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https://warwick.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
45
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
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.
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.

7.93 s

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

12.81 s

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

488 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.

7.93 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.

12.86 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 5 REVIEW 2 FIX
F
Page Weight Budget
Action
12.4 MB transferred, 69 requests
FIX
12.4 MB transferred, 69 requests
Critical::
Page weighs 13.5 MB (12.4 MB transferred)
Info::
Fonts are 817 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 817 KB
Info::
69 HTTP requests
Info::
Estimated 2.6 g CO2 per page load
12.4 MB / 2.4 MB budget
12.4 MB transferred
69 requests
2.6 g CO2 per page load
Other 10.6 MiB 85%
Fonts 816.9 KiB 6%
Images 481.0 KiB 4%
JavaScript 382.2 KiB 3%
CSS 131.5 KiB 1%
HTML 22.6 KiB 0%
Other 16.2 KiB 0%
Other 4.8 KiB 0%
Other 996 B 0%
0 2.4 MB 4.9 MB
Over budget

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
2254ms total JS execution
FIX
2254ms total JS execution
Warning::
Unattributable: 857ms CPU time
Warning::
https://d36jn9qou1tztq.cloudfront.net/static_war/s...: 486ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-55N...: 366ms CPU time
Warning::
https://d36jn9qou1tztq.cloudfront.net/static_war/r...: 311ms CPU time
Info::
https://warwick.ac.uk/: 234ms CPU time
Warning::
Third-party scripts: 2020ms (90% of total)

Main Thread Breakdown

Other 41% Style & Layout 26% Script Evaluation 25% Parse HTML & CSS 4% Script Parsing & Compilation 3%
ScriptTotalScriptingParse/CompileParty
Unattributable857ms45ms0ms3rd
https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.145104598012486ms33ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-55N43RF366ms309ms51ms3rd
https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.840265524966311ms151ms20ms3rd
https://warwick.ac.uk/234ms10ms3ms1st
C
Image Optimization
Action
23 images, 0 KB saveable
REVIEW
23 images, 0 KB saveable
Warning::
https://warwick.ac.uk/instagram.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/facebook.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/destination_warwick.webp?max... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/open_days.webp?maxWidth=800 is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/tiktok.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/youtube.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/clearing-2025.webp?maxWidth=... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/linkedin.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://warwick.ac.uk/visit_campus.webp?maxWidth=8... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
23 images 481 KB
0 oversized -0 KB
8 legacy format
10 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

Performance issues directly impact user engagement and conversion rates.

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 Bundles
Action
13 scripts, 132 KB unused
REVIEW
13 scripts, 132 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-55N...: 76 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://d36jn9qou1tztq.cloudfront.net/static_war/r...: 56 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://warwick.ac.uk/study/course-cleaner.js: unminified — 4 KB could be saved
Warning::
https://warwick.ac.uk/hp-2025.js: unminified — 2 KB could be saved
Info::
Total unused JavaScript: 132 KB
132 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-55N43RF185 KB76 KB (41%)✓3rd
https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.84026552496692 KB56 KB (61%)✓3rd
https://warwick.ac.uk/study/course-cleaner.js13 KB—✗1st
https://d36jn9qou1tztq.cloudfront.net/static_war/render/scripts/global-permission.js.3276904427482 KB—✓3rd
https://warwick.ac.uk/hp-2025.js13 KB—✗1st
https://d36jn9qou1tztq.cloudfront.net/static_war/render/statuspage-widget/main.js.18889354009414 KB—✓3rd
https://d36jn9qou1tztq.cloudfront.net/static_site/site.js.2952151327931 KB—✓3rd
https://warwick.ac.uk/study/undergraduate/marketing-modules.js1 KB—✓1st
https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.14510459801217 KB—✓3rd
https://warwick.ac.uk/study/material_information.js10 KB—✗1st

