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https://parliament.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
75
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
58
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
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.

1.27 s

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

2.07 s

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

74 ms

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

0.189

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

1.86 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.

4.10 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
5 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
3.4 MB transferred, 76 requests
FIX
3.4 MB transferred, 76 requests
Warning::
Page weighs 9.5 MB (3.4 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Info::
CSS is 494 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 494 KB
Info::
Fonts are 442 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 442 KB
Info::
76 HTTP requests
Info::
Estimated 0.71 g CO2 per page load
3.4 MB / 2.4 MB budget
3.4 MB transferred
76 requests
0.71 g CO2 per page load
JavaScript 1.8 MiB 54%
Images 597.3 KiB 17%
CSS 493.6 KiB 14%
Fonts 441.8 KiB 13%
HTML 42.3 KiB 1%
Other 5.4 KiB 0%
Other 4.2 KiB 0%
Other 0 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

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 (3.4 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
14 scripts, 375 KB unused
FIX
14 scripts, 375 KB unused
Warning::
https://now.parliament.uk/dist/app.bundle.js?v=LzH...: 150 KB unused (17%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5R2...: 67 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-TNC...: 67 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.parliament.uk/static/js/bundle.js?v=l0...: 63 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cookiemanager.parliament.uk/cookiemanager....: 29 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 375 KB
375 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://now.parliament.uk/dist/app.bundle.js?v=LzHFXAo3diqFj2spuvx3IW6fanVWEdnAknr7KsWsSxI898 KB150 KB (17%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5R2LVTL142 KB67 KB (47%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TNCL6M8133 KB67 KB (50%)✓3rd
https://www.parliament.uk/static/js/bundle.js?v=l0tBrsKjvGr2JOeWeZ1XRfj2tSIn7rJhCISwimn1O9g97 KB63 KB (67%)✓3rd
https://cookiemanager.parliament.uk/cookiemanager.bundle.js50 KB29 KB (58%)✓3rd
https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js17 KB—✓3rd
https://www.parliament.uk/Util/Find/epi-util/find.js4 KB—✓3rd
https://js.monitor.azure.com/scripts/b/ai.2.gbl.min.js46 KB—✓3rd
https://now.parliament.uk/dist/iframeResizer.contentWindow.min.js?v=cQs0BiXXnZQJ9f6nCt5t7WtLkLKuN2OrtKaAtC-UZRQ6 KB—✓3rd
https://cookiemanager.parliament.uk/cookie-manager-v2.js4 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

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

D
Page Weight Inventory
Action
76 resources · 3.4 MB · 375 KB savings available
FIX
76 resources · 3.4 MB · 375 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~375 KB of savings available
Warning::
75 third-party resources (100% of weight)
Info::
2 resources over 200KB
76 resources · 3.4 MiB · 75 third-party 2.4 MiB over 1MB target
JavaScript 54% · 1.8 MiB
Image 17% · 599.7 KiB
CSS 14% · 493.6 KiB
Font 13% · 441.8 KiB
Document 1% · 42.4 KiB
Other 0% · 7.1 KiB

~375.2 KiB of savings available

Remove unused JavaScript: 375.2 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.

C
Image Optimization
Action
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Warning::
https://www.parliament.uk/globalassets/illustratio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/globalassets/illustratio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-si.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-gtp.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/globalassets/illustratio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/globalassets/research-il... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-treatie... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/globalassets/illustratio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-develop... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-erskine... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/parliament-illustrat... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/globalassets/tile-portcu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/globalassets/illustratio... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-wq.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.parliament.uk/img/illustration-dp.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
32 images 597 KB
0 oversized -0 KB
7 legacy format
15 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

C
JS Execution Cost
Action
1404ms total JS execution
REVIEW
1404ms total JS execution
Warning::
https://www.parliament.uk/: 311ms CPU time
Info::
https://now.parliament.uk/dist/app.bundle.js?v=LzH...: 238ms CPU time
Info::
Unattributable: 201ms CPU time
Info::
https://www.parliament.uk/static/js/bundle.js?v=l0...: 107ms CPU time
Info::
https://www.parliament.uk/cdn-cgi/challenge-platfo...: 105ms CPU time
Warning::
Third-party scripts: 1404ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 16% Style & Layout 15% Script Parsing & Compilation 14% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://www.parliament.uk/311ms19ms2ms3rd
https://now.parliament.uk/dist/app.bundle.js?v=LzHFXAo3diqFj2spuvx3IW6fanVWEdnAknr7KsWsSxI238ms123ms98ms3rd
Unattributable201ms3ms0ms3rd
https://www.parliament.uk/static/js/bundle.js?v=l0tBrsKjvGr2JOeWeZ1XRfj2tSIn7rJhCISwimn1O9g107ms78ms14ms3rd
https://www.parliament.uk/cdn-cgi/challenge-platform/scripts/jsd/main.js105ms101ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5R2LVTL104ms85ms18ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-TNCL6M8101ms72ms16ms3rd
https://now.parliament.uk/cdn-cgi/challenge-platform/scripts/jsd/main.js89ms85ms1ms3rd
https://www.parliament.uk/static/js/all.js?v=8IBH4QOd3mZoMFuLhblIZE7dv-HQpTNb3LfsWM9tHGQ78ms21ms52ms3rd
https://js.monitor.azure.com/scripts/b/ai.2.min.js70ms59ms5ms3rd
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
9 fonts (442 KB)
PASS
9 fonts (442 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

