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https://birmingham.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
39
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.

8.07 s

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

12.07 s

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

730 ms

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

0.057

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

8.07 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.

12.14 s

Page Load Progression

480 ms
960 ms
1.4 s
1.9 s
2.4 s
2.9 s
3.4 s
3.8 s
Checks
17
8 PASS 2 REVIEW 5 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4524ms total JS execution
FIX
4524ms total JS execution
Warning::
https://www.birmingham.ac.uk/: 1049ms CPU time
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 1005ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MM4...: 909ms CPU time
Warning::
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96...: 836ms CPU time
Warning::
Unattributable: 724ms CPU time
Warning::
Third-party scripts: 4524ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 26% Style & Layout 11% Rendering 8% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.birmingham.ac.uk/1049ms299ms28ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js1005ms877ms63ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MM4Z3Q909ms661ms102ms3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/vendor.db9cf7f985c05a7d824f.mjs836ms381ms8ms3rd
Unattributable724ms12ms0ms3rd
D
JS Bundles
Action
20 scripts, 413 KB unused
FIX
20 scripts, 413 KB unused
Warning::
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96...: 208 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MM4...: 64 KB unused (32%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96...: 59 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 57 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96...: 23 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 413 KB
413 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/vendor.db9cf7f985c05a7d824f.mjs399 KB208 KB (52%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MM4Z3Q200 KB64 KB (32%)✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/1443.a781644dc0ed3f47e50a.mjs125 KB59 KB (48%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB57 KB (47%)✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/app.767925685fd9a88fbd61.mjs62 KB23 KB (37%)✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-composer-ComposerWrapper.a0da5f9364aa8b141e84.mjs3 KB—✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-courseSearch-courseSearch.f5e0f0bc2c5e1d28fdc1.mjs2 KB—✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/home.page.91727cb6cd45ebf6e659.mjs1 KB—✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/startup-3.0.1.js2 KB—✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/9912.6f4b319dd088322193b5.mjs3 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

F
Page Weight Inventory
Action
57 resources · 1.5 MB · 413 KB savings available
FIX
57 resources · 1.5 MB · 413 KB savings available
Warning::
Page weight 524 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~413 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
2 resources over 200KB
57 resources · 1.5 MiB · 56 third-party 523.9 KiB over 1MB target
JavaScript 61% · 948.8 KiB
Image 27% · 422.2 KiB
Font 6% · 95.5 KiB
Document 2% · 35.9 KiB
CSS 2% · 32.8 KiB
Other 1% · 12.7 KiB

~412.6 KiB of savings available

Remove unused JavaScript: 412.6 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
1.5 MB transferred, 57 requests
REVIEW
1.5 MB transferred, 57 requests
Info::
Page weighs 4.2 MB (1.5 MB transferred)
Warning::
JavaScript is 949 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 949 KB
Info::
57 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
57 requests
0.32 g CO2 per page load
JavaScript 948.8 KiB 61%
Images 400.5 KiB 26%
Fonts 95.5 KiB 6%
HTML 35.9 KiB 2%
CSS 32.8 KiB 2%
Other 21.8 KiB 1%
Other 10.6 KiB 1%
Other 1.3 KiB 0%
Other 617 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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
Image Optimization
17 images, 0 KB saveable
PASS
17 images, 0 KB saveable
Info::
All images are well-optimized
17 images 401 KB
0 oversized -0 KB
2 legacy format
0 missing dimensions CLS risk
A+
Font Loading
4 fonts (96 KB)
PASS
4 fonts (96 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

