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https://lboro.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
85
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.
92
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.30 s

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

1.76 s

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

19 ms

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

0.019

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

2.19 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.

2.32 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 4 REVIEW 3 FIX
F
Page Weight Budget
Action
3.2 MB transferred, 58 requests
FIX
3.2 MB transferred, 58 requests
Warning::
Page weighs 5.1 MB (3.2 MB transferred)
Warning::
Images are 2.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.4 MB
Warning::
JavaScript is 576 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 576 KB
Info::
58 HTTP requests
Info::
Estimated 0.66 g CO2 per page load
3.2 MB / 2.4 MB budget
3.2 MB transferred
58 requests
0.66 g CO2 per page load
Images 2.4 MiB 75%
JavaScript 576.2 KiB 18%
Fonts 150.4 KiB 5%
CSS 80.7 KiB 2%
HTML 12.9 KiB 0%
Other 2.6 KiB 0%
Other 1.9 KiB 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.2 MiB of 3.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
58 resources · 3.2 MB · 269 KB savings available
FIX
58 resources · 3.2 MB · 269 KB savings available
Warning::
Page weight 2.2 MB over 1MB target
Got: 3.2 MB Expected: ≤ 1 MB
Info::
~269 KB of savings available
Warning::
57 third-party resources (100% of weight)
Info::
2 resources over 200KB
58 resources · 3.2 MiB · 57 third-party 2.2 MiB over 1MB target
Image 75% · 2.4 MiB
JavaScript 18% · 576.2 KiB
Font 5% · 150.4 KiB
CSS 2% · 80.7 KiB
Document 0% · 13.5 KiB
Other 0% · 1.9 KiB

~269.4 KiB of savings available

Remove unused JavaScript: 269.4 KiB
B
Image Optimization
34 images, 0 KB saveable
REVIEW
34 images, 0 KB saveable
Info::
All images are well-optimized
34 images 2.4 MB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
753ms total JS execution
REVIEW
753ms total JS execution
Info::
https://www.lboro.ac.uk/: 249ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KW3...: 142ms CPU time
Info::
https://code.jquery.com/jquery-3.5.1.min.js: 135ms CPU time
Info::
Unattributable: 89ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 79ms CPU time
Warning::
Third-party scripts: 753ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 25% Style & Layout 19% Script Parsing & Compilation 9% Rendering 7%
ScriptTotalScriptingParse/CompileParty
https://www.lboro.ac.uk/249ms3ms1ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9142ms102ms22ms3rd
https://code.jquery.com/jquery-3.5.1.min.js135ms74ms3ms3rd
Unattributable89ms2ms0ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js79ms65ms14ms3rd
https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.js60ms43ms14ms3rd
C
JS Bundles
Action
8 scripts, 269 KB unused
REVIEW
8 scripts, 269 KB unused
Warning::
https://customer.cludo.com/templates/3309/14555/di...: 79 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KW3...: 75 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 56 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.lboro.ac.uk/web-assets/prod/fountain/d...: 35 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://customer.cludo.com/scripts/bundles/search-...: 25 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 269 KB
269 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.js110 KB79 KB (72%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9181 KB75 KB (42%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB56 KB (45%)✓3rd
https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.js?v=2024121652 KB35 KB (69%)✓3rd
https://customer.cludo.com/scripts/bundles/search-script.min.js51 KB25 KB (50%)✓3rd
https://code.jquery.com/jquery-3.5.1.min.js31 KB—✓3rd
https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.js?v=2025112012 KB—✓3rd
https://analytics.silktide.com/a2965b81503399185a449e0e5ee29884.js16 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
2 fonts (150 KB)
PASS
2 fonts (150 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