442 KB total

Render-blocking

0

of 9

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 2.0 s FCP 1.3 s LCP 2.1 shttps://www.parliament.uk/static/fonts/National-LFS-Semibold.woff2National-LFS-Semibold.w... https://www.parliament.uk/static/fonts/National-LFS-Semibold.woff2 — 37.1 KiB — 32 ms — font-display: swaphttps://www.parliament.uk/static/fonts/National-LFS-Book.woff2National-LFS-Book.woff2 https://www.parliament.uk/static/fonts/National-LFS-Book.woff2 — 36.2 KiB — 50 ms — font-display: swaphttps://www.parliament.uk/static/fonts/fontawesome/fa-solid-900.woff2fa-solid-900.woff2 https://www.parliament.uk/static/fonts/fontawesome/fa-solid-900.woff2 — 75.4 KiB — 38 ms — font-display: swaphttps://www.parliament.uk/static/fonts/fontawesome/fa-brands-400.woff2fa-brands-400.woff2 https://www.parliament.uk/static/fonts/fontawesome/fa-brands-400.woff2 — 75.0 KiB — 35 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAIsKABEAAAACLUAAAInxAAEAAAAAilQAAAC2AAABbQAAAAAAAAAAG4GNFhxwBmAA…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAIsKABEAAAACLUAAAInxAAEAAAAAilQAAAC2AAABbQAAAAAAAAAAG4GNFhxwBmAA… — 34.8 KiB — 27 ms — font-display: swaphttps://now.parliament.uk/dist/fa-solid-900.woff2fa-solid-900.woff2 https://now.parliament.uk/dist/fa-solid-900.woff2 — 76.8 KiB — 40 ms — font-display: swaphttps://now.parliament.uk/dist/National-LFS-Book.woff2National-LFS-Book.woff2 https://now.parliament.uk/dist/National-LFS-Book.woff2 — 35.1 KiB — 52 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAI52ABEAAAACJ8gAAI1dAAEAAAAAjcAAAAC2AAABbQAAAAAAAAAAG/A+HHAGYACK…A+HHAGYACK… data:font/woff2;base64,d09GMgABAAAAAI52ABEAAAACJ8gAAI1dAAEAAAAAjcAAAAC2AAABbQAAAAAAAAAAG/A+HHAGYACK… — 35.6 KiB — 15 ms — font-display: swaphttps://now.parliament.uk/dist/National-LFS-Semibold.woff2National-LFS-Semibold.w... https://now.parliament.uk/dist/National-LFS-Semibold.woff2 — 35.9 KiB — 34 ms — font-display: swap
National-LFS-Semibold.w... woff2 swap
Size 37 KB
Load time 32 ms
Start 391 ms
Risk FOUT — text flashes from fallback to web font
National-LFS-Book.woff2 woff2 swap
Size 36 KB
Load time 50 ms
Start 392 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 75 KB
Load time 38 ms
Start 392 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 75 KB
Load time 35 ms
Start 461 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 35 KB
Load time 27 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 40 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
National-LFS-Book.woff2 woff2 swap
Size 35 KB
Load time 52 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
A+HHAGYACK… woff2 swap
Size 36 KB
Load time 15 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
National-LFS-Semibold.w... woff2 swap
Size 36 KB
Load time 34 ms
Start 1.7 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+
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
76 requests over 1783ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.3 s LCP 2.1 shttps://parliament.uk// https://parliament.uk/ — 301 — 119 B — 73 ms — h2http://www.parliament.uk/www.parliament.uk/ http://www.parliament.uk/ — 307 — 0 B — 2 ms — http/1.1https://www.parliament.uk/www.parliament.uk/ https://www.parliament.uk/ — 200 — 33.1 KiB — 42 ms — h3https://cookiemanager.parliament.uk/cookie-manager-v2.csscookiemanager.parliament.uk/cookie-... https://cookiemanager.parliament.uk/cookie-manager-v2.css — 200 — 1.6 KiB — 50 ms — h3https://cookiemanager.parliament.uk/cookie-manager-v2.jscookiemanager.parliament.uk/cookie-... https://cookiemanager.parliament.uk/cookie-manager-v2.js — 200 — 4.0 KiB — 51 ms — h3https://www.parliament.uk/static/css/bundle.css?v=9UIZAMIz9xhmuq090NEMuNHeJktrGNog8wLLxtnt0HYwww.parliament.uk/static/css/bundle... https://www.parliament.uk/static/css/bundle.css?v=9UIZAMIz9xhmuq090NEMuNHeJktrGNog8wLLxtnt0HY — 200 — 160.8 KiB — 50 ms — h3https://www.parliament.uk/img/parliament-illustration.svgwww.parliament.uk/img/parliament-il... https://www.parliament.uk/img/parliament-illustration.svg — 200 — 2.2 KiB — 28 ms — h3https://www.parliament.uk/contentassets/b186434366d04a95af8db731b5358405/55209736435_076df89c71_o.jpg?format=webp&width=800&quality=85www.parliament.uk/contentassets/b18... https://www.parliament.uk/contentassets/b186434366d04a95af8db731b5358405/55209736435_076df89c71_o.jpg?format=webp&width=800&quality=85 — 200 — 172.3 KiB — 51 ms — h3https://www.parliament.uk/contentassets/41bf0771576b4dbea3c3cab2a484d452/bd338f8c-754d-473e-881c-64de1c594852.jpg?format=webp&width=800&quality=85www.parliament.uk/contentassets/41b... https://www.parliament.uk/contentassets/41bf0771576b4dbea3c3cab2a484d452/bd338f8c-754d-473e-881c-64de1c594852.jpg?format=webp&width=800&quality=85 — 200 — 85.8 KiB — 25 ms — h3https://www.parliament.uk/contentassets/5cba9eec31da4303b8b0dad7947921b1/_h5_7291.jpg?format=webp&width=800&quality=85www.parliament.uk/contentassets/5cb... https://www.parliament.uk/contentassets/5cba9eec31da4303b8b0dad7947921b1/_h5_7291.jpg?format=webp&width=800&quality=85 — 200 — 127.4 KiB — 27 ms — h3https://www.parliament.uk/globalassets/tile-portcullis.png?width=200&quality=85www.parliament.uk/globalassets/tile... https://www.parliament.uk/globalassets/tile-portcullis.png?width=200&quality=85 — 200 — 3.7 KiB — 25 ms — h3https://www.parliament.uk/static/js/all.js?v=8IBH4QOd3mZoMFuLhblIZE7dv-HQpTNb3LfsWM9tHGQwww.parliament.uk/static/js/all.js?... https://www.parliament.uk/static/js/all.js?v=8IBH4QOd3mZoMFuLhblIZE7dv-HQpTNb3LfsWM9tHGQ — 200 — 411.4 KiB — 126 ms — h3https://www.parliament.uk/static/js/bundle.js?v=l0tBrsKjvGr2JOeWeZ1XRfj2tSIn7rJhCISwimn1O9gwww.parliament.uk/static/js/bundle.... 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https://www.parliament.uk/img/favicon.ico — 200 — 2.4 KiB — 23 ms — h3data:image/svg+xml;base64,PHN2ZyBhcmlhLWhpZGRlbj0idHJ1ZSIgY2xhc3M9Imljb24gaWNvbi13aWRlIiB4bWxucz0ia…data:image/svg+xml;base64,PHN2ZyBhc... data:image/svg+xml;base64,PHN2ZyBhcmlhLWhpZGRlbj0idHJ1ZSIgY2xhc3M9Imljb24gaWNvbi13aWRlIiB4bWxucz0ia… — 200 — 0 B — 0 ms — datadata:font/woff2;base64,d09GMgABAAAAAI52ABEAAAACJ8gAAI1dAAEAAAAAjcAAAAC2AAABbQAAAAAAAAAAG/A+HHAGYACK…data:font/woff2;base64,d09GMgABAAAA... data:font/woff2;base64,d09GMgABAAAAAI52ABEAAAACJ8gAAI1dAAEAAAAAjcAAAAC2AAABbQAAAAAAAAAAG/A+HHAGYACK… — 200 — 35.6 KiB — 15 ms — datahttps://now.parliament.uk/dist/National-LFS-Semibold.woff2now.parliament.uk/dist/National-LFS... https://now.parliament.uk/dist/National-LFS-Semibold.woff2 — 200 — 35.9 KiB — 34 ms — h3
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 1404ms · 1761KB · £15/mo
www.parliament.uk
Other
Costly
Execution 311ms
Transfer 33 KB
Monthly Cost £3/mo
now.parliament.uk
Other
Costly
Execution 238ms
Transfer 898 KB
Unused 17%
Monthly Cost £2/mo
Unattributable
Other
Costly
Execution 201ms
Transfer 0 KB
Monthly Cost £2/mo
www.parliament.uk
Other
Optional
Execution 107ms
Transfer 97 KB
Unused 67%
Monthly Cost £1/mo
www.parliament.uk
Other
Optional
Execution 105ms
Transfer 0 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 104ms
Transfer 142 KB
Unused 47%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 101ms
Transfer 133 KB
Unused 50%
Monthly Cost £1/mo
now.parliament.uk
Other
Optional
Execution 89ms
Transfer 0 KB
Monthly Cost £1/mo
www.parliament.uk
Other
Optional
Execution 78ms
Transfer 411 KB
Monthly Cost £1/mo
js.monitor.azure.com
Other
Optional
Execution 70ms
Transfer 46 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.parliament.uk adds 311ms and costs ~£3/month
  • now.parliament.uk adds 238ms and costs ~£2/month
  • Unattributable adds 201ms and costs ~£2/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

www.parliament.uk takes 311ms 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

now.parliament.uk takes 238ms 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

Unattributable takes 201ms 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

67% of www.parliament.uk'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

50% of Google Tag Manager'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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