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https://exeter.ac.uk

Performance

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

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

Mobile Desktop
95
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.
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.

923 ms

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

1.21 s

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

3 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.

1.30 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.

1.80 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 3 REVIEW 4 FIX
F
Page Weight Budget
Action
3.1 MB transferred, 77 requests
FIX
3.1 MB transferred, 77 requests
Warning::
Page weighs 5.6 MB (3.1 MB transferred)
Warning::
Images are 1.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.9 MB
Warning::
JavaScript is 847 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 847 KB
Info::
Fonts are 221 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 221 KB
Info::
77 HTTP requests
Info::
Estimated 0.66 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
77 requests
0.66 g CO2 per page load
Images 1.9 MiB 62%
JavaScript 847.4 KiB 26%
Fonts 220.9 KiB 7%
Other 65.5 KiB 2%
CSS 42.1 KiB 1%
HTML 16.9 KiB 1%
Other 15.5 KiB 0%
Other 4.0 KiB 0%
Other 325 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

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

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 Bundles
Action
22 scripts, 304 KB unused
FIX
22 scripts, 304 KB unused
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 70 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-D45K...: 67 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S2L9...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K4N...: 64 KB unused (31%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://try.abtasty.com/25815a6dd8d07c10e8a6399806...: 38 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 304 KB
304 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js129 KB70 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-D45K1N753J&cx=c&gtm=4e64h1169 KB67 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S2L9JPLZ1E&cx=c&gtm=4e64h1157 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K4NS9FB207 KB64 KB (31%)✓3rd
https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922/main.259ac94de0fe3b10fc58.js64 KB38 KB (59%)✓3rd
https://extend.vimeocdn.com/ga4/203557565.js12 KB—✓3rd
https://www.exeter.ac.uk/v8media/global/js/lite-yt-embed.js3 KB—✓3rd
https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922/initiator.js4 KB—✓3rd
https://try.abtasty.com/shared/commons.32b0810ba1fc402d09de.js4 KB—✓3rd
https://app-script.monsido.com/v2/monsido-script.js4 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

D
Page Weight Inventory
Action
77 resources · 3.1 MB · 304 KB savings available
FIX
77 resources · 3.1 MB · 304 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~304 KB of savings available
Warning::
76 third-party resources (100% of weight)
Info::
4 resources over 200KB
77 resources · 3.1 MiB · 76 third-party 2.1 MiB over 1MB target
Image 63% · 2.0 MiB
JavaScript 28% · 883.8 KiB
Font 7% · 220.9 KiB
CSS 1% · 46.8 KiB
Other 1% · 27.9 KiB
Document 1% · 17.5 KiB

~303.6 KiB of savings available

Remove unused JavaScript: 303.6 KiB
C
Image Optimization
Action
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://news.exeter.ac.uk/wp-content/uploads/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://news.exeter.ac.uk/wp-content/uploads/2023/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://news.exeter.ac.uk/wp-content/uploads/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://news.exeter.ac.uk/wp-content/uploads/2026/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.exeter.ac.uk/v8media/recruitmentsites/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 1.9 MB
0 oversized -0 KB
14 legacy format
17 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

Performance issues directly impact user engagement and conversion rates.

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

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

B
JS Execution Cost
547ms total JS execution
REVIEW
547ms total JS execution
Info::
Unattributable: 160ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-K4N...: 101ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-D45K...: 80ms CPU time
Info::
https://www.exeter.ac.uk/: 79ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 67ms CPU time
Warning::
Third-party scripts: 547ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Other 20% Script Parsing & Compilation 9% Style & Layout 7%
ScriptTotalScriptingParse/CompileParty
Unattributable160ms40ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K4NS9FB101ms78ms17ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D45K1N753J&cx=c&gtm=4e64h180ms70ms10ms3rd
https://www.exeter.ac.uk/79ms5ms1ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js67ms48ms11ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js60ms51ms2ms3rd
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
6 fonts (221 KB)
PASS
6 fonts (221 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