96 KB total

Render-blocking

0

of 4

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 8.1 s LCP 12.1 shttps://www.birmingham.ac.uk/fonts/font-larken-regularfont-larken-regular https://www.birmingham.ac.uk/fonts/font-larken-regular — 33.6 KiB — 649 ms — font-display: swaphttps://www.birmingham.ac.uk/fonts/font-larken-boldfont-larken-bold https://www.birmingham.ac.uk/fonts/font-larken-bold — 34.2 KiB — 489 ms — font-display: swaphttps://fonts.gstatic.com/s/manrope/v20/xn7_YHE41ni1AdIRqAuZuw1Bx9mbZk4aE9_C-bk.woff2xn7_YHE41ni1AdIRqAuZuw1... https://fonts.gstatic.com/s/manrope/v20/xn7_YHE41ni1AdIRqAuZuw1Bx9mbZk4aE9_C-bk.woff2 — 13.9 KiB — 24 ms — font-display: swaphttps://fonts.gstatic.com/s/manrope/v20/xn7_YHE41ni1AdIRqAuZuw1Bx9mbZk79FN_C-bk.woff2xn7_YHE41ni1AdIRqAuZuw1... https://fonts.gstatic.com/s/manrope/v20/xn7_YHE41ni1AdIRqAuZuw1Bx9mbZk79FN_C-bk.woff2 — 13.8 KiB — 24 ms — font-display: swap
font-larken-regular woff2 swap
Size 34 KB
Load time 649 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
font-larken-bold woff2 swap
Size 34 KB
Load time 489 ms
Start 1.2 s
Risk FOUT — text flashes from fallback to web font
xn7_YHE41ni1AdIRqAuZuw1... woff2 swap
Size 14 KB
Load time 24 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
xn7_YHE41ni1AdIRqAuZuw1... woff2 swap
Size 14 KB
Load time 24 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
6
dns-prefetch
—
prefetch
—

