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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
26
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.
77
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.

2.66 s

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

19.23 s

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

802 ms

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

0.471

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

5.92 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.

20.08 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
8 PASS 2 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 492 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 492 KB
Info::
Fonts are 452 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 452 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 579.9 KiB 17%
CSS 492.2 KiB 14%
Fonts 451.6 KiB 13%
HTML 42.2 KiB 1%
Other 8.2 KiB 0%
Other 2.4 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
JS Execution Cost
Action
3486ms total JS execution
FIX
3486ms total JS execution
Warning::
Unattributable: 612ms CPU time
Warning::
https://now.parliament.uk/dist/app.bundle.js?v=LzH...: 540ms CPU time
Warning::
https://www.parliament.uk/: 491ms CPU time
Warning::
https://www.parliament.uk/static/js/bundle.js?v=l0...: 302ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5R2...: 254ms CPU time
Warning::
Third-party scripts: 2292ms (66% of total)

Main Thread Breakdown

Script Evaluation 46% Other 20% Script Parsing & Compilation 14% Style & Layout 10% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
Unattributable612ms6ms0ms3rd
https://now.parliament.uk/dist/app.bundle.js?v=LzHFXAo3diqFj2spuvx3IW6fanVWEdnAknr7KsWsSxI540ms281ms210ms3rd
https://www.parliament.uk/491ms44ms5ms1st
https://www.parliament.uk/static/js/bundle.js?v=l0tBrsKjvGr2JOeWeZ1XRfj2tSIn7rJhCISwimn1O9g302ms222ms28ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-5R2LVTL254ms190ms45ms3rd
https://www.parliament.uk/cdn-cgi/challenge-platform/scripts/jsd/main.js232ms211ms2ms1st
https://www.googletagmanager.com/gtm.js?id=GTM-TNCL6M8224ms163ms48ms3rd
https://now.parliament.uk/cdn-cgi/challenge-platform/scripts/jsd/main.js195ms182ms2ms3rd
https://www.parliament.uk/static/js/all.js?v=8IBH4QOd3mZoMFuLhblIZE7dv-HQpTNb3LfsWM9tHGQ169ms36ms123ms1st
https://js.monitor.azure.com/scripts/b/ai.2.min.js135ms117ms11ms3rd

Showing top 10 of 14 scripts

D
JS Bundles
Action
14 scripts, 376 KB unused
FIX
14 scripts, 376 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...: 64 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: 376 KB
376 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=l0tBrsKjvGr2JOeWeZ1XRfj2tSIn7rJhCISwimn1O9g96 KB64 KB (67%)✓1st
https://cookiemanager.parliament.uk/cookiemanager.bundle.js50 KB29 KB (58%)✓3rd
https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js17 KB—✓3rd
https://cookiemanager.parliament.uk/cookie-manager-v2.js4 KB—✓3rd
https://www.parliament.uk/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?13 KB—✓1st
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

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 · 376 KB savings available
FIX
76 resources · 3.4 MB · 376 KB savings available
Warning::
Page weight 2.4 MB over 1MB target
Got: 3.4 MB Expected: ≤ 1 MB
Info::
~376 KB of savings available
Warning::
33 third-party resources (56% of weight)
Info::
2 resources over 200KB
76 resources · 3.4 MiB · 33 third-party 2.4 MiB over 1MB target
JavaScript 54% · 1.8 MiB
Image 17% · 581.0 KiB
CSS 14% · 492.2 KiB
Font 13% · 451.6 KiB
Document 1% · 47.0 KiB
Other 0% · 4.6 KiB

~376.0 KiB of savings available

Remove unused JavaScript: 376.0 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
Third-Party Impact
56% third-party, 0 ms blocking
REVIEW
56% third-party, 0 ms blocking
Warning::
Third-party code accounts for 56% of page weight (1.9 MiB of 3.4 MiB)
Info::
Third-party blocking time is low (0 ms)
44%
56%
First-party Third-party
C
Image Optimization
Action
33 images, 0 KB saveable
REVIEW
33 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/research-il... 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/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-treatie... 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/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-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-dp.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/tile-portcu... 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.
33 images 580 KB
0 oversized -0 KB
7 legacy format
14 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

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
10 fonts (452 KB)
PASS
10 fonts (452 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