221 KB total

Render-blocking

0

of 6

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 923 ms LCP 1.2 shttps://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-regular.woff2outfit-v11-latin_latin-... https://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-regular.woff2 — 17.8 KiB — 21 ms — font-display: swaphttps://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-700.woff2outfit-v11-latin_latin-... https://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-700.woff2 — 18.0 KiB — 18 ms — font-display: swaphttps://www.exeter.ac.uk/v8media/global/css/fonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.exeter.ac.uk/v8media/global/css/fonts/fa-brands-400.woff2 — 75.8 KiB — 26 ms — font-display: swaphttps://www.exeter.ac.uk/v8media/global/css/fonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.exeter.ac.uk/v8media/global/css/fonts/fa-regular-400.woff2 — 13.7 KiB — 23 ms — font-display: swaphttps://www.exeter.ac.uk/v8media/global/css/fonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.exeter.ac.uk/v8media/global/css/fonts/fa-solid-900.woff2 — 77.3 KiB — 37 ms — font-display: swaphttps://www.exeter.ac.uk/v8media/global/css/fonts/glyphicons-halflings-regular.woff2glyphicons-halflings-re... https://www.exeter.ac.uk/v8media/global/css/fonts/glyphicons-halflings-regular.woff2 — 18.4 KiB — 34 ms — font-display: swap
outfit-v11-latin_latin-... woff2 swap
Size 18 KB
Load time 21 ms
Start 130 ms
Risk FOUT — text flashes from fallback to web font
outfit-v11-latin_latin-... woff2 swap
Size 18 KB
Load time 18 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 26 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 14 KB
Load time 23 ms
Start 131 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 37 ms
Start 132 ms
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 34 ms
Start 227 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
HTTP Caching
max-age=43200 (12 hours)
PASS
max-age=43200 (12 hours)
Info::
Cache-Control header is set
Got: max-age=43200
Info::
Effective TTL: 12 hours (max-age=43200)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=43200