6 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
Network Waterfall
57 requests over 3264ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 8.1 s LCP 12.1 shttps://birmingham.ac.uk// https://birmingham.ac.uk/ — 301 — 133 B — 651 ms — http/1.0https://www.birmingham.ac.uk/www.birmingham.ac.uk/ https://www.birmingham.ac.uk/ — 200 — 35.9 KiB — 710 ms — h2https://www.birmingham.ac.uk/fonts/font-larken-regularwww.birmingham.ac.uk/fonts/font-lar... https://www.birmingham.ac.uk/fonts/font-larken-regular — 200 — 33.6 KiB — 649 ms — h2https://www.birmingham.ac.uk/fonts/font-larken-boldwww.birmingham.ac.uk/fonts/font-lar... https://www.birmingham.ac.uk/fonts/font-larken-bold — 200 — 34.2 KiB — 489 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/css/vendor.csswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/css/vendor.css — 200 — 32.8 KiB — 488 ms — h2https://www.birmingham.ac.uk/Images/logos/uob/uob-uk-logo-light.svgwww.birmingham.ac.uk/Images/logos/u... https://www.birmingham.ac.uk/Images/logos/uob/uob-uk-logo-light.svg — 200 — 50.8 KiB — 522 ms — h2https://www.birmingham.ac.uk/media-library/header-images/open-days-june26-father-son-hc1-2.x56f504b4.jpg?q=80&f=webp&width=288&height=150&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/open-days-june26-father-son-hc1-2.x56f504b4.jpg?q=80&f=webp&width=288&height=150&fit=crop — 200 — 8.8 KiB — 482 ms — h2https://www.birmingham.ac.uk/media-library/header-images/open-days-june26-father-son-hc1-2.x56f504b4.jpg?q=80&f=webp&width=496&height=150&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/open-days-june26-father-son-hc1-2.x56f504b4.jpg?q=80&f=webp&width=496&height=150&fit=crop — 200 — 11.7 KiB — 478 ms — h2https://www.birmingham.ac.uk/media-library/header-images/open-days-june26-father-son-hc1-2.x56f504b4.jpg?q=80&f=webp&width=948&height=700&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/open-days-june26-father-son-hc1-2.x56f504b4.jpg?q=80&f=webp&width=948&height=700&fit=crop — 200 — 50.5 KiB — 648 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-MM4Z3Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-MM4Z3Q — 200 — 200.2 KiB — 59 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/manifest.webmanifestwww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/manifest.webmanifest — 200 — 1.3 KiB — 815 ms — h2https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.jscc.cdn.civiccomputing.com/9/cookieC... https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js — 200 — 123.4 KiB — 42 ms — h3https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.5 KiB — 33 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/startup-3.0.1.jswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/startup-3.0.1.js — 200 — 1.6 KiB — 413 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/runtime.042d4bdc7b573c5a7690.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/runtime.042d4bdc7b573c5a7690.mjs — 200 — 5.2 KiB — 413 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/vendor.db9cf7f985c05a7d824f.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/vendor.db9cf7f985c05a7d824f.mjs — 200 — 399.0 KiB — 788 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/app.767925685fd9a88fbd61.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/app.767925685fd9a88fbd61.mjs — 200 — 62.1 KiB — 427 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/home.page.91727cb6cd45ebf6e659.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/home.page.91727cb6cd45ebf6e659.mjs — 200 — 1.4 KiB — 419 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/1443.a781644dc0ed3f47e50a.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/1443.a781644dc0ed3f47e50a.mjs — 200 — 125.1 KiB — 801 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/9912.6f4b319dd088322193b5.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/9912.6f4b319dd088322193b5.mjs — 200 — 3.3 KiB — 589 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-composer-ComposerWrapper.a0da5f9364aa8b141e84.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-composer-ComposerWrapper.a0da5f9364aa8b141e84.mjs — 200 — 3.5 KiB — 592 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-heroCarousel-heroCarousel.6125ded3f3ddbae73d92.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... 