Skip to content
https://southampton.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
80
GRADE
B
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
41
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.

6.01 s

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

11.45 s

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

714 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.

7.21 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.

11.45 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
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 (1.6 MiB of 1.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2156ms total JS execution
FIX
2156ms total JS execution
Warning::
https://www.southampton.ac.uk/sites/default/files/...: 920ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PMM...: 393ms CPU time
Warning::
Unattributable: 294ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-879...: 262ms CPU time
Info::
https://cookie-cdn.cookiepro.com/scripttemplates/2...: 195ms CPU time
Warning::
Third-party scripts: 2156ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Style & Layout 22% 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_iRw920ms345ms53ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Q393ms315ms66ms3rd
Unattributable294ms10ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1h1262ms229ms30ms3rd
https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.js195ms129ms34ms3rd
https://www.southampton.ac.uk/91ms19ms1ms3rd
D
Page Weight Inventory
Action
40 resources · 1.6 MB · 288 KB savings available
FIX
40 resources · 1.6 MB · 288 KB savings available
Warning::
Page weight 573 KB over 1MB target
Got: 1.6 MB Expected: ≤ 1 MB
Info::
~288 KB of savings available
Warning::
39 third-party resources (100% of weight)
Info::
1 resources over 200KB
40 resources · 1.6 MiB · 39 third-party 573.0 KiB over 1MB target
JavaScript 42% · 671.5 KiB
Font 33% · 528.3 KiB
Image 17% · 268.5 KiB
CSS 4% · 60.0 KiB
Document 3% · 52.0 KiB
Other 1% · 16.8 KiB

~287.5 KiB of savings available

Remove unused JavaScript: 287.5 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
1.6 MB transferred, 40 requests
REVIEW
1.6 MB transferred, 40 requests
Info::
Page weighs 3.9 MB (1.6 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::
40 HTTP requests
Info::
Estimated 0.33 g CO2 per page load
1.6 MB / 2.4 MB budget
1.6 MB transferred
40 requests
0.33 g CO2 per page load
JavaScript 658.8 KiB 41%
Fonts 528.3 KiB 33%
Images 153.5 KiB 10%
Other 114.3 KiB 7%
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

