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https://bham.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

Mobile Desktop
89
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.

805 ms

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

1.95 s

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

8 ms

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

0.035

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

1.48 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.

2.03 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
6 PASS 3 REVIEW 4 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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
20 scripts, 408 KB unused
FIX
20 scripts, 408 KB unused
Warning::
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96...: 203 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MM4...: 65 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-...: 58 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: 408 KB
408 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 KB203 KB (51%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MM4Z3Q200 KB65 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 KB58 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-courseSearch-courseSearch.f5e0f0bc2c5e1d28fdc1.mjs2 KB—✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-featuredVideoCards-featuredVideoCards.b9eb621a12669304f62f.mjs1 KB—✓3rd
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/9912.6f4b319dd088322193b5.mjs3 KB—✓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-heroCarousel-heroCarousel.6125ded3f3ddbae73d92.mjs1 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
60 resources · 1.9 MB · 408 KB savings available
FIX
60 resources · 1.9 MB · 408 KB savings available
Warning::
Page weight 935 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~408 KB of savings available
Warning::
59 third-party resources (100% of weight)
Info::
2 resources over 200KB
60 resources · 1.9 MiB · 59 third-party 934.6 KiB over 1MB target
JavaScript 48% · 948.6 KiB
Image 43% · 832.7 KiB
Font 5% · 95.5 KiB
Document 2% · 36.4 KiB
CSS 2% · 32.8 KiB
Other 1% · 12.7 KiB

~407.9 KiB of savings available

Remove unused JavaScript: 407.9 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
Page Weight Budget
Action
1.9 MB transferred, 60 requests
REVIEW
1.9 MB transferred, 60 requests
Info::
Page weighs 4.6 MB (1.9 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::
60 HTTP requests
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
60 requests
0.40 g CO2 per page load
JavaScript 948.6 KiB 48%
Images 811.0 KiB 41%
Fonts 95.5 KiB 5%
HTML 36.4 KiB 2%
CSS 32.8 KiB 2%
Other 21.8 KiB 1%
Other 10.6 KiB 1%
Other 1.3 KiB 0%
Other 616 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