150 KB total

Render-blocking

0

of 2

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 FCP 1.3 s LCP 1.8 shttps://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Regular-Variable.woff2NunitoSans-Regular-Vari... https://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Regular-Variable.woff2 — 74.6 KiB — 21 ms — font-display: swaphttps://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Italic-Variable.woff2NunitoSans-Italic-Varia... https://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Italic-Variable.woff2 — 75.8 KiB — 144 ms — font-display: swap
NunitoSans-Regular-Vari... woff2 swap
Size 75 KB
Load time 21 ms
Start 855 ms
Risk FOUT — text flashes from fallback to web font
NunitoSans-Italic-Varia... woff2 swap
Size 76 KB
Load time 144 ms
Start 1.7 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
HTTP Caching
max-age=86400 (1 day)
PASS
max-age=86400 (1 day)
Info::
Cache-Control header is set
Got: max-age=86400
Info::
Effective TTL: 1 day (max-age=86400)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=86400

DirectiveValueMeaning
max-age86400Cache for 1 day
Effective TTL: 86400 seconds
Network Waterfall
58 requests over 3090ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 1.8 shttps://lboro.ac.uk// https://lboro.ac.uk/ — 301 — 596 B — 663 ms — h2https://www.lboro.ac.uk/www.lboro.ac.uk/ https://www.lboro.ac.uk/ — 200 — 12.9 KiB — 181 ms — h2https://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Regular-Variable.woff2www.lboro.ac.uk/media/terminalfourr... https://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Regular-Variable.woff2 — 200 — 74.6 KiB — 21 ms — h2https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.css?v=20260120www.lboro.ac.uk/web-assets/prod/fou... https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.css?v=20260120 — 200 — 69.8 KiB — 20 ms — h2https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.css?v=20251120www.lboro.ac.uk/web-assets/prod/hom... https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.css?v=20251120 — 200 — 7.6 KiB — 15 ms — h2https://customer.cludo.com/templates/3309/14555/dist/styles/cludo-search-results.csscustomer.cludo.com/templates/3309/1... https://customer.cludo.com/templates/3309/14555/dist/styles/cludo-search-results.css — 200 — 3.3 KiB — 746 ms — h2https://code.jquery.com/jquery-3.5.1.min.jscode.jquery.com/jquery-3.5.1.min.js https://code.jquery.com/jquery-3.5.1.min.js — 200 — 30.5 KiB — 28 ms — h2https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.js?v=20241216www.lboro.ac.uk/web-assets/prod/fou... https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.js?v=20241216 — 200 — 52.1 KiB — 28 ms — h2https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.js?v=20251120www.lboro.ac.uk/web-assets/prod/hom... https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.js?v=20251120 — 200 — 12.0 KiB — 26 ms — h2https://customer.cludo.com/scripts/bundles/search-script.min.jscustomer.cludo.com/scripts/bundles/... https://customer.cludo.com/scripts/bundles/search-script.min.js — 200 — 51.3 KiB — 700 ms — h2https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.jscustomer.cludo.com/templates/3309/1... https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.js — 200 — 109.9 KiB — 329 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9 — 200 — 180.7 KiB — 29 ms — h2https://www.lboro.ac.uk/web-assets/prod/fountain/images/logos/lboro.svgwww.lboro.ac.uk/web-assets/prod/fou... https://www.lboro.ac.uk/web-assets/prod/fountain/images/logos/lboro.svg — 200 — 7.3 KiB — 7 ms — h2https://www.lboro.ac.uk/media/media/homepage/hero/qs-sport-2026-hero.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/hero/qs-sport-2026-hero.jpg — 200 — 99.7 KiB — 21 ms — h2https://www.lboro.ac.uk/media/media/homepage/promotional-panels/ug2027-homepage.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/promotional-panels/ug2027-homepage.jpg — 200 — 64.2 KiB — 32 ms — h2https://www.lboro.ac.uk/media/media/homepage/promotional-panels/pg-vod-homepage-card.