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h2https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?linkDepth=1&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.contentTypeId%22%2C%22equalTo%22%3A%22alertBanner%22%7D%2C%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22activateBanner%22%2C%22equalTo%22%3Atrue%7D%2C%7B%22field%22%3A%22bannerPath%22%2C%22equalTo%22%3A%22%2F%22%7D%5Dwww.birmingham.ac.uk/api/delivery/p... https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?linkDepth=1&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.contentTypeId%22%2C%22equalTo%22%3A%22alertBanner%22%7D%2C%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22activateBanner%22%2C%22equalTo%22%3Atrue%7D%2C%7B%22field%22%3A%22bannerPath%22%2C%22equalTo%22%3A%22%2F%22%7D%5D — 200 — 707 B — 180 ms — h2https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?linkDepth=1&orderBy=%5B%7B%22desc%22%3A%22sys.version.published%22%7D%5D&pageIndex=0&pageSize=1&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22equalTo%22%3A%22globalNews%22%7D%5Dwww.birmingham.ac.uk/api/delivery/p... https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?linkDepth=1&orderBy=%5B%7B%22desc%22%3A%22sys.version.published%22%7D%5D&pageIndex=0&pageSize=1&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22equalTo%22%3A%22globalNews%22%7D%5D — 200 — 717 B — 182 ms — h2https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?fields=entryTitle%2CentryDescription%2Csys.contentTypeId%2Csys.slug%2Csys.uri%2Csys.version.published%2CsearchDataUrl%2CsearchDataDescription%2CsearchDataKeywords%2CsearchDataKeywords%2Cdescription%2CincludeInSearch%2Csys.metadata.includeInSearch%2Csys.isPublished%2CarticleType%2CmetaInfo.metaImage%2Csys.uri%2CacademicLevelTitle&linkDepth=1&orderBy=%5B%7B%22desc%22%3A%22academicLevelTitle%22%7D%5D&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22in%22%3A%5B%22academicLevel%22%5D%7D%5Dwww.birmingham.ac.uk/api/delivery/p... https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?fields=entryTitle%2CentryDescription%2Csys.contentTypeId%2Csys.slug%2Csys.uri%2Csys.version.published%2CsearchDataUrl%2CsearchDataDescription%2CsearchDataKeywords%2CsearchDataKeywords%2Cdescription%2CincludeInSearch%2Csys.metadata.includeInSearch%2Csys.isPublished%2CarticleType%2CmetaInfo.metaImage%2Csys.uri%2CacademicLevelTitle&linkDepth=1&orderBy=%5B%7B%22desc%22%3A%22academicLevelTitle%22%7D%5D&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22in%22%3A%5B%22academicLevel%22%5D%7D%5D — 200 — 985 B — 176 ms — h2https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?fields=entryTitle%2CentryDescription%2Csys.contentTypeId%2Csys.slug%2Csys.uri%2Csys.version.published%2CsearchDataUrl%2CsearchDataDescription%2CsearchDataKeywords%2CsearchDataKeywords%2Cdescription%2CincludeInSearch%2Csys.metadata.includeInSearch%2Csys.isPublished%2CarticleType%2CmetaInfo.metaImage%2Csys.uri%2Ctitle&linkDepth=1&orderBy=%5B%7B%22asc%22%3A%22title%22%7D%5D&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22in%22%3A%5B%22courseStructure%22%5D%7D%5Dwww.birmingham.ac.uk/api/delivery/p... https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?fields=entryTitle%2CentryDescription%2Csys.contentTypeId%2Csys.slug%2Csys.uri%2Csys.version.published%2CsearchDataUrl%2CsearchDataDescription%2CsearchDataKeywords%2CsearchDataKeywords%2Cdescription%2CincludeInSearch%2Csys.metadata.includeInSearch%2Csys.isPublished%2CarticleType%2CmetaInfo.metaImage%2Csys.uri%2Ctitle&linkDepth=1&orderBy=%5B%7B%22asc%22%3A%22title%22%7D%5D&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22in%22%3A%5B%22courseStructure%22%5D%7D%5D — 200 — 975 B — 178 ms — h2https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?fields=entryTitle%2CentryDescription%2Csys.contentTypeId%2Csys.slug%2Csys.uri%2Csys.version.published%2CsearchDataUrl%2CsearchDataDescription%2CsearchDataKeywords%2CsearchDataKeywords%2Cdescription%2CincludeInSearch%2Csys.metadata.includeInSearch%2Csys.isPublished%2CarticleType%2CmetaInfo.metaImage%2Csys.uri%2Ctitle&linkDepth=1&orderBy=%5B%7B%22asc%22%3A%22title%22%7D%5D&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22in%22%3A%5B%22courseVariation%22%5D%7D%5Dwww.birmingham.ac.uk/api/delivery/p... https://www.birmingham.ac.uk/api/delivery/projects/website/entries/search?fields=entryTitle%2CentryDescription%2Csys.contentTypeId%2Csys.slug%2Csys.uri%2Csys.version.published%2CsearchDataUrl%2CsearchDataDescription%2CsearchDataKeywords%2CsearchDataKeywords%2Cdescription%2CincludeInSearch%2Csys.metadata.includeInSearch%2Csys.isPublished%2CarticleType%2CmetaInfo.metaImage%2Csys.uri%2Ctitle&linkDepth=1&orderBy=%5B%7B%22asc%22%3A%22title%22%7D%5D&pageIndex=0&pageSize=20&where=%5B%7B%22field%22%3A%22sys.versionStatus%22%2C%22equalTo%22%3A%22published%22%7D%2C%7B%22field%22%3A%22sys.contentTypeId%22%2C%22in%22%3A%5B%22courseVariation%22%5D%7D%5D — 200 — 1.8 KiB — 172 ms — h2https://www.birmingham.ac.uk/media-library/header-images/rare-cancer-doctor-and-child-patient.xd5ccd78d.jpg?q=80&f=webp&width=496&height=261&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/rare-cancer-doctor-and-child-patient.xd5ccd78d.jpg?q=80&f=webp&width=496&height=261&fit=crop — 200 — 15.2 KiB — 187 ms — h2https://www.birmingham.ac.uk/media-library/header-images/tasmin-videocard-1.xd7583561.jpg?q=80&f=webp&width=403&height=264&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/tasmin-videocard-1.xd7583561.jpg?q=80&f=webp&width=403&height=264&fit=crop — 200 — 11.9 KiB — 185 ms — h2https://www.birmingham.ac.uk/media-library/header-images/rishi-videocard-1.x71076db8.jpg?q=80&f=webp&width=403&height=264&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/rishi-videocard-1.x71076db8.jpg?q=80&f=webp&width=403&height=264&fit=crop — 200 — 8.5 KiB — 187 ms — h2https://www.birmingham.ac.uk/media-library/header-images/josh-videocard-1.x274fe483.jpg?q=80&f=webp&width=403&height=264&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/josh-videocard-1.x274fe483.jpg?q=80&f=webp&width=403&height=264&fit=crop — 200 — 6.4 KiB — 186 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon-48x48.icowww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon-48x48.ico — 200 — 10.1 KiB — 178 ms — h2https://www.birmingham.ac.uk/media-library/header-images/woman-holding-phone.xa6ce6d28.jpg?q=80&f=webp&width=404&height=184&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/woman-holding-phone.xa6ce6d28.jpg?q=80&f=webp&width=404&height=184&fit=crop — 200 — 7.7 KiB — 178 ms — h2https://www.birmingham.ac.uk/media-library/header-images/alice-roberts-1152x692px.xbc103d8a.JPG?q=80&f=webp&width=404&height=184&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/alice-roberts-1152x692px.xbc103d8a.JPG?q=80&f=webp&width=404&height=184&fit=crop — 200 — 9.3 KiB — 181 ms — h2https://www.birmingham.ac.uk/media-library/header-images/cancer-child-patient.xf5e8f75a.jpg?q=80&f=webp&width=404&height=184&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/cancer-child-patient.xf5e8f75a.jpg?q=80&f=webp&width=404&height=184&fit=crop — 200 — 9.7 KiB — 188 ms — h2https://www.birmingham.ac.uk/media-library/header-images/wccc-lead-image.x17546704.jpg?q=80&f=webp&width=404&height=184&fit=cropwww.birmingham.ac.uk/media-library/... https://www.birmingham.ac.uk/media-library/header-images/wccc-lead-image.x17546704.jpg?q=80&f=webp&width=404&height=184&fit=crop — 200 — 10.5 KiB — 179 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon-32x32.icowww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon-32x32.ico — 200 — 4.9 KiB — 173 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon-16x16.icowww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon-16x16.ico — 200 — 1.8 KiB — 173 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon.icowww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/img/icons/favicon.ico — 200 — 4.9 KiB — 178 ms — h2
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 4524ms · 759KB · £67/mo
www.birmingham.ac.uk
Other
Costly
Execution 1049ms
Transfer 36 KB
Monthly Cost £16/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 1005ms
Transfer 123 KB
Unused 47%
Monthly Cost £15/mo
Google Tag Manager
Tag Manager
Costly
Execution 909ms
Transfer 200 KB
Unused 32%
Monthly Cost £13/mo
www.birmingham.ac.uk
Other
Costly
Execution 836ms
Transfer 399 KB
Unused 52%
Monthly Cost £12/mo
Unattributable
Other
Costly
Execution 724ms
Transfer 0 KB
Monthly Cost £11/mo

These scripts may cost more than they're worth

  • www.birmingham.ac.uk adds 1049ms and costs ~£16/month
  • cc.cdn.civiccomputing.com adds 1005ms and costs ~£15/month
  • Google Tag Manager adds 909ms and costs ~£13/month
  • www.birmingham.ac.uk adds 836ms and costs ~£12/month
  • Unattributable adds 724ms and costs ~£11/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.birmingham.ac.uk takes 1049ms 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

cc.cdn.civiccomputing.com takes 1005ms 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 909ms 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.birmingham.ac.uk takes 836ms 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

52% of www.birmingham.ac.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

Unattributable takes 724ms 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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