452 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 2.7 s LCP 19.2 shttps://www.parliament.uk/static/fonts/National-LFS-Semibold.woff2National-LFS-Semibold.w... https://www.parliament.uk/static/fonts/National-LFS-Semibold.woff2 — 35.8 KiB — 54 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 — 34.9 KiB — 61 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 — 74.1 KiB — 65 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 — 73.8 KiB — 62 ms — font-display: swaphttps://www.parliament.uk/static/fonts/fontawesome/fa-regular-400.woff2fa-regular-400.woff2 https://www.parliament.uk/static/fonts/fontawesome/fa-regular-400.woff2 — 14.7 KiB — 42 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAIsKABEAAAACLUAAAInxAAEAAAAAilQAAAC2AAABbQAAAAAAAAAAG4GNFhxwBmAA…woff2;base64,d09GMgABAA... data:font/woff2;base64,d09GMgABAAAAAIsKABEAAAACLUAAAInxAAEAAAAAilQAAAC2AAABbQAAAAAAAAAAG4GNFhxwBmAA… — 34.8 KiB — 33 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 — 52 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 — 53 ms — font-display: swapdata:font/woff2;base64,d09GMgABAAAAAI52ABEAAAACJ8gAAI1dAAEAAAAAjcAAAAC2AAABbQAAAAAAAAAAG/A+HHAGYACK…A+HHAGYACK… data:font/woff2;base64,d09GMgABAAAAAI52ABEAAAACJ8gAAI1dAAEAAAAAjcAAAAC2AAABbQAAAAAAAAAAG/A+HHAGYACK… — 35.6 KiB — 8 ms — font-display: swaphttps://now.parliament.uk/dist/National-LFS-Semibold.woff2National-LFS-Semibold.w... https://now.parliament.uk/dist/National-LFS-Semibold.woff2 — 36.2 KiB — 49 ms — font-display: swap
National-LFS-Semibold.w... woff2 swap
Size 36 KB
Load time 54 ms
Start 290 ms
Risk FOUT — text flashes from fallback to web font
National-LFS-Book.woff2 woff2 swap
Size 35 KB
Load time 61 ms
Start 290 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 74 KB
Load time 65 ms
Start 290 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 74 KB
Load time 62 ms
Start 291 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 15 KB
Load time 42 ms
Start 700 ms
Risk FOUT — text flashes from fallback to web font
woff2;base64,d09GMgABAA... woff2 swap
Size 35 KB
Load time 33 ms
Start 921 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 52 ms
Start 929 ms
Risk FOUT — text flashes from fallback to web font
National-LFS-Book.woff2 woff2 swap
Size 35 KB
Load time 53 ms
Start 929 ms
Risk FOUT — text flashes from fallback to web font
A+HHAGYACK… woff2 swap
Size 36 KB
Load time 8 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
National-LFS-Semibold.w... woff2 swap
Size 36 KB
Load time 49 ms
Start 1.4 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
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
76 requests over 1413ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 2.7 s LCP 19.2 shttps://www.parliament.uk// https://www.parliament.uk/ — 200 — 33.0 KiB — 85 ms — h2https://cookiemanager.parliament.uk/cookie-manager-v2.csscookiemanager.parliament.uk/cookie-... https://cookiemanager.parliament.uk/cookie-manager-v2.css — 200 — 1.6 KiB — 105 ms — h3https://cookiemanager.parliament.uk/cookie-manager-v2.jscookiemanager.parliament.uk/cookie-... https://cookiemanager.parliament.uk/cookie-manager-v2.js — 200 — 4.0 KiB — 103 ms — h3https://www.parliament.uk/static/css/bundle.css?v=9UIZAMIz9xhmuq090NEMuNHeJktrGNog8wLLxtnt0HY/static/css/bundle.css?v=9UIZAMIz9x... https://www.parliament.uk/static/css/bundle.css?v=9UIZAMIz9xhmuq090NEMuNHeJktrGNog8wLLxtnt0HY — 200 — 159.6 KiB — 69 ms — h2https://www.parliament.uk/img/parliament-illustration.svg/img/parliament-illustration.svg https://www.parliament.uk/img/parliament-illustration.svg — 200 — 867 B — 76 ms — h2https://www.parliament.uk/contentassets/b186434366d04a95af8db731b5358405/55209736435_076df89c71_o.jpg?format=webp&width=800&quality=85/contentassets/b186434366d04a95af8d... https://www.parliament.uk/contentassets/b186434366d04a95af8db731b5358405/55209736435_076df89c71_o.jpg?format=webp&width=800&quality=85 — 200 — 172.2 KiB — 80 ms — h2https://www.parliament.uk/contentassets/41bf0771576b4dbea3c3cab2a484d452/bd338f8c-754d-473e-881c-64de1c594852.jpg?format=webp&width=800&quality=85/contentassets/41bf0771576b4dbea3c3... https://www.parliament.uk/contentassets/41bf0771576b4dbea3c3cab2a484d452/bd338f8c-754d-473e-881c-64de1c594852.jpg?format=webp&width=800&quality=85 — 200 — 85.6 KiB — 40 ms — h2https://www.parliament.uk/contentassets/5cba9eec31da4303b8b0dad7947921b1/_h5_7291.jpg?format=webp&width=800&quality=85/contentassets/5cba9eec31da4303b8b0... https://www.parliament.uk/contentassets/5cba9eec31da4303b8b0dad7947921b1/_h5_7291.jpg?format=webp&width=800&quality=85 — 200 — 127.3 KiB — 42 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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
66% of JavaScript execution is third-party
First-party Third-party 2292ms · 1484KB · £24/mo
Unattributable
Other
Costly
Execution 612ms
Transfer 0 KB
Monthly Cost £6/mo
now.parliament.uk
Other
Costly
Execution 540ms
Transfer 898 KB
Unused 17%
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 254ms
Transfer 142 KB
Unused 47%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 224ms
Transfer 133 KB
Unused 50%
Monthly Cost £2/mo
now.parliament.uk
Other
Optional
Execution 195ms
Transfer 0 KB
Monthly Cost £2/mo
js.monitor.azure.com
Other
Optional
Execution 135ms
Transfer 46 KB
Monthly Cost £1/mo
js.monitor.azure.com
Other
Optional
Execution 100ms
Transfer 46 KB
Monthly Cost £1/mo
now.parliament.uk
Other
Optional
Execution 98ms
Transfer 9 KB
Monthly Cost £1/mo
cookiemanager.parliament.uk
Other
Optional
Execution 79ms
Transfer 50 KB
Unused 58%
Monthly Cost £1/mo
now.parliament.uk
Other
Optional
Execution 54ms
Transfer 160 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 612ms and costs ~£6/month
  • now.parliament.uk adds 540ms and costs ~£6/month
  • Google Tag Manager adds 254ms and costs ~£3/month
  • Google Tag Manager adds 224ms and costs ~£2/month

66% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 612ms 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 540ms 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

Google Tag Manager takes 254ms 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

Google Tag Manager takes 224ms 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

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

58% of cookiemanager.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

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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