C
JS Bundles
Action
12 scripts, 288 KB unused
REVIEW
12 scripts, 288 KB unused
Warning::
https://www.southampton.ac.uk/sites/default/files/...: 97 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 (44%)
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 KB97 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1h1145 KB65 KB (44%)✓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
10 images, 0 KB saveable
PASS
10 images, 0 KB saveable
Info::
All images are well-optimized
10 images 154 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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.0 s LCP 11.4 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/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 — 44 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 — 35 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 — 46 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 — 59 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 — 53 ms — font-display: swap
Inter-regular.woff2 woff2 swap
Size 116 KB
Load time 40 ms
Start 662 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-regular.woff2 woff2 swap
Size 26 KB
Load time 35 ms
Start 663 ms
Risk FOUT — text flashes from fallback to web font
Inter-bold.woff2 woff2 swap
Size 118 KB
Load time 44 ms
Start 663 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 35 ms
Start 663 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
DMSerif-italic.woff2 woff2 swap
Size 26 KB
Load time 46 ms
Start 663 ms
Risk FOUT — text flashes from fallback to web font
Inter-semibold.woff2 woff2 swap
Size 119 KB
Load time 59 ms
Start 663 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 53 ms
Start 663 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
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
40 requests over 1534ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.0 s LCP 11.4 shttps://southampton.ac.uk// https://southampton.ac.uk/ — 301 — 134 B — 125 ms — http/1.0https://www.southampton.ac.uk/www.southampton.ac.uk/ https://www.southampton.ac.uk/ — 200 — 52.0 KiB — 175 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 — 49 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 — 43 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 — 137 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 — 32 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 — 36 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 — 36 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/two-students-collaborate-bloomberg-suite.jpg.jpg.webp?itok=Tz_fCv1nwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/two-students-collaborate-bloomberg-suite.jpg.jpg.webp?itok=Tz_fCv1n — 200 — 12.2 KiB — 67 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/data-centre-server-racks-blue%20glow-unsplash.jpg.webp?itok=YO4jO5s8www.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/data-centre-server-racks-blue%20glow-unsplash.jpg.webp?itok=YO4jO5s8 — 200 — 31.1 KiB — 103 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/illustration-t-cells-attacking-cancer-cell%E2%80%A8.jpg.webp?itok=NvLskVlowww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/illustration-t-cells-attacking-cancer-cell%E2%80%A8.jpg.webp?itok=NvLskVlo — 200 — 20.7 KiB — 27 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/students-collaborate-modern-airy-learning-space-centenary-building.jpg.webp?itok=wmelcViRwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/students-collaborate-modern-airy-learning-space-centenary-building.jpg.webp?itok=wmelcViR — 200 — 17.0 KiB — 96 ms — h2https://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_iRwwww.southampton.ac.uk/sites/default... 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_iRw — 200 — 166.2 KiB — 116 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Q — 200 — 211.7 KiB — 193 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/icons/icons.svgwww.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/icons/icons.svg — 200 — 111.7 KiB — 29 ms — h2data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw== — 200 — 0 B — 0 ms — datahttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-regular.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-regular.woff2 — 200 — 116.0 KiB — 40 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-regular.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-regular.woff2 — 200 — 25.8 KiB — 35 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-bold.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-bold.woff2 — 200 — 118.5 KiB — 44 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/src/fonts/font-icon/fonts/icomoon.ttf?etein3=www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/src/fonts/font-icon/fonts/icomoon.ttf?etein3= — 200 — 5.5 KiB — 35 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-italic.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-italic.woff2 — 200 — 25.7 KiB — 46 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-semibold.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-semibold.woff2 — 200 — 118.5 KiB — 59 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-medium.