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https://southampton.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
91
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.
77
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.

570 ms

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

1.87 s

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

0 ms

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

0.021

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

1.34 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.

1.87 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
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
Page Weight Inventory
Action
44 resources · 1.9 MB · 288 KB savings available
FIX
44 resources · 1.9 MB · 288 KB savings available
Warning::
Page weight 883 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~288 KB of savings available
Warning::
43 third-party resources (100% of weight)
Info::
1 resources over 200KB
44 resources · 1.9 MiB · 43 third-party 882.8 KiB over 1MB target
JavaScript 35% · 671.4 KiB
Image 30% · 578.3 KiB
Font 28% · 528.3 KiB
CSS 3% · 60.0 KiB
Document 3% · 52.0 KiB
Other 1% · 16.7 KiB

~287.7 KiB of savings available

Remove unused JavaScript: 287.7 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, 44 requests
REVIEW
1.9 MB transferred, 44 requests
Info::
Page weighs 4.2 MB (1.9 MB transferred)
Warning::
JavaScript is 659 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 659 KB
Info::
Fonts are 528 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 528 KB
Info::
44 HTTP requests
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
44 requests
0.39 g CO2 per page load
JavaScript 658.7 KiB 35%
Fonts 528.3 KiB 28%
Images 463.3 KiB 24%
Other 114.3 KiB 6%
CSS 55.3 KiB 3%
HTML 52.0 KiB 3%
Other 32.6 KiB 2%
Other 2.3 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

B
JS Execution Cost
552ms total JS execution
REVIEW
552ms total JS execution
Info::
https://www.southampton.ac.uk/sites/default/files/...: 138ms CPU time
Info::
https://www.southampton.ac.uk/: 131ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-PMM...: 94ms CPU time
Info::
Unattributable: 79ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-879...: 61ms CPU time
Warning::
Third-party scripts: 552ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Style & Layout 23% Other 15% Script Parsing & Compilation 8% Parse HTML & CSS 6%
ScriptTotalScriptingParse/CompileParty
https://www.southampton.ac.uk/sites/default/files/js/js_shU6vvHqi9wSh7DMC2ghuuzHgu9KyxdqFZsq7SIHAig.js?scope=footer&delta=0&language=en&theme=drupal_endeavour&include=eJyFUW1uwyAMvRCEIyFDTMJKcGRD2u70IylRu3bS_ljvy0biwRfcbCIYkQ088VBmJueQlUvwfTfH7NgnEElRSuf7RocrpXuIKZ2UaYmCnTGEjq7oVuWYroJ8XDNTIgdJv2pq5LpCsphHhI0qmxBvdkUWylYQ2M82kK9_BPs1KfcU8_TpL8Som3X5tDJetcSCOsN2utREdBbGJeb2JC9ifMsK6hDbIutdO8NSvUeRUJMNtVRGMU9Jd0nhrezvm8fS0KmaiKaEtsBkpjbe-bA39Ftc1KODvZ52eKUscUO7YK7mjQ9nO_JvUmr75xBltjNtyDEXzEW10v3FHHPYS_8BNN_iRw138ms86ms11ms3rd
https://www.southampton.ac.uk/131ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Q94ms76ms15ms3rd
Unattributable79ms3ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h161ms54ms7ms3rd
https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.js50ms31ms11ms3rd
C
JS Bundles
Action
12 scripts, 288 KB unused
REVIEW
12 scripts, 288 KB unused
Warning::
https://www.southampton.ac.uk/sites/default/files/...: 96 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-879...: 65 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PMM...: 64 KB unused (30%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cookie-cdn.cookiepro.com/scripttemplates/2...: 62 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 288 KB
288 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.southampton.ac.uk/sites/default/files/js/js_shU6vvHqi9wSh7DMC2ghuuzHgu9KyxdqFZsq7SIHAig.js?scope=footer&delta=0&language=en&theme=drupal_endeavour&include=eJyFUW1uwyAMvRCEIyFDTMJKcGRD2u70IylRu3bS_ljvy0biwRfcbCIYkQ088VBmJueQlUvwfTfH7NgnEElRSuf7RocrpXuIKZ2UaYmCnTGEjq7oVuWYroJ8XDNTIgdJv2pq5LpCsphHhI0qmxBvdkUWylYQ2M82kK9_BPs1KfcU8_TpL8Som3X5tDJetcSCOsN2utREdBbGJeb2JC9ifMsK6hDbIutdO8NSvUeRUJMNtVRGMU9Jd0nhrezvm8fS0KmaiKaEtsBkpjbe-bA39Ftc1KODvZ52eKUscUO7YK7mjQ9nO_JvUmr75xBltjNtyDEXzEW10v3FHHPYS_8BNN_iRw166 KB96 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1145 KB65 KB (45%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Q212 KB64 KB (30%)✓3rd
https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.js112 KB62 KB (56%)✓3rd
https://www.southampton.ac.uk/sites/default/files/js/js_Bc5eL1qbz-kOb7b6T9YXvIZ_RQrSMJgR9HZjabP-xbk.js?scope=header&delta=0&language=en&theme=drupal_endeavour&include=eJyFUW1uwyAMvRCEIyFDTMJKcGRD2u70IylRu3bS_ljvy0biwRfcbCIYkQ088VBmJueQlUvwfTfH7NgnEElRSuf7RocrpXuIKZ2UaYmCnTGEjq7oVuWYroJ8XDNTIgdJv2pq5LpCsphHhI0qmxBvdkUWylYQ2M82kK9_BPs1KfcU8_TpL8Som3X5tDJetcSCOsN2utREdBbGJeb2JC9ifMsK6hDbIutdO8NSvUeRUJMNtVRGMU9Jd0nhrezvm8fS0KmaiKaEtsBkpjbe-bA39Ftc1KODvZ52eKUscUO7YK7mjQ9nO_JvUmr75xBltjNtyDEXzEW10v3FHHPYS_8BNN_iRw2 KB—✓3rd
https://www.southampton.ac.uk/modules/contrib/google_tag/js/gtag.js?tdtuep2 KB—✓3rd
https://www.southampton.ac.uk/modules/contrib/google_tag/js/gtm.js?tdtuep2 KB—✓3rd
https://www.southampton.ac.uk/libraries/lazysizes/plugins/blur-up/ls.blur-up.min.js3 KB—✓3rd
https://www.southampton.ac.uk/libraries/lazysizes/lazysizes.min.js5 KB—✓3rd
https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js9 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
Image Optimization
14 images, 0 KB saveable
PASS
14 images, 0 KB saveable
Info::
All images are well-optimized
14 images 463 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
Font Loading
7 fonts (528 KB)
PASS
7 fonts (528 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

