MB transferred, 58 requests
Info::
Page weighs 1.9 MB (1.4 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Info::
58 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
58 requests
0.29 g CO2 per page load
Images 1.2 MiB 83%
JavaScript 92.6 KiB 6%
Fonts 75.5 KiB 5%
CSS 32.0 KiB 2%
HTML 24.0 KiB 2%
Other 10.9 KiB 1%
Other 8.7 KiB 1%
Other 491 B 0%
0 2.4 MB 4.9 MB
Under 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

C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.home-assistant.io/images/press/arstech... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/opensou... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/ct.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/theverg... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/ltt.svg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/frontpage/net... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/product... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/linux.c... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/sponsors/nabu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/troyhun... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/LinuxMa... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/tweaker... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/frontpage/her... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/press/tomshar... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/footer-logo-t... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/frontpage/her... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.home-assistant.io/images/frontpage/her... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 1.2 MB
0 oversized -0 KB
26 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

B
JS Execution Cost
845ms total JS execution
REVIEW
845ms total JS execution
Warning::
Unattributable: 352ms CPU time
Warning::
https://www.home-assistant.io/: 323ms CPU time
Info::
https://code.iconify.design/iconify-icon/2.1.0/ico...: 91ms CPU time
Info::
https://www.home-assistant.io/javascripts/prism.js...: 79ms CPU time
Warning::
Third-party scripts: 845ms (100% of total)

Main Thread Breakdown

Other 43% Style & Layout 23% Script Evaluation 21% Parse HTML & CSS 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
Unattributable352ms6ms0ms3rd
https://www.home-assistant.io/323ms40ms11ms3rd
https://code.iconify.design/iconify-icon/2.1.0/iconify-icon.min.js91ms68ms2ms3rd
https://www.home-assistant.io/javascripts/prism.js?5d6619066a1fc5cd819a93c132b539ac79ms39ms4ms3rd
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
2 fonts (76 KB)
PASS
2 fonts (76 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

76 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.1 s LCP 6.3 shttps://fonts.gstatic.com/s/instrumentsans/v4/pxicypc9vsFDm051Uf6KVwgkfoSbT2lBgGygpg.woff2pxicypc9vsFDm051Uf6KVwg... https://fonts.gstatic.com/s/instrumentsans/v4/pxicypc9vsFDm051Uf6KVwgkfoSbT2lBgGygpg.woff2 — 55.8 KiB — 69 ms — font-display: swaphttps://fonts.gstatic.com/s/figtree/v9/_Xms-HUzqDCFdgfMm4S9DaRvzig.woff2_Xms-HUzqDCFdgfMm4S9DaR... https://fonts.gstatic.com/s/figtree/v9/_Xms-HUzqDCFdgfMm4S9DaRvzig.woff2 — 19.7 KiB — 56 ms — font-display: swap
pxicypc9vsFDm051Uf6KVwg... woff2 swap
Size 56 KB
Load time 69 ms
Start 427 ms
Risk FOUT — text flashes from fallback to web font
_Xms-HUzqDCFdgfMm4S9DaR... woff2 swap
Size 20 KB
Load time 56 ms
Start 427 ms
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
12 scripts, 30 KB unused
PASS
12 scripts, 30 KB unused
Warning::
https://cdn.jsdelivr.net/npm/@docsearch/js@3/dist/...: 30 KB unused (83%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 30 KB
30 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.jsdelivr.net/npm/@docsearch/js@3/dist/umd/index.min.js36 KB30 KB (83%)✓3rd
https://code.iconify.design/iconify-icon/2.1.0/iconify-icon.min.js9 KB—✓3rd
https://cdn.jsdelivr.net/npm/@justinribeiro/lite-youtube@1.3.1/lite-youtube.js3 KB—✓3rd
https://www.home-assistant.io/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js1 KB—✓3rd
https://www.home-assistant.io/javascripts/terminology_tooltip.js?e20ec01246c34f18bd926ceed25bc7421 KB—✓3rd
https://www.home-assistant.io/javascripts/prism.js?5d6619066a1fc5cd819a93c132b539ac18 KB—✓3rd
https://www.home-assistant.io/javascripts/prism-signature.js?c46f2dc6f8d4fd987db580bda61368b51 KB—✓3rd
https://www.home-assistant.io/javascripts/prism-jinja2.js?b7346561200c43c055e61149a77b31873 KB—✓3rd
https://www.home-assistant.io/javascripts/prism-template-links.js?7bedbf54ec266241edb843530c1119033 KB—✓3rd
https://www.home-assistant.io/javascripts/prism-doc-links.js?aecc2ca96596f960444d87dad9394ee34 KB—✓3rd

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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 resource hints configured