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/promotional-panels/pg-vod-homepage-card.jpg — 200 — 68.1 KiB — 37 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/parasport-homepage-feature.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/parasport-homepage-feature.jpg — 200 — 85.7 KiB — 42 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/earth-data-16-9.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/earth-data-16-9.jpg — 200 — 80.5 KiB — 48 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/dan-parsons-960x540-D5865-21.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/dan-parsons-960x540-D5865-21.jpg — 200 — 97.8 KiB — 56 ms — h2https://www.lboro.ac.uk/media/media/volume/stories/medium/volume-homepage-empowering-the-planet-hydrogen-666x374px.jpgwww.lboro.ac.uk/media/media/volume/... https://www.lboro.ac.uk/media/media/volume/stories/medium/volume-homepage-empowering-the-planet-hydrogen-666x374px.jpg — 200 — 26.2 KiB — 59 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2024/benefits-of-artificial-intelligence-oct2024-960x540px-web.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2024/benefits-of-artificial-intelligence-oct2024-960x540px-web.jpg — 200 — 86.5 KiB — 65 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2024/creating-inclusive-communities-medium.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2024/creating-inclusive-communities-medium.jpg — 200 — 336.3 KiB — 94 ms — h2https://www.lboro.ac.uk/media/media/volume/stories/large/building-better-humans-medium.jpgwww.lboro.ac.uk/media/media/volume/... https://www.lboro.ac.uk/media/media/volume/stories/large/building-better-humans-medium.jpg — 200 — 84.8 KiB — 101 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2024/skye-homepage-960.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2024/skye-homepage-960.jpg — 200 — 164.3 KiB — 183 ms — h2data:image/svg+xml;charset%3DUS-ASCII,%3Csvg%20width%3D%2211%22%20height%3D%2216%22%20viewBox%3D%22…data:image/svg+xml;charset%3DUS-ASC... data:image/svg+xml;charset%3DUS-ASCII,%3Csvg%20width%3D%2211%22%20height%3D%2216%22%20viewBox%3D%22… — 200 — 0 B — 0 ms — datahttps://www.lboro.ac.uk/media/wwwlboroacuk/external/content/newsandevents/news/2025/dan-parsons-landscape-2026.jpgwww.lboro.ac.uk/media/wwwlboroacuk/... https://www.lboro.ac.uk/media/wwwlboroacuk/external/content/newsandevents/news/2025/dan-parsons-landscape-2026.jpg — 200 — 49.0 KiB — 112 ms — h2https://www.lboro.ac.uk/media/wwwlboroacuk/external/content/newsandevents/news/2025/image-head.jpgwww.lboro.ac.uk/media/wwwlboroacuk/... https://www.lboro.ac.uk/media/wwwlboroacuk/external/content/newsandevents/news/2025/image-head.jpg — 200 — 457.8 KiB — 221 ms — h2https://www.lboro.ac.uk/media/media/media-centre/images/press-releases/2026/socialtabs.jpgwww.lboro.ac.uk/media/media/media-c... https://www.lboro.ac.uk/media/media/media-centre/images/press-releases/2026/socialtabs.jpg — 200 — 58.8 KiB — 198 ms — h2https://www.lboro.ac.uk/media/media/media-centre/images/press-releases/2026/popeleo2.jpgwww.lboro.ac.uk/media/media/media-c... https://www.lboro.ac.uk/media/media/media-centre/images/press-releases/2026/popeleo2.jpg — 200 — 93.5 KiB — 198 ms — h2https://www.lboro.ac.uk/media/wwwlboroacuk/internal/content/images/news/main/d5895-070-library.jpgwww.lboro.ac.uk/media/wwwlboroacuk/... https://www.lboro.ac.uk/media/wwwlboroacuk/internal/content/images/news/main/d5895-070-library.jpg — 200 — 80.9 KiB — 198 ms — h2