528 KB total

Render-blocking

0

of 7

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 570 ms LCP 1.9 shttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-regular.woff2Inter-regular.woff2 https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-regular.woff2 — 116.0 KiB — 40 ms — font-display: swaphttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/src/fonts/font-icon/fonts/icomoon.ttf?etein3=icomoon.ttf https://www.southampton.ac.uk/themes/custom/drupal_endeavour/src/fonts/font-icon/fonts/icomoon.ttf?etein3= — 5.5 KiB — 39 ms — font-display: swaphttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-regular.woff2DMSerif-regular.woff2 https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-regular.woff2 — 25.8 KiB — 35 ms — font-display: swaphttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-bold.woff2Inter-bold.woff2 https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-bold.woff2 — 118.5 KiB — 40 ms — font-display: swaphttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-italic.woff2DMSerif-italic.woff2 https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-italic.woff2 — 25.7 KiB — 35 ms — font-display: swaphttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-semibold.woff2Inter-semibold.woff2 https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-semibold.woff2 — 118.5 KiB — 46 ms — font-display: swaphttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-medium.woff2Inter-medium.woff2 https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-medium.woff2 — 118.4 KiB — 48 ms — font-display: swap
Inter-regular.woff2 woff2 swap
Size 116 KB
Load time 40 ms
Start 463 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
icomoon.ttf ttf swap
Size 5 KB
Load time 39 ms
Start 463 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DMSerif-regular.woff2 woff2 swap
Size 26 KB
Load time 35 ms
Start 463 ms
Risk FOUT — text flashes from fallback to web font
Inter-bold.woff2 woff2 swap
Size 118 KB
Load time 40 ms
Start 464 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
DMSerif-italic.woff2 woff2 swap
Size 26 KB
Load time 35 ms
Start 465 ms
Risk FOUT — text flashes from fallback to web font
Inter-semibold.woff2 woff2 swap
Size 118 KB
Load time 46 ms
Start 465 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
Inter-medium.woff2 woff2 swap
Size 118 KB
Load time 48 ms
Start 466 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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)

