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https://bath.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
52
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

6.35 s

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

17.20 s

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

232 ms

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

0.068

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

8.17 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.

21.05 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
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.1 MB transferred, 124 requests
FIX
6.1 MB transferred, 124 requests
Critical::
Page weighs 11.8 MB (6.1 MB transferred)
Warning::
Images are 3.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.6 MB
Warning::
JavaScript is 824 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 824 KB
Warning::
124 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.3 g CO2 per page load
6.1 MB / 2.4 MB budget
6.1 MB transferred
124 requests
1.3 g CO2 per page load
Images 3.6 MiB 60%
Other 1.1 MiB 18%
JavaScript 824.1 KiB 13%
HTML 428.9 KiB 7%
CSS 68.8 KiB 1%
Other 38.5 KiB 1%
Fonts 35.0 KiB 1%
Other 5.0 KiB 0%
Other 1.1 KiB 0%
Other 142 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

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 (6.1 MiB of 6.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2402ms total JS execution
FIX
2402ms total JS execution
Warning::
Unattributable: 759ms CPU time
Warning::
https://www.bath.ac.uk/: 464ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NN6...: 449ms CPU time
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 307ms CPU time
Info::
https://code.jquery.com/jquery-3.7.1.min.js: 156ms CPU time
Warning::
Third-party scripts: 2402ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 36% Style & Layout 15% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable759ms13ms0ms3rd
https://www.bath.ac.uk/464ms30ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NN6ZCP449ms340ms60ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js307ms234ms53ms3rd
https://code.jquery.com/jquery-3.7.1.min.js156ms92ms6ms3rd
https://cdnjs.cloudflare.com/ajax/libs/material-components-web/5.1.0/material-components-web.min.js123ms52ms25ms3rd
https://cdnjs.cloudflare.com/ajax/libs/foundation/6.8.1/js/foundation.min.js87ms45ms39ms3rd
https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/awards-footer.js58ms31ms1ms3rd
D
Page Weight Inventory
Action
124 resources · 6.1 MB · 177 KB savings available
FIX
124 resources · 6.1 MB · 177 KB savings available
Warning::
Page weight 5.1 MB over 1MB target
Got: 6.1 MB Expected: ≤ 1 MB
Info::
~177 KB of savings available
Warning::
123 third-party resources (100% of weight)
Info::
16 resources over 200KB
124 resources · 6.1 MiB · 123 third-party 5.1 MiB over 1MB target
Image 60% · 3.7 MiB
Other 18% · 1.1 MiB
JavaScript 13% · 824.1 KiB
Document 7% · 429.2 KiB
CSS 1% · 68.8 KiB
Font 1% · 35.0 KiB

~177.2 KiB of savings available

Remove unused JavaScript: 177.2 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
Image Optimization
Action
48 images, 0 KB saveable
REVIEW
48 images, 0 KB saveable
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.bath.ac.uk/lens/125/assets/university-... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
48 images 3.5 MB
0 oversized -0 KB
43 legacy format
10 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
40 scripts, 177 KB unused
REVIEW
40 scripts, 177 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NN6...: 77 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 55 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/material-co...: 23 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/foundation/...: 22 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 177 KB
177 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-NN6ZCP210 KB77 KB (37%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB55 KB (45%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/material-components-web/5.1.0/material-components-web.min.js38 KB23 KB (61%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/foundation/6.8.1/js/foundation.min.js33 KB22 KB (67%)✓3rd
https://f.vimeocdn.com/p/4.46.43/js/player.module.js0 KB—✓3rd
https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/hero-parallax.js1 KB—✓3rd
https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/sticky-nav.js2 KB—✓3rd
https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/hammer.min.js8 KB—✓3rd
https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.hammer.js1 KB—✓3rd
https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.waypoints.min.js3 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

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
1 fonts (35 KB)
PASS
1 fonts (35 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

