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https://lboro.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
48
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.

3.48 s

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

6.06 s

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

800 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.

5.45 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.

9.97 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 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 56 requests
FIX
3.1 MB transferred, 56 requests
Warning::
Page weighs 5.0 MB (3.1 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::
56 HTTP requests
Info::
Estimated 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
56 requests
0.65 g CO2 per page load
Images 2.4 MiB 76%
JavaScript 576.2 KiB 18%
CSS 80.7 KiB 3%
Fonts 76.3 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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3318ms total JS execution
FIX
3318ms total JS execution
Warning::
https://www.lboro.ac.uk/: 954ms CPU time
Warning::
https://code.jquery.com/jquery-3.5.1.min.js: 682ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KW3...: 562ms CPU time
Warning::
Unattributable: 379ms CPU time
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 323ms CPU time
Warning::
Third-party scripts: 3318ms (100% of total)

Main Thread Breakdown

Script Evaluation 40% Other 24% Style & Layout 20% Script Parsing & Compilation 9% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.lboro.ac.uk/954ms15ms4ms3rd
https://code.jquery.com/jquery-3.5.1.min.js682ms375ms13ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KW3LH9562ms413ms88ms3rd
Unattributable379ms8ms0ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js323ms265ms57ms3rd
https://customer.cludo.com/templates/3309/14555/dist/js/cludo-search-results.js232ms167ms58ms3rd
https://www.lboro.ac.uk/web-assets/prod/fountain/dist/fountain.js?v=20241216133ms64ms24ms3rd
https://analytics.silktide.com/a2965b81503399185a449e0e5ee29884.js52ms39ms9ms3rd
D
Page Weight Inventory
Action
56 resources · 3.1 MB · 269 KB savings available
FIX
56 resources · 3.1 MB · 269 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~269 KB of savings available
Warning::
55 third-party resources (100% of weight)
Info::
2 resources over 200KB
56 resources · 3.1 MiB · 55 third-party 2.1 MiB over 1MB target
Image 76% · 2.4 MiB
JavaScript 18% · 576.2 KiB
CSS 3% · 80.7 KiB
Font 2% · 76.3 KiB
Document 0% · 13.5 KiB
Other 0% · 1.9 KiB

~269.3 KiB of savings available

Remove unused JavaScript: 269.3 KiB
B
Image Optimization
32 images, 0 KB saveable
REVIEW
32 images, 0 KB saveable
Info::
All images are well-optimized
32 images 2.4 MB
0 oversized -0 KB
26 legacy format
0 missing dimensions CLS risk
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
3 fonts (76 KB)
PASS
3 fonts (76 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

76 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.5 s LCP 6.1 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 — 29 ms — font-display: swaphttps://www.lboro.ac.uk/web-assets/prod/homepage/dist/fonts/slick.woffslick.woff https://www.lboro.ac.uk/web-assets/prod/homepage/dist/fonts/slick.woff — 834 B — 181 ms — font-display: swaphttps://www.lboro.ac.uk/web-assets/prod/homepage/dist/fonts/slick.ttfslick.ttf https://www.lboro.ac.uk/web-assets/prod/homepage/dist/fonts/slick.ttf — 838 B — 184 ms — font-display: swap
NunitoSans-Regular-Vari... woff2 swap
Size 75 KB
Load time 29 ms
Start 715 ms
Risk FOUT — text flashes from fallback to web font
slick.woff woff swap
Size 1 KB
Load time 181 ms
Start 1.9 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
slick.ttf ttf swap
Size 1 KB
Load time 184 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
—
preload
1
dns-prefetch
—
prefetch
—

1 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
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
56 requests over 2720ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.5 s LCP 6.1 shttps://lboro.ac.uk// https://lboro.ac.uk/ — 301 — 589 B — 670 ms — h2https://www.lboro.ac.uk/www.lboro.ac.uk/ https://www.lboro.ac.uk/ — 200 — 12.9 KiB — 26 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 — 29 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 — 24 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 — 20 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 — 732 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 — 23 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 — 33 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 — 11.9 KiB — 33 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 — 685 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 — 310 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 — 67 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 — 20 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 — 33 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 — 41 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 — 78 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 — 112 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 — 139 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 — 81 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 — 109 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 — 72 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 — 163 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 — 122 ms — h2https://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 — 205 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 — 458.0 KiB — 400 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 — 112 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 — 161 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 — 161 ms — h2https://www.lboro.ac.uk/media/wwwlboroacuk/external/content/newsandevents/events/specific/aids_dont_die_of_ignorance_monolith.jpgwww.lboro.ac.uk/media/wwwlboroacuk/... https://www.lboro.ac.uk/media/wwwlboroacuk/external/content/newsandevents/events/specific/aids_dont_die_of_ignorance_monolith.jpg — 200 — 52.8 KiB — 208 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 3.5 s LCP 6.1 shttps://lboro.ac.uk// https://lboro.ac.uk/ — 301 — 589 B — 670 ms — h2https://www.lboro.ac.uk/www.lboro.ac.uk/ https://www.lboro.ac.uk/ — 200 — 12.9 KiB — 26 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 — 29 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 — 24 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 — 20 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 — 732 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 — 23 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 — 33 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 — 11.9 KiB — 33 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 — 685 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 — 310 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 — 67 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 — 20 ms — h2https://www.lboro.ac.uk/media/media/homepage/promotional-panels/ug2027-homepage.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 3318ms · 526KB · £17/mo
www.lboro.ac.uk
Other
Costly
Execution 954ms
Transfer 13 KB
Monthly Cost £5/mo
code.jquery.com
Other
Costly
Execution 682ms
Transfer 31 KB
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 562ms
Transfer 181 KB
Unused 42%
Monthly Cost £3/mo
Unattributable
Other
Costly
Execution 379ms
Transfer 0 KB
Monthly Cost £2/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 323ms
Transfer 123 KB
Unused 45%
Monthly Cost £2/mo
customer.cludo.com
Other
Costly
Execution 232ms
Transfer 110 KB
Unused 72%
Monthly Cost £1/mo
www.lboro.ac.uk
Other
Optional
Execution 133ms
Transfer 52 KB
Unused 69%
Monthly Cost £1/mo
analytics.silktide.com
Other
Optional
Execution 52ms
Transfer 16 KB
Monthly Cost £0/mo

These scripts may cost more than they're worth

  • www.lboro.ac.uk adds 954ms and costs ~£5/month
  • code.jquery.com adds 682ms and costs ~£4/month
  • Google Tag Manager adds 562ms and costs ~£3/month
  • Unattributable adds 379ms and costs ~£2/month
  • cc.cdn.civiccomputing.com adds 323ms and costs ~£2/month
  • customer.cludo.com adds 232ms 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 954ms 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

code.jquery.com takes 682ms 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 562ms 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

Unattributable takes 379ms 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 323ms 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

customer.cludo.com takes 232ms 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

69% of www.lboro.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

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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