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Page Weight Inventory
Action
69 resources · 12.4 MB · 132 KB savings available
REVIEW
69 resources · 12.4 MB · 132 KB savings available
Warning::
Page weight 11.4 MB over 1MB target
Got: 12.4 MB Expected: ≤ 1 MB
Info::
~132 KB of savings available
Info::
40 third-party resources (10% of weight)
Info::
1 resources over 200KB
69 resources · 12.4 MiB · 40 third-party 11.4 MiB over 1MB target
Media 85% · 10.6 MiB
Font 6% · 816.9 KiB
Image 4% · 494.4 KiB
JavaScript 3% · 382.2 KiB
CSS 1% · 131.5 KiB
Document 0% · 22.6 KiB
Other 0% · 8.6 KiB

~131.7 KiB of savings available

Remove unused JavaScript: 131.7 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache, private, must-revalidate
REVIEW
no-cache, private, must-revalidate
Info::
Cache-Control header is set
Got: no-cache, private, must-revalidate
Info::
ETag present — enables conditional (304) responses
Cache-Control

no-cache, private, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
must-revalidate—Must recheck with server after expiry
A+
Third-Party Impact
10% third-party, 0 ms blocking
PASS
10% third-party, 0 ms blocking
Info::
Third-party code accounts for 10% of page weight (1.2 MiB of 12.4 MiB)
Info::
Third-party blocking time is low (0 ms)
90%
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+
Font Loading
10 fonts (817 KB)
PASS
10 fonts (817 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