0 ms 1.0 s 2.0 s 3.0 s FCP 1.3 s LCP 1.8 shttps://lboro.ac.uk// https://lboro.ac.uk/ — 301 — 596 B — 663 ms — h2https://www.lboro.ac.uk/www.lboro.ac.uk/ https://www.lboro.ac.uk/ — 200 — 12.9 KiB — 181 ms — h2https://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Regular-Variable.woff2www.lboro.ac.uk/media/terminalfourr... https://www.lboro.ac.uk/media/terminalfourrepository/fonts/NunitoSans-Regular-Variable.woff2 — 200 — 74.6 KiB — 21 ms — h2https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.css?v=20260120www.lboro.ac.uk/web-assets/prod/fou... https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.css?v=20260120 — 200 — 69.8 KiB — 20 ms — h2https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.css?v=20251120www.lboro.ac.uk/web-assets/prod/hom... https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.css?v=20251120 — 200 — 7.6 KiB — 15 ms — h2https://customer.cludo.com/templates/3309/14555/dist/styles/cludo-search-results.csscustomer.cludo.com/templates/3309/1... https://customer.cludo.com/templates/3309/14555/dist/styles/cludo-search-results.css — 200 — 3.3 KiB — 746 ms — h2https://code.jquery.com/jquery-3.5.1.min.jscode.jquery.com/jquery-3.5.1.min.js https://code.jquery.com/jquery-3.5.1.min.js — 200 — 30.5 KiB — 28 ms — h2https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.js?v=20241216www.lboro.ac.uk/web-assets/prod/fou... https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.js?v=20241216 — 200 — 52.1 KiB — 28 ms — h2https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.js?v=20251120www.lboro.ac.uk/web-assets/prod/hom... https://www.lboro.ac.uk/web-assets/prod/homepage/dist/homepage.js?v=20251120 — 200 — 12.0 KiB — 26 ms — h2https://customer.cludo.com/scripts/bundles/search-script.min.jscustomer.cludo.com/scripts/bundles/... https://customer.cludo.com/scripts/bundles/search-script.min.js — 200 — 51.3 KiB — 700 ms — h2https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.jscustomer.cludo.com/templates/3309/1... https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.js — 200 — 109.9 KiB — 329 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9 — 200 — 180.7 KiB — 29 ms — h2https://www.lboro.ac.uk/web-assets/prod/fountain/images/logos/lboro.svgwww.lboro.ac.uk/web-assets/prod/fou... https://www.lboro.ac.uk/web-assets/prod/fountain/images/logos/lboro.svg — 200 — 7.3 KiB — 7 ms — h2https://www.lboro.ac.uk/media/media/homepage/hero/qs-sport-2026-hero.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/hero/qs-sport-2026-hero.jpg — 200 — 99.7 KiB — 21 ms — h2https://www.lboro.ac.uk/media/media/homepage/promotional-panels/ug2027-homepage.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/promotional-panels/ug2027-homepage.jpg — 200 — 64.2 KiB — 32 ms — h2https://www.lboro.ac.uk/media/media/homepage/promotional-panels/pg-vod-homepage-card.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/promotional-panels/pg-vod-homepage-card.jpg — 200 — 68.1 KiB — 37 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/parasport-homepage-feature.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/parasport-homepage-feature.jpg — 200 — 85.7 KiB — 42 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/earth-data-16-9.jpgwww.lboro.ac.uk/media/media/homepag... https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/earth-data-16-9.jpg — 200 — 80.5 KiB — 48 ms — h2https://www.lboro.ac.uk/media/media/homepage/features-slides/2025/dan-parsons-960x540-D5865-21.jpgwww.lboro.ac.uk/media/media/homepag... 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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
100% of JavaScript execution is third-party
First-party Third-party 753ms · 457KB · £4/mo
www.lboro.ac.uk
Other
Costly
Execution 249ms
Transfer 13 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 142ms
Transfer 181 KB
Unused 42%
Monthly Cost £1/mo
code.jquery.com
Other
Optional
Execution 135ms
Transfer 31 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 89ms
Transfer 0 KB
Monthly Cost £0/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 79ms
Transfer 123 KB
Unused 45%
Monthly Cost £0/mo
customer.cludo.com
Other
Optional
Execution 60ms
Transfer 110 KB
Unused 72%
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • www.lboro.ac.uk adds 249ms and costs ~£1/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.lboro.ac.uk takes 249ms 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

72% of customer.cludo.com'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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