B
JS Execution Cost
810ms total JS execution
REVIEW
810ms total JS execution
Warning::
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96...: 274ms CPU time
Info::
Unattributable: 211ms CPU time
Info::
https://www.birmingham.ac.uk/: 147ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MM4...: 117ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 60ms CPU time
Warning::
Third-party scripts: 810ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 27% Style & Layout 10% Rendering 8% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/vendor.db9cf7f985c05a7d824f.mjs274ms180ms1ms3rd
Unattributable211ms45ms0ms3rd
https://www.birmingham.ac.uk/147ms4ms5ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MM4Z3Q117ms99ms13ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js60ms46ms13ms3rd
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
20 images, 0 KB saveable
PASS
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 811 KB
0 oversized -0 KB
3 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 500 ms 1.0 s 1.5 s 2.0 s FCP 805 ms LCP 1.9 shttps://www.birmingham.ac.uk/fonts/font-larken-regularfont-larken-regular https://www.birmingham.ac.uk/fonts/font-larken-regular — 33.6 KiB — 77 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 — 90 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 — 89 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 — 78 ms — font-display: swap
font-larken-regular woff2 swap
Size 34 KB
Load time 77 ms
Start 238 ms
Risk FOUT — text flashes from fallback to web font
font-larken-bold woff2 swap
Size 34 KB
Load time 90 ms
Start 238 ms
Risk FOUT — text flashes from fallback to web font
xn7_YHE41ni1AdIRqAuZuw1... woff2 swap
Size 14 KB
Load time 89 ms
Start 373 ms
Risk FOUT — text flashes from fallback to web font
xn7_YHE41ni1AdIRqAuZuw1... woff2 swap
Size 14 KB
Load time 78 ms
Start 375 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
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
60 requests over 1873ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 805 ms LCP 1.9 shttps://www.bham.ac.uk// https://www.bham.ac.uk/ — 301 — 133 B — 96 ms — http/1.0https://www.birmingham.ac.uk/www.birmingham.ac.uk/ https://www.birmingham.ac.uk/ — 200 — 36.4 KiB — 163 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 — 77 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 — 90 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 — 77 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 — 106 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 — 92 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 — 91 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 — 106 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 — 200.0 KiB — 227 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 — 404 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 — 104 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 — 84 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 — 155 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 — 120 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 — 98 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 — 126 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 — 100 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 — 132 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... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-heroCarousel-heroCarousel.6125ded3f3ddbae73d92.mjs — 200 — 1.3 KiB — 133 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-courseSearch-courseSearch.f5e0f0bc2c5e1d28fdc1.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-courseSearch-courseSearch.f5e0f0bc2c5e1d28fdc1.mjs — 200 — 1.6 KiB — 134 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-featuredSignpost-featuredSignpost.59f28cadb069cad5e788.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-featuredSignpost-featuredSignpost.59f28cadb069cad5e788.mjs — 200 — 1.1 KiB — 135 ms — h2https://www.birmingham.ac.uk/_s1t51Q_e03e1021-8a96-4a74-83eb-b7ac597b2ec5/static/modern/js/features-featuredVideoCards-featuredVideoCards.b9eb621a12669304f62f.mjswww.birmingham.ac.uk/_s1t51Q_e03e10... 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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 — 708 B — 40 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 — 715 B — 40 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 — 53 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 — 56 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 — 67 ms — h2https://www.birmingham.ac.uk/media-library/header-images/rare-cancer-doctor-and-child-patient.xd5ccd78d.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/rare-cancer-doctor-and-child-patient.xd5ccd78d.jpg?q=80&f=webp&width=948&height=700&fit=crop — 200 — 41.1 KiB — 53 ms — h2https://www.birmingham.ac.uk/media-library/header-images/tasmin-videocard-1.xd7583561.jpg?q=80&f=webp&width=368&height=368&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=368&height=368&fit=crop — 200 — 14.6 KiB — 56 ms — h2https://www.birmingham.ac.uk/media-library/header-images/rishi-videocard-1.x71076db8.jpg?q=80&f=webp&width=368&height=368&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=368&height=368&fit=crop — 200 — 9.4 KiB — 56 ms — h2https://www.birmingham.ac.uk/media-library/header-images/josh-videocard-1.x274fe483.jpg?q=80&f=webp&width=368&height=368&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=368&height=368&fit=crop — 200 — 7.8 KiB — 59 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 — 123.3 KiB — 126 ms — h3https://www.youtube.com/iframe_apiwww.youtube.com/iframe_api https://www.youtube.com/iframe_api — 200 — 3.5 KiB — 103 ms — h2https://apikeys.civiccomputing.com/c/v?d=www.birmingham.ac.uk&p=CookieControl%20Multi-Site&v=9&k=9ed08a87ec1d55aea6b6c3a28ab215528ef42190&format=jsonapikeys.civiccomputing.com/c/v?d=ww... https://apikeys.civiccomputing.com/c/v?d=www.birmingham.ac.uk&p=CookieControl%20Multi-Site&v=9&k=9ed08a87ec1d55aea6b6c3a28ab215528ef42190&format=json — 200 — 616 B — 49 ms — h3https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.jswww.youtube.com/s/player/1bb6ee63/w... https://www.youtube.com/s/player/1bb6ee63/www-widgetapi.vflset/www-widgetapi.js — 200 — 10.6 KiB — 34 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 — 37 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 — 35 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 — 43 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 — 36 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=3&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.birmingham.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=168858773.1776896121&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dMDAwNW&gtm=45He64k0v71582515za200zd71582515xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tft=1776896121434&tfd=1785pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=3&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.birmingham.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=168858773.1776896121&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dMDAwNW&gtm=45He64k0v71582515za200zd71582515xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938465~115938469~117266400&apve=1&apvf=f&apvc=1&tft=1776896121434&tfd=1785 — 200 — 21 B — 88 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 810ms · 759KB · £12/mo
www.birmingham.ac.uk
Other
Costly
Execution 274ms
Transfer 399 KB
Unused 51%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 211ms
Transfer 0 KB
Monthly Cost £3/mo
www.birmingham.ac.uk
Other
Optional
Execution 147ms
Transfer 36 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 117ms
Transfer 200 KB
Unused 32%
Monthly Cost £2/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 60ms
Transfer 123 KB
Unused 47%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.birmingham.ac.uk adds 274ms and costs ~£4/month
  • Unattributable adds 211ms and costs ~£3/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 274ms 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

51% 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 211ms 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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