Fixing the unchecked items could save ~237 KB and ~474 ms

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
44 requests over 1168ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 570 ms LCP 1.9 shttps://southampton.ac.uk// https://southampton.ac.uk/ — 301 — 134 B — 119 ms — http/1.0https://www.southampton.ac.uk/www.southampton.ac.uk/ https://www.southampton.ac.uk/ — 200 — 52.0 KiB — 208 ms — h2https://www.southampton.ac.uk/sites/default/files/css/css_ns8Wi_6K26M-aP7wbWWXvaG6Sf9hesP3D6R1Ifcz0lM.css?delta=0&language=en&theme=drupal_endeavour&include=eJyFkFuuwjAMRDeUNEuKnMRtc-s8ZCdAWf1tgaoIPvix7DMztmT4g5ulAgHZwNkPbebiHLJyBPfV7DTmSQXuFchiDgiX0tk4Kn7RHjh8axMVB6SlrfSWLRmv6CyEFLMdCycxfnML6jFuUdY7O8zSvUeRsZMde-uMYk6kX0jhrW0XFvMMDa9RVWCYGOosh3KSoefaHUWZMahtRy1Z4gVtwtzNxzw4Rlhqibn9tKa9_nQdLxGKfjEOBJWs0jA9-n_FK6Dywww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/css/css_ns8Wi_6K26M-aP7wbWWXvaG6Sf9hesP3D6R1Ifcz0lM.css?delta=0&language=en&theme=drupal_endeavour&include=eJyFkFuuwjAMRDeUNEuKnMRtc-s8ZCdAWf1tgaoIPvix7DMztmT4g5ulAgHZwNkPbebiHLJyBPfV7DTmSQXuFchiDgiX0tk4Kn7RHjh8axMVB6SlrfSWLRmv6CyEFLMdCycxfnML6jFuUdY7O8zSvUeRsZMde-uMYk6kX0jhrW0XFvMMDa9RVWCYGOosh3KSoefaHUWZMahtRy1Z4gVtwtzNxzw4Rlhqibn9tKa9_nQdLxGKfjEOBJWs0jA9-n_FK6Dy — 200 — 12.8 KiB — 33 ms — h2https://www.southampton.ac.uk/sites/default/files/css/css_MAi4DIjzj6xmFG61W_xi1k2T5ihmeL6h24PPgVTsE9Y.css?delta=1&language=en&theme=drupal_endeavour&include=eJyFkFuuwjAMRDeUNEuKnMRtc-s8ZCdAWf1tgaoIPvix7DMztmT4g5ulAgHZwNkPbebiHLJyBPfV7DTmSQXuFchiDgiX0tk4Kn7RHjh8axMVB6SlrfSWLRmv6CyEFLMdCycxfnML6jFuUdY7O8zSvUeRsZMde-uMYk6kX0jhrW0XFvMMDa9RVWCYGOosh3KSoefaHUWZMahtRy1Z4gVtwtzNxzw4Rlhqibn9tKa9_nQdLxGKfjEOBJWs0jA9-n_FK6Dywww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/css/css_MAi4DIjzj6xmFG61W_xi1k2T5ihmeL6h24PPgVTsE9Y.css?delta=1&language=en&theme=drupal_endeavour&include=eJyFkFuuwjAMRDeUNEuKnMRtc-s8ZCdAWf1tgaoIPvix7DMztmT4g5ulAgHZwNkPbebiHLJyBPfV7DTmSQXuFchiDgiX0tk4Kn7RHjh8axMVB6SlrfSWLRmv6CyEFLMdCycxfnML6jFuUdY7O8zSvUeRsZMde-uMYk6kX0jhrW0XFvMMDa9RVWCYGOosh3KSoefaHUWZMahtRy1Z4gVtwtzNxzw4Rlhqibn9tKa9_nQdLxGKfjEOBJWs0jA9-n_FK6Dy — 200 — 42.5 KiB — 47 ms — h2https://www.southampton.ac.uk/sites/default/files/js/js_Bc5eL1qbz-kOb7b6T9YXvIZ_RQrSMJgR9HZjabP-xbk.js?scope=header&delta=0&language=en&theme=drupal_endeavour&include=eJyFUW1uwyAMvRCEIyFDTMJKcGRD2u70IylRu3bS_ljvy0biwRfcbCIYkQ088VBmJueQlUvwfTfH7NgnEElRSuf7RocrpXuIKZ2UaYmCnTGEjq7oVuWYroJ8XDNTIgdJv2pq5LpCsphHhI0qmxBvdkUWylYQ2M82kK9_BPs1KfcU8_TpL8Som3X5tDJetcSCOsN2utREdBbGJeb2JC9ifMsK6hDbIutdO8NSvUeRUJMNtVRGMU9Jd0nhrezvm8fS0KmaiKaEtsBkpjbe-bA39Ftc1KODvZ52eKUscUO7YK7mjQ9nO_JvUmr75xBltjNtyDEXzEW10v3FHHPYS_8BNN_iRwwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/js/js_Bc5eL1qbz-kOb7b6T9YXvIZ_RQrSMJgR9HZjabP-xbk.js?scope=header&delta=0&language=en&theme=drupal_endeavour&include=eJyFUW1uwyAMvRCEIyFDTMJKcGRD2u70IylRu3bS_ljvy0biwRfcbCIYkQ088VBmJueQlUvwfTfH7NgnEElRSuf7RocrpXuIKZ2UaYmCnTGEjq7oVuWYroJ8XDNTIgdJv2pq5LpCsphHhI0qmxBvdkUWylYQ2M82kK9_BPs1KfcU8_TpL8Som3X5tDJetcSCOsN2utREdBbGJeb2JC9ifMsK6hDbIutdO8NSvUeRUJMNtVRGMU9Jd0nhrezvm8fS0KmaiKaEtsBkpjbe-bA39Ftc1KODvZ52eKUscUO7YK7mjQ9nO_JvUmr75xBltjNtyDEXzEW10v3FHHPYS_8BNN_iRw — 200 — 1.9 KiB — 47 ms — h2https://www.southampton.ac.uk/modules/contrib/google_tag/js/gtag.js?tdtuepwww.southampton.ac.uk/modules/contr... https://www.southampton.ac.uk/modules/contrib/google_tag/js/gtag.js?tdtuep — 200 — 2.1 KiB — 47 ms — h2https://www.southampton.ac.uk/modules/contrib/google_tag/js/gtm.js?tdtuepwww.southampton.ac.uk/modules/contr... https://www.southampton.ac.uk/modules/contrib/google_tag/js/gtm.js?tdtuep — 200 — 2.1 KiB — 47 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/images/logo/logo-uk.svgwww.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/images/logo/logo-uk.svg — 200 — 13.8 KiB — 47 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/two-students-collaborate-bloomberg-suite.jpg.jpg.webp?itok=yMi2mzgOwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/two-students-collaborate-bloomberg-suite.jpg.jpg.webp?itok=yMi2mzgO — 200 — 37.3 KiB — 69 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/data-centre-server-racks-blue%20glow-unsplash.jpg.webp?itok=P2kkR2urwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/data-centre-server-racks-blue%20glow-unsplash.jpg.webp?itok=P2kkR2ur — 200 — 110.3 KiB — 64 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/illustration-t-cells-attacking-cancer-cell%E2%80%A8.jpg.webp?itok=6itM4FhCwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/illustration-t-cells-attacking-cancer-cell%E2%80%A8.jpg.webp?itok=6itM4FhC — 200 — 62.6 KiB — 106 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/students-collaborate-modern-airy-learning-space-centenary-building.jpg.webp?itok=o8ncbIPlwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_extra_large/public/2026-03/students-collaborate-modern-airy-learning-space-centenary-building.jpg.webp?itok=o8ncbIPl — 200 — 47.1 KiB — 101 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 552ms · 687KB · £6/mo
www.southampton.ac.uk
Other
Optional
Execution 138ms
Transfer 166 KB
Unused 59%
Monthly Cost £1/mo
www.southampton.ac.uk
Other
Optional
Execution 131ms
Transfer 52 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 94ms
Transfer 212 KB
Unused 30%
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 79ms
Transfer 0 KB
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 61ms
Transfer 145 KB
Unused 45%
Monthly Cost £1/mo
cookie-cdn.cookiepro.com
Other
Optional
Execution 50ms
Transfer 112 KB
Unused 56%
Monthly Cost £1/mo

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

59% of www.southampton.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

56% of cookie-cdn.cookiepro.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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