817 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 FCP 7.9 s LCP 12.8 shttps://use.typekit.net/af/912d1e/00000000000000007735bb33/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/912d1e/00000000000000007735bb33/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 25.9 KiB — 6 ms — font-display: swaphttps://use.typekit.net/af/c002e2/00000000000000007735bb32/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/c002e2/00000000000000007735bb32/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 28.0 KiB — 9 ms — font-display: swaphttps://use.typekit.net/af/2288cb/00000000000000007735bb39/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/2288cb/00000000000000007735bb39/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 27.2 KiB — 7 ms — font-display: swaphttps://use.typekit.net/af/216c2e/00000000000000007735bb6a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/216c2e/00000000000000007735bb6a/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 25.4 KiB — 10 ms — font-display: swaphttps://use.typekit.net/af/c7a282/00000000000000007735bb62/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/c7a282/00000000000000007735bb62/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 24.1 KiB — 14 ms — font-display: swaphttps://use.typekit.net/af/68dda9/00000000000000007735bb35/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/68dda9/00000000000000007735bb35/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 27.2 KiB — 19 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-light-300.woff2.149420877782fa-light-300.woff2.1494... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-light-300.woff2.149420877782 — 180.5 KiB — 13 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-solid-900.woff2.254471731011fa-solid-900.woff2.2544... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-solid-900.woff2.254471731011 — 134.5 KiB — 16 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-regular-400.woff2.125978268307fa-regular-400.woff2.12... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-regular-400.woff2.125978268307 — 165.5 KiB — 20 ms — font-display: swaphttps://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-duotone-900.woff2.211389069736fa-duotone-900.woff2.21... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-duotone-900.woff2.211389069736 — 178.5 KiB — 20 ms — font-display: swap
l woff2 swap
Size 26 KB
Load time 6 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 28 KB
Load time 9 ms
Start 644 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 7 ms
Start 645 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 25 KB
Load time 10 ms
Start 645 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 24 KB
Load time 14 ms
Start 645 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 27 KB
Load time 19 ms
Start 646 ms
Risk FOUT — text flashes from fallback to web font
fa-light-300.woff2.1494... woff2 swap
Size 181 KB
Load time 13 ms
Start 669 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-solid-900.woff2.2544... woff2 swap
Size 135 KB
Load time 16 ms
Start 670 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-regular-400.woff2.12... woff2 swap
Size 166 KB
Load time 20 ms
Start 670 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-duotone-900.woff2.21... woff2 swap
Size 178 KB
Load time 20 ms
Start 671 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 ~330 KB and ~660 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
Network Waterfall
69 requests over 2020ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 7.9 s LCP 12.8 shttps://warwick.ac.uk// https://warwick.ac.uk/ — 200 — 22.6 KiB — 260 ms — http/1.1https://use.typekit.net/iog2qgq.cssuse.typekit.net/iog2qgq.css https://use.typekit.net/iog2qgq.css — 200 — 1.4 KiB — 73 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/css/pack7-2025-home.css.238215222746d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/css/pack7-2025-home.css.238215222746 — 200 — 102.9 KiB — 77 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/statuspage-widget/main.css.246290990343d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/statuspage-widget/main.css.246290990343 — 200 — 1.4 KiB — 51 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_site/site.css.634450487448d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_site/site.css.634450487448 — 200 — 7.4 KiB — 61 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.840265524966d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/js/id7-bundle-render.js.840265524966 — 200 — 92.3 KiB — 66 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.145104598012d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/sitebuilder.js.145104598012 — 200 — 17.2 KiB — 47 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_site/site.js.295215132793d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_site/site.js.295215132793 — 200 — 993 B — 63 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/scripts/global-permission.js.327690442748d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/scripts/global-permission.js.327690442748 — 200 — 1.5 KiB — 56 ms — h2https://warwick.ac.uk/hp-2025.css?x=2/hp-2025.css?x=2 https://warwick.ac.uk/hp-2025.css?x=2 — 200 — 10.1 KiB — 33 ms — http/1.1https://warwick.ac.uk/static_war/newsbuilder/news.css/static_war/newsbuilder/news.css https://warwick.ac.uk/static_war/newsbuilder/news.css — 302 — 284 B — 39 ms — http/1.1https://warwick.ac.uk/static_war/newsbuilder/categories.css/static_war/newsbuilder/categories.... https://warwick.ac.uk/static_war/newsbuilder/categories.css — 302 — 290 B — 68 ms — http/1.1https://warwick.ac.uk/hp-2025.js/hp-2025.js https://warwick.ac.uk/hp-2025.js — 200 — 12.7 KiB — 75 ms — http/1.1https://warwick.ac.uk/services/marketing/teams/cds/web/toolkit/hero-content-scheduling/wu_stem_landingpage-2.webp/services/marketing/teams/cds/web/t... https://warwick.ac.uk/services/marketing/teams/cds/web/toolkit/hero-content-scheduling/wu_stem_landingpage-2.webp — 200 — 133.5 KiB — 254 ms — 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https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-solid-900.woff2.254471731011 — 200 — 134.5 KiB — 16 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-regular-400.woff2.125978268307d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-regular-400.woff2.125978268307 — 200 — 165.5 KiB — 20 ms — h2https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-duotone-900.woff2.211389069736d36jn9qou1tztq.cloudfront.net/stati... https://d36jn9qou1tztq.cloudfront.net/static_war/render/id7/fonts/fa-duotone-900.woff2.211389069736 — 200 — 178.5 KiB — 20 ms — h2https://status.warwick.ac.uk/api/v2/summary.jsonstatus.warwick.ac.uk/api/v2/summary... https://status.warwick.ac.uk/api/v2/summary.json — 200 — 4.8 KiB — 87 ms — h2https://warwick.ac.uk/static_war/pagemaker/components/render-only/horizontal-scroller.js.130995822242/static_war/pagemaker/components/re... 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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
90% of JavaScript execution is third-party
First-party Third-party 2020ms · 294KB · £21/mo
Unattributable
Other
Costly
Execution 857ms
Transfer 0 KB
Monthly Cost £9/mo
d36jn9qou1tztq.cloudfront.net
Other
Costly
Execution 486ms
Transfer 17 KB
Monthly Cost £5/mo
Google Tag Manager
Tag Manager
Costly
Execution 366ms
Transfer 185 KB
Unused 41%
Monthly Cost £4/mo
d36jn9qou1tztq.cloudfront.net
Other
Costly
Execution 311ms
Transfer 92 KB
Unused 61%
Monthly Cost £3/mo

These scripts may cost more than they're worth

  • Unattributable adds 857ms and costs ~£9/month
  • d36jn9qou1tztq.cloudfront.net adds 486ms and costs ~£5/month
  • Google Tag Manager adds 366ms and costs ~£4/month
  • d36jn9qou1tztq.cloudfront.net adds 311ms and costs ~£3/month

90% 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 857ms 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

d36jn9qou1tztq.cloudfront.net takes 486ms 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 366ms 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

d36jn9qou1tztq.cloudfront.net 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

61% of d36jn9qou1tztq.cloudfront.net'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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