35 KB total

Render-blocking

0

of 1

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 14.0 s 16.0 s 18.0 s FCP 6.4 s LCP 17.2 shttps://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2o-0bIpQlx3QUlC5A4PNB6Ry... https://fonts.gstatic.com/s/notosans/v42/o-0bIpQlx3QUlC5A4PNB6Ryti20_6n1iPHjc5a7du3mhPy0.woff2 — 35.0 KiB — 37 ms — font-display: swap
o-0bIpQlx3QUlC5A4PNB6Ry... woff2 swap
Size 35 KB
Load time 37 ms
Start 496 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
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
Network Waterfall
124 requests over 4200ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 6.4 s LCP 17.2 shttps://bath.ac.uk// https://bath.ac.uk/ — 301 — 244 B — 139 ms — http/1.1https://www.bath.ac.uk/www.bath.ac.uk/ https://www.bath.ac.uk/ — 200 — 10.3 KiB — 140 ms — http/1.1https://fonts.googleapis.com/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,latin-extfonts.googleapis.com/css?family=Not... https://fonts.googleapis.com/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,latin-ext — 200 — 1.4 KiB — 99 ms — h2https://www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.csswww.bath.ac.uk/lens/125/css/univers... https://www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.css — 200 — 42.5 KiB — 105 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/qs-world-top-150-2026.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/qs-world-top-150-2026.svg — 200 — 6.7 KiB — 143 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/top-10-4-leauge-tables-2026.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/top-10-4-leauge-tables-2026.svg — 200 — 6.4 KiB — 118 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/daily-mail-guardian-career-jobs-2026.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/daily-mail-guardian-career-jobs-2026.svg — 200 — 8.2 KiB — 143 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/sport-uni-of-the-year-times-2026.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/sport-uni-of-the-year-times-2026.svg — 200 — 431.0 KiB — 407 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/TEF-triple-gold-2023.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/TEF-triple-gold-2023.svg — 200 — 28.7 KiB — 231 ms — http/1.1https://code.jquery.com/jquery-3.7.1.min.jscode.jquery.com/jquery-3.7.1.min.js https://code.jquery.com/jquery-3.7.1.min.js — 200 — 30.0 KiB — 35 ms — h2https://cdnjs.cloudflare.com/ajax/libs/foundation/6.8.1/js/foundation.min.jscdnjs.cloudflare.com/ajax/libs/foun... https://cdnjs.cloudflare.com/ajax/libs/foundation/6.8.1/js/foundation.min.js — 200 — 32.6 KiB — 101 ms — h2https://cdnjs.cloudflare.com/ajax/libs/material-components-web/5.1.0/material-components-web.min.jscdnjs.cloudflare.com/ajax/libs/mate... https://cdnjs.cloudflare.com/ajax/libs/material-components-web/5.1.0/material-components-web.min.js — 200 — 38.1 KiB — 112 ms — h2https://live.staticflickr.com/65535/55176118597_0b8777cfde_o.jpglive.staticflickr.com/65535/5517611... https://live.staticflickr.com/65535/55176118597_0b8777cfde_o.jpg — 200 — 195.3 KiB — 49 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-NN6ZCPwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-NN6ZCP — 200 — 209.5 KiB — 170 ms — h2https://player.vimeo.com/video/1120044456?badge=0&autopause=0&player_id=0&app_id=58479player.vimeo.com/video/1120044456?b... https://player.vimeo.com/video/1120044456?badge=0&autopause=0&player_id=0&app_id=58479 — 200 — 11.2 KiB — 291 ms — http/1.1https://player.vimeo.com/video/1120037369?badge=0&autopause=0&player_id=0&app_id=58479player.vimeo.com/video/1120037369?b... https://player.vimeo.com/video/1120037369?badge=0&autopause=0&player_id=0&app_id=58479 — 200 — 11.2 KiB — 324 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/school-of-management/js/infographics.jswww.bath.ac.uk/lens/125/assets/scho... https://www.bath.ac.uk/lens/125/assets/school-of-management/js/infographics.js — 200 — 3.1 KiB — 67 ms — http/1.1https://fonts.googleapis.com/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,latin-ext&display=swapfonts.googleapis.com/css?family=Not... https://fonts.googleapis.com/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,latin-ext&display=swap — 200 — 1.0 KiB — 30 ms — h2https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/hero-parallax.jswww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/components/hero-parallax.js — 200 — 936 B — 52 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/sticky-nav.jswww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/sticky-nav.js — 200 — 1.6 KiB — 50 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/hammer.min.jswww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/hammer.min.js — 200 — 7.6 KiB — 58 ms — http/1.1https://live.staticflickr.com/65535/55176118597_0b8777cfde_o.jpglive.staticflickr.com/65535/5517611... https://live.staticflickr.com/65535/55176118597_0b8777cfde_o.jpg — 200 — 0 B — 3 ms — h2https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.hammer.jswww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.hammer.js — 200 — 833 B — 53 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.waypoints.min.jswww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/js/vendor/jquery.waypoints.min.js — 200 — 3.1 KiB — 65 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/icons/tab-left-arrow.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/icons/tab-left-arrow.svg — 200 — 885 B — 48 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/logo/uob-logo-wordmark-inverse.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/logo/uob-logo-wordmark-inverse.svg — 200 — 3.0 KiB — 83 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/icons/global-spyglass-inverse.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/icons/global-spyglass-inverse.svg — 200 — 608 B — 82 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/icons/global-nav-inverse.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/icons/global-nav-inverse.svg — 200 — 526 B — 103 ms — 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0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s FCP 6.4 s LCP 17.2 shttps://bath.ac.uk// https://bath.ac.uk/ — 301 — 244 B — 139 ms — http/1.1https://www.bath.ac.uk/www.bath.ac.uk/ https://www.bath.ac.uk/ — 200 — 10.3 KiB — 140 ms — http/1.1https://fonts.googleapis.com/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,latin-extfonts.googleapis.com/css?family=Not... https://fonts.googleapis.com/css?family=Noto+Sans:400,400i,700,700i&subset=cyrillic,latin-ext — 200 — 1.4 KiB — 99 ms — h2https://www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.csswww.bath.ac.uk/lens/125/css/univers... https://www.bath.ac.uk/lens/125/css/university-of-bath/university-of-bath.css — 200 — 42.5 KiB — 105 ms — http/1.1https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/qs-world-top-150-2026.svgwww.bath.ac.uk/lens/125/assets/univ... https://www.bath.ac.uk/lens/125/assets/university-of-bath/images/awards/qs-world-top-150-2026.svg — 200 — 6.7 KiB — 143 ms 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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 2402ms · 447KB · £25/mo
Unattributable
Other
Costly
Execution 759ms
Transfer 0 KB
Monthly Cost £8/mo
www.bath.ac.uk
Other
Costly
Execution 464ms
Transfer 10 KB
Monthly Cost £5/mo
Google Tag Manager
Tag Manager
Costly
Execution 449ms
Transfer 210 KB
Unused 37%
Monthly Cost £5/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 307ms
Transfer 123 KB
Unused 45%
Monthly Cost £3/mo
code.jquery.com
Other
Optional
Execution 156ms
Transfer 30 KB
Monthly Cost £2/mo
cdnjs
CDN
Optional
Execution 123ms
Transfer 38 KB
Unused 61%
Monthly Cost £1/mo
cdnjs
CDN
Optional
Execution 87ms
Transfer 33 KB
Unused 67%
Monthly Cost £1/mo
www.bath.ac.uk
Other
Optional
Execution 58ms
Transfer 3 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 759ms and costs ~£8/month
  • www.bath.ac.uk adds 464ms and costs ~£5/month
  • Google Tag Manager adds 449ms and costs ~£5/month
  • cc.cdn.civiccomputing.com adds 307ms 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.

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Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

Unattributable takes 759ms 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.bath.ac.uk takes 464ms 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 449ms 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 307ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

61% of cdnjs'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

67% of cdnjs'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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