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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
58 requests over 596ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.1 s LCP 6.3 shttps://home-assistant.io// https://home-assistant.io/ — 301 — 554 B — 209 ms — h2https://www.home-assistant.io/www.home-assistant.io/ https://www.home-assistant.io/ — 200 — 24.0 KiB — 37 ms — h2https://cdn.jsdelivr.net/npm/@docsearch/css@3/dist/style.min.csscdn.jsdelivr.net/npm/@docsearch/css... https://cdn.jsdelivr.net/npm/@docsearch/css@3/dist/style.min.css — 200 — 3.7 KiB — 73 ms — h2https://www.home-assistant.io/stylesheets/prism.css?1304e8e8c717584921b418a0a8dca04bwww.home-assistant.io/stylesheets/p... https://www.home-assistant.io/stylesheets/prism.css?1304e8e8c717584921b418a0a8dca04b — 200 — 2.5 KiB — 28 ms — h2https://www.home-assistant.io/stylesheets/screen.css?9a7328a851ae2e395f23b5ff3663f74cwww.home-assistant.io/stylesheets/s... https://www.home-assistant.io/stylesheets/screen.css?9a7328a851ae2e395f23b5ff3663f74c — 200 — 24.8 KiB — 32 ms — h2https://fonts.googleapis.com/css2?family=Figtree:ital,wght@0,300..900;1,300..900&family=Instrument+Sans:ital,wdth,wght@0,99,400..700;1,99,400..700&fonts.googleapis.com/css2?family=Fi... https://fonts.googleapis.com/css2?family=Figtree:ital,wght@0,300..900;1,300..900&family=Instrument+Sans:ital,wdth,wght@0,99,400..700;1,99,400..700& — 200 — 1020 B — 118 ms — h2https://code.iconify.design/iconify-icon/2.1.0/iconify-icon.min.jscode.iconify.design/iconify-icon/2.... https://code.iconify.design/iconify-icon/2.1.0/iconify-icon.min.js — 200 — 9.2 KiB — 102 ms — h2https://www.home-assistant.io/images/frontpage/hero-github-logo.svgwww.home-assistant.io/images/frontp... https://www.home-assistant.io/images/frontpage/hero-github-logo.svg — 200 — 1.1 KiB — 29 ms — h2https://www.home-assistant.io/images/frontpage/hero-trophy.svgwww.home-assistant.io/images/frontp... https://www.home-assistant.io/images/frontpage/hero-trophy.svg — 200 — 1.2 KiB — 27 ms — h2https://www.home-assistant.io/images/frontpage/hero_screenshot.pngwww.home-assistant.io/images/frontp... https://www.home-assistant.io/images/frontpage/hero_screenshot.png — 200 — 161.8 KiB — 51 ms — h2https://cdn.jsdelivr.net/npm/@justinribeiro/lite-youtube@1.3.1/lite-youtube.jscdn.jsdelivr.net/npm/@justinribeiro... https://cdn.jsdelivr.net/npm/@justinribeiro/lite-youtube@1.3.1/lite-youtube.js — 200 — 2.8 KiB — 43 ms — h2https://www.home-assistant.io/images/app-loading.webpwww.home-assistant.io/images/app-lo... https://www.home-assistant.io/images/app-loading.webp — 200 — 6.9 KiB — 33 ms — h3https://www.home-assistant.io/images/press/theverge.svgwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/theverge.svg — 200 — 1.4 KiB — 29 ms — h3https://www.home-assistant.io/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.jswww.home-assistant.io/cdn-cgi/scrip... https://www.home-assistant.io/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.min.js — 200 — 1009 B — 20 ms — h3https://cdn.jsdelivr.net/npm/@docsearch/js@3/dist/umd/index.min.jscdn.jsdelivr.net/npm/@docsearch/js@... https://cdn.jsdelivr.net/npm/@docsearch/js@3/dist/umd/index.min.js — 200 — 35.7 KiB — 4 ms — h2https://www.home-assistant.io/images/press/arstechnica.svgwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/arstechnica.svg — 200 — 2.7 KiB — 26 ms — h3https://www.home-assistant.io/images/press/tweakers.pngwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/tweakers.png — 200 — 5.1 KiB — 27 ms — h3https://www.home-assistant.io/images/press/ltt.svgwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/ltt.svg — 200 — 1.5 KiB — 27 ms — h3https://www.home-assistant.io/images/press/troyhunt.jpgwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/troyhunt.jpg — 200 — 8.2 KiB — 90 ms — h3https://www.home-assistant.io/images/press/tomshardware.svgwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/tomshardware.svg — 200 — 2.3 KiB — 58 ms — h3https://www.home-assistant.io/images/press/producthunt.com.pngwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/producthunt.com.png — 200 — 3.0 KiB — 73 ms — h3https://www.home-assistant.io/images/press/linux.com.pngwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/linux.com.png — 200 — 2.3 KiB — 61 ms — h3https://www.home-assistant.io/images/press/opensource.com.svgwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/opensource.com.svg — 200 — 2.3 KiB — 62 ms — h3https://www.home-assistant.io/images/press/LinuxMagazine.pngwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/LinuxMagazine.png — 200 — 2.3 KiB — 73 ms — h3https://www.home-assistant.io/images/press/ct.pngwww.home-assistant.io/images/press/... https://www.home-assistant.io/images/press/ct.png — 200 — 12.8 KiB — 92 ms — h3https://www.home-assistant.io/images/sponsors/nabu_casa.svgwww.home-assistant.io/images/sponso... https://www.home-assistant.io/images/sponsors/nabu_casa.svg — 200 — 2.3 KiB — 63 ms — h3https://www.home-assistant.io/images/footer-logo-text.svgwww.home-assistant.io/images/footer... https://www.home-assistant.io/images/footer-logo-text.svg — 200 — 2.4 KiB — 54 ms — h3https://www.home-assistant.io/images/frontpage/netlify.svgwww.home-assistant.io/images/frontp... https://www.home-assistant.io/images/frontpage/netlify.svg — 200 — 8.4 KiB — 93 ms — h3https://www.home-assistant.io/javascripts/terminology_tooltip.js?e20ec01246c34f18bd926ceed25bc742www.home-assistant.io/javascripts/t... https://www.home-assistant.io/javascripts/terminology_tooltip.js?e20ec01246c34f18bd926ceed25bc742 — 200 — 1.4 KiB — 65 ms — h3https://www.home-assistant.io/javascripts/prism.js?5d6619066a1fc5cd819a93c132b539acwww.home-assistant.io/javascripts/p... https://www.home-assistant.io/javascripts/prism.js?5d6619066a1fc5cd819a93c132b539ac — 200 — 17.6 KiB — 109 ms — h3
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.1 s LCP 6.3 shttps://home-assistant.io// https://home-assistant.io/ — 301 — 554 B — 209 ms — h2https://www.home-assistant.io/www.home-assistant.io/ https://www.home-assistant.io/ — 200 — 24.0 KiB — 37 ms — h2https://cdn.jsdelivr.net/npm/@docsearch/css@3/dist/style.min.csscdn.jsdelivr.net/npm/@docsearch/css... https://cdn.jsdelivr.net/npm/@docsearch/css@3/dist/style.min.css — 200 — 3.7 KiB — 73 ms — h2https://www.home-assistant.io/stylesheets/prism.css?1304e8e8c717584921b418a0a8dca04bwww.home-assistant.io/stylesheets/p... https://www.home-assistant.io/stylesheets/prism.css?1304e8e8c717584921b418a0a8dca04b — 200 — 2.5 KiB — 28 ms — h2https://www.home-assistant.io/stylesheets/screen.css?9a7328a851ae2e395f23b5ff3663f74cwww.home-assistant.io/stylesheets/s... https://www.home-assistant.io/stylesheets/screen.css?9a7328a851ae2e395f23b5ff3663f74c — 200 — 24.8 KiB — 32 ms — h2https://fonts.googleapis.com/css2?family=Figtree:ital,wght@0,300..900;1,300..900&family=Instrument+Sans:ital,wdth,wght@0,99,400..700;1,99,400..700&fonts.googleapis.com/css2?family=Fi... https://fonts.googleapis.com/css2?family=Figtree:ital,wght@0,300..900;1,300..900&family=Instrument+Sans:ital,wdth,wght@0,99,400..700;1,99,400..700& — 200 — 1020 B — 118 ms — h2https://code.iconify.design/iconify-icon/2.1.0/iconify-icon.min.jscode.iconify.design/iconify-icon/2.... https://code.iconify.design/iconify-icon/2.1.0/iconify-icon.min.js — 200 — 9.2 KiB — 102 ms — h2https://www.home-assistant.io/images/frontpage/hero-github-logo.svgwww.home-assistant.io/images/frontp... https://www.home-assistant.io/images/frontpage/hero-github-logo.svg — 200 — 1.1 KiB — 29 ms — h2https://www.home-assistant.io/images/frontpage/hero-trophy.svgwww.home-assistant.io/images/frontp... https://www.home-assistant.io/images/frontpage/hero-trophy.svg — 200 — 1.2 KiB — 27 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
100% of JavaScript execution is third-party
First-party Third-party 845ms · 51KB · €9/mo
Unattributable
Other
Costly
Execution 352ms
Transfer 0 KB
Monthly Cost €4/mo
www.home-assistant.io
Other
Costly
Execution 323ms
Transfer 24 KB
Monthly Cost €4/mo
code.iconify.design
Other
Optional
Execution 91ms
Transfer 9 KB
Monthly Cost €1/mo
www.home-assistant.io
Other
Optional
Execution 79ms
Transfer 18 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 352ms and costs ~€4/month
  • www.home-assistant.io adds 323ms and costs ~€4/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.

Learn more ▾

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

Unattributable takes 352ms 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.home-assistant.io takes 323ms 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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