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-medium.woff2 — 200 — 118.4 KiB — 53 ms — h2https://www.southampton.ac.uk/libraries/lazysizes/plugins/blur-up/ls.blur-up.min.jswww.southampton.ac.uk/libraries/laz... https://www.southampton.ac.uk/libraries/lazysizes/plugins/blur-up/ls.blur-up.min.js — 200 — 2.9 KiB — 26 ms — h2https://www.southampton.ac.uk/libraries/lazysizes/lazysizes.min.jswww.southampton.ac.uk/libraries/laz... https://www.southampton.ac.uk/libraries/lazysizes/lazysizes.min.js — 200 — 5.0 KiB — 26 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js — 200 — 9.3 KiB — 99 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1h1 — 200 — 145.4 KiB — 47 ms — h2https://cookie-cdn.cookiepro.com/consent/3fe7b5e2-5db6-444d-8441-0246422b1cba/3fe7b5e2-5db6-444d-8441-0246422b1cba.jsoncookie-cdn.cookiepro.com/consent/3f... https://cookie-cdn.cookiepro.com/consent/3fe7b5e2-5db6-444d-8441-0246422b1cba/3fe7b5e2-5db6-444d-8441-0246422b1cba.json — 200 — 2.3 KiB — 79 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/favicon.icowww.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/favicon.ico — 200 — 2.4 KiB — 68 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.js — 200 — 112.2 KiB — 50 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 6.0 s LCP 11.4 shttps://southampton.ac.uk// https://southampton.ac.uk/ — 301 — 134 B — 125 ms — http/1.0https://www.southampton.ac.uk/www.southampton.ac.uk/ https://www.southampton.ac.uk/ — 200 — 52.0 KiB — 175 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 — 49 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 — 43 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 — 137 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 — 32 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 — 36 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 — 36 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/two-students-collaborate-bloomberg-suite.jpg.jpg.webp?itok=Tz_fCv1nwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/two-students-collaborate-bloomberg-suite.jpg.jpg.webp?itok=Tz_fCv1n — 200 — 12.2 KiB — 67 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/data-centre-server-racks-blue%20glow-unsplash.jpg.webp?itok=YO4jO5s8www.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/data-centre-server-racks-blue%20glow-unsplash.jpg.webp?itok=YO4jO5s8 — 200 — 31.1 KiB — 103 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/illustration-t-cells-attacking-cancer-cell%E2%80%A8.jpg.webp?itok=NvLskVlowww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/illustration-t-cells-attacking-cancer-cell%E2%80%A8.jpg.webp?itok=NvLskVlo — 200 — 20.7 KiB — 27 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/students-collaborate-modern-airy-learning-space-centenary-building.jpg.webp?itok=wmelcViRwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/banner_medium/public/2026-03/students-collaborate-modern-airy-learning-space-centenary-building.jpg.webp?itok=wmelcViR — 200 — 17.0 KiB — 96 ms — h2https://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_iRwwww.southampton.ac.uk/sites/default... 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_iRw — 200 — 166.2 KiB — 116 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Qwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PMMZ8Q — 200 — 211.7 KiB — 193 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/icons/icons.svgwww.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/icons/icons.svg — 200 — 111.7 KiB — 29 ms — h2data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw== — 200 — 0 B — 0 ms — datahttps://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-regular.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-regular.woff2 — 200 — 116.0 KiB — 40 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-regular.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-regular.woff2 — 200 — 25.8 KiB — 35 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-bold.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-bold.woff2 — 200 — 118.5 KiB — 44 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/src/fonts/font-icon/fonts/icomoon.ttf?etein3=www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/src/fonts/font-icon/fonts/icomoon.ttf?etein3= — 200 — 5.5 KiB — 35 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-italic.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/DMSerif-italic.woff2 — 200 — 25.7 KiB — 46 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-semibold.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-semibold.woff2 — 200 — 118.5 KiB — 59 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-medium.woff2www.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/dist/fonts/Inter-medium.woff2 — 200 — 118.4 KiB — 53 ms — h2https://www.southampton.ac.uk/libraries/lazysizes/plugins/blur-up/ls.blur-up.min.jswww.southampton.ac.uk/libraries/laz... https://www.southampton.ac.uk/libraries/lazysizes/plugins/blur-up/ls.blur-up.min.js — 200 — 2.9 KiB — 26 ms — h2https://www.southampton.ac.uk/libraries/lazysizes/lazysizes.min.jswww.southampton.ac.uk/libraries/laz... https://www.southampton.ac.uk/libraries/lazysizes/lazysizes.min.js — 200 — 5.0 KiB — 26 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js — 200 — 9.3 KiB — 99 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-879238842&cx=c&gtm=4e64h1h1 — 200 — 145.4 KiB — 47 ms — h2https://cookie-cdn.cookiepro.com/consent/3fe7b5e2-5db6-444d-8441-0246422b1cba/3fe7b5e2-5db6-444d-8441-0246422b1cba.jsoncookie-cdn.cookiepro.com/consent/3f... https://cookie-cdn.cookiepro.com/consent/3fe7b5e2-5db6-444d-8441-0246422b1cba/3fe7b5e2-5db6-444d-8441-0246422b1cba.json — 200 — 2.3 KiB — 79 ms — h2https://www.southampton.ac.uk/themes/custom/drupal_endeavour/favicon.icowww.southampton.ac.uk/themes/custom... https://www.southampton.ac.uk/themes/custom/drupal_endeavour/favicon.ico — 200 — 2.4 KiB — 68 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.jscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/otBannerSdk.js — 200 — 112.2 KiB — 50 ms — h2https://cookie-cdn.cookiepro.com/consent/3fe7b5e2-5db6-444d-8441-0246422b1cba/d05b86d1-d618-4a12-83ec-c9ca9e65369f/en.jsoncookie-cdn.cookiepro.com/consent/3f... https://cookie-cdn.cookiepro.com/consent/3fe7b5e2-5db6-444d-8441-0246422b1cba/d05b86d1-d618-4a12-83ec-c9ca9e65369f/en.json — 200 — 10.4 KiB — 41 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/assets/otFlat.jsoncookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/assets/otFlat.json — 200 — 3.4 KiB — 33 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/assets/v2/otPcPanel.jsoncookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/assets/v2/otPcPanel.json — 200 — 13.2 KiB — 34 ms — h2https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/assets/otCommonStyles.csscookie-cdn.cookiepro.com/scripttemp... https://cookie-cdn.cookiepro.com/scripttemplates/202411.1.0/assets/otCommonStyles.css — 200 — 4.7 KiB — 31 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=10&frm=0&en=page_view&dl=https%3A%2F%2Fwww.southampton.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=446804046.1776816210&navt=n&npa=1&gdid=dMDhkMT.dYWJhMj&gtm=45be64h1h1v9177238164z871322501za20gzb71322501zd71322501xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938469~117266400&apve=1&apvf=f&apvc=1&tids=AW-879238842&tid=AW-879238842&tft=1776816210307&tfd=1172pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=10&frm=0&en=page_view&dl=https%3A%2F%2Fwww.southampton.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=446804046.1776816210&navt=n&npa=1&gdid=dMDhkMT.dYWJhMj&gtm=45be64h1h1v9177238164z871322501za20gzb71322501zd71322501xec&gcs=G100&gcd=13q3q3q2q5l1&dma_cps=-&dma=1&tag_exp=0~115616985~115938466~115938469~117266400&apve=1&apvf=f&apvc=1&tids=AW-879238842&tid=AW-879238842&tft=1776816210307&tfd=1172 — 200 — 21 B — 94 ms — h3https://cookie-cdn.cookiepro.com/logos/static/ot_guard_logo.svgcookie-cdn.cookiepro.com/logos/stat... https://cookie-cdn.cookiepro.com/logos/static/ot_guard_logo.svg — 200 — 864 B — 30 ms — h2https://cookie-cdn.cookiepro.com/logos/205e2739-01ea-492a-a7fd-6ee0c56dfbb9/36260f1b-6154-4f5c-884c-3502c1f0fe30/b13ffdc6-d6d1-4c65-9e16-45a5cc23fd5b/University_logo_marine1_transparent.pngcookie-cdn.cookiepro.com/logos/205e... https://cookie-cdn.cookiepro.com/logos/205e2739-01ea-492a-a7fd-6ee0c56dfbb9/36260f1b-6154-4f5c-884c-3502c1f0fe30/b13ffdc6-d6d1-4c65-9e16-45a5cc23fd5b/University_logo_marine1_transparent.png — 200 — 10.9 KiB — 34 ms — h2https://cookie-cdn.cookiepro.com/logos/static/poweredBy_cp_logo.svgcookie-cdn.cookiepro.com/logos/stat... https://cookie-cdn.cookiepro.com/logos/static/poweredBy_cp_logo.svg — 200 — 2.8 KiB — 33 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/card_300xstandard_16_9/public/2026-03/engineering-researcher-giant-metallic-structure-experiment.jpg.webp?itok=C8soZchHwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/card_300xstandard_16_9/public/2026-03/engineering-researcher-giant-metallic-structure-experiment.jpg.webp?itok=C8soZchH — 200 — 20.0 KiB — 89 ms — h2https://www.southampton.ac.uk/sites/default/files/styles/card_300xstandard_16_9/public/2024-10/Open%20Day%20tour%20guide.jpg.webp?itok=g-4TFLkFwww.southampton.ac.uk/sites/default... https://www.southampton.ac.uk/sites/default/files/styles/card_300xstandard_16_9/public/2024-10/Open%20Day%20tour%20guide.jpg.webp?itok=g-4TFLkF — 200 — 24.9 KiB — 96 ms — h2
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 2156ms · 687KB · £22/mo
www.southampton.ac.uk
Other
Costly
Execution 920ms
Transfer 166 KB
Unused 59%
Monthly Cost £10/mo
Google Tag Manager
Tag Manager
Costly
Execution 393ms
Transfer 212 KB
Unused 30%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 294ms
Transfer 0 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 262ms
Transfer 145 KB
Unused 44%
Monthly Cost £3/mo
cookie-cdn.cookiepro.com
Other
Optional
Execution 195ms
Transfer 112 KB
Unused 56%
Monthly Cost £2/mo
www.southampton.ac.uk
Other
Optional
Execution 91ms
Transfer 52 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.southampton.ac.uk adds 920ms and costs ~£10/month
  • Google Tag Manager adds 393ms and costs ~£4/month
  • Unattributable adds 294ms and costs ~£3/month
  • Google Tag Manager adds 262ms and costs ~£3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

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

Source: web.dev

www.southampton.ac.uk takes 920ms 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

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

Google Tag Manager takes 393ms 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 294ms 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 262ms 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

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.

Send Feedback