DirectiveValueMeaning
max-age43200Cache for 12 hours
Effective TTL: 43200 seconds
Network Waterfall
77 requests over 1983ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 923 ms LCP 1.2 shttps://exeter.ac.uk// https://exeter.ac.uk/ — 301 — 551 B — 109 ms — h2https://www.exeter.ac.uk/www.exeter.ac.uk/ https://www.exeter.ac.uk/ — 200 — 16.9 KiB — 13 ms — h2https://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-regular.woff2www.exeter.ac.uk/v8media/global/css... https://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-regular.woff2 — 200 — 17.8 KiB — 21 ms — h2https://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-700.woff2www.exeter.ac.uk/v8media/global/css... https://www.exeter.ac.uk/v8media/global/css/fonts/outfit-v11-latin_latin-ext-700.woff2 — 200 — 18.0 KiB — 18 ms — h2https://www.exeter.ac.uk/v8media/global/css/fonts/fa-brands-400.woff2www.exeter.ac.uk/v8media/global/css... https://www.exeter.ac.uk/v8media/global/css/fonts/fa-brands-400.woff2 — 200 — 75.8 KiB — 26 ms — h2https://www.exeter.ac.uk/v8media/global/css/fonts/fa-regular-400.woff2www.exeter.ac.uk/v8media/global/css... https://www.exeter.ac.uk/v8media/global/css/fonts/fa-regular-400.woff2 — 200 — 13.7 KiB — 23 ms — h2https://www.exeter.ac.uk/v8media/global/css/fonts/fa-solid-900.woff2www.exeter.ac.uk/v8media/global/css... https://www.exeter.ac.uk/v8media/global/css/fonts/fa-solid-900.woff2 — 200 — 77.3 KiB — 37 ms — h2https://www.exeter.ac.uk/v8media/global/css/global-stylesheet-v1.2.2.csswww.exeter.ac.uk/v8media/global/css... https://www.exeter.ac.uk/v8media/global/css/global-stylesheet-v1.2.2.css — 200 — 42.1 KiB — 27 ms — h2https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922.jstry.abtasty.com/25815a6dd8d07c10e8a... https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922.js — 200 — 2.4 KiB — 14 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/uoe-logo.svgwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/uoe-logo.svg — 200 — 8.2 KiB — 23 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/32478-1440x400.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/32478-1440x400.webp — 200 — 57.9 KiB — 24 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/MOU-signing-1920x514.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/MOU-signing-1920x514.webp — 200 — 30.7 KiB — 26 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/homepage-banner-SOMO2.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/homepage-banner-SOMO2.webp — 200 — 31.8 KiB — 27 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/homepage-banner-Woman-in-science.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/homepage-banner-Woman-in-science.webp — 200 — 20.5 KiB — 32 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/homepage-banner-QS-ranking.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/homepage-banner-QS-ranking.webp — 200 — 21.5 KiB — 27 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/TEF-2023-banner.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/TEF-2023-banner.webp — 200 — 40.3 KiB — 34 ms — h2https://www.exeter.ac.uk/v8media/global/js/jquery-2.2.4.min.jswww.exeter.ac.uk/v8media/global/js/... https://www.exeter.ac.uk/v8media/global/js/jquery-2.2.4.min.js — 200 — 30.0 KiB — 33 ms — h2https://www.exeter.ac.uk/v8media/global/js/bootstrap-3-4-1.min.jswww.exeter.ac.uk/v8media/global/js/... https://www.exeter.ac.uk/v8media/global/js/bootstrap-3-4-1.min.js — 200 — 11.5 KiB — 28 ms — h2https://www.exeter.ac.uk/v8media/global/js/lite-yt-embed.jswww.exeter.ac.uk/v8media/global/js/... https://www.exeter.ac.uk/v8media/global/js/lite-yt-embed.js — 200 — 2.7 KiB — 33 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/Elsie-639x600.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/Elsie-639x600.webp — 200 — 19.0 KiB — 29 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/Namit-639x699.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/Namit-639x699.webp — 200 — 15.6 KiB — 36 ms — h2https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/Hugo-639x600.webpwww.exeter.ac.uk/v8media/recruitmen... https://www.exeter.ac.uk/v8media/recruitmentsites/images/homepage/Hugo-639x600.webp — 200 — 18.8 KiB — 36 ms — 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h2https://heatmaps.monsido.com/v1/settings/Tmau_RWSXwFGWEJp6JjVTQ.jsonheatmaps.monsido.com/v1/settings/Tm... https://heatmaps.monsido.com/v1/settings/Tmau_RWSXwFGWEJp6JjVTQ.json — 200 — 742 B — 41 ms — h3https://pagecorrect.monsido.com/v1/settings/Tmau_RWSXwFGWEJp6JjVTQ.jsonpagecorrect.monsido.com/v1/settings... https://pagecorrect.monsido.com/v1/settings/Tmau_RWSXwFGWEJp6JjVTQ.json — 200 — 30 B — 46 ms — h3https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svg — 200 — 513 B — 38 ms — h2https://cdn-ukwest.onetrust.com/logos/7df3e28c-9ad3-422f-9da1-52f114f103cb/018f3e1d-b383-76f2-856c-0b48a854b7e0/a7525491-cd84-4683-aaaf-8883e8a09c0e/uoe-logo-square.jpgcdn-ukwest.onetrust.com/logos/7df3e... https://cdn-ukwest.onetrust.com/logos/7df3e28c-9ad3-422f-9da1-52f114f103cb/018f3e1d-b383-76f2-856c-0b48a854b7e0/a7525491-cd84-4683-aaaf-8883e8a09c0e/uoe-logo-square.jpg — 200 — 23.2 KiB — 36 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-S2L9JPLZ1E&gtm=45je64h1v9248172581z879718996za20gzb79718996zd79718996&_p=1776813211530&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&are=1&cid=1416364332.1776813212&frm=0&pscdl=denied&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401&dp=%2F&uid=&sid=1776813211&sct=1&seg=0&dl=https%3A%2F%2Fwww.exeter.ac.uk%2F&dt=University%20of%20Exeter%20%7C%20A%20Top%20Worldwide%20University&en=page_view&_fv=1&_nsi=1&_ss=1&ep.analytics_id=1776813211775.f06te0os&tfd=1076region1.google-analytics.com/g/coll... 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-D45K1N753J&gtm=45je64h1v888203149z879718996za20gzb79718996zd79718996&_p=1776813211530&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&_eu=EAAAAGA&are=1&cid=1416364332.1776813212&frm=0&ir=1&pscdl=denied&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117884344&dp=%2F&uid=&sid=1776813211&sct=1&seg=0&dl=https%3A%2F%2Fwww.exeter.ac.uk%2F&dt=University%20of%20Exeter%20%7C%20A%20Top%20Worldwide%20University&en=page_view&_fv=1&_ss=1&ep.analytics_id=1776813211775.f06te0os&tfd=1098region1.google-analytics.com/g/coll... 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h2https://pagead2.googlesyndication.com/ccm/collect?rcb=18&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.exeter.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1043664013.1776813212&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1v79718996za200zd79718996xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938469~117266401&apve=1&apvf=f&apvc=1&tft=1776813212453&tfd=1099pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=18&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.exeter.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1043664013.1776813212&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1v79718996za200zd79718996xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115938466~115938469~117266401&apve=1&apvf=f&apvc=1&tft=1776813212453&tfd=1099 — 200 — 21 B — 76 ms — h3https://b.clarity.ms/collectb.clarity.ms/collect https://b.clarity.ms/collect — 204 — 280 B — 199 ms — http/1.1
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 547ms · 548KB · £6/mo
Unattributable
Other
Optional
Execution 160ms
Transfer 0 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 101ms
Transfer 207 KB
Unused 31%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 80ms
Transfer 169 KB
Unused 39%
Monthly Cost £1/mo
www.exeter.ac.uk
Other
Optional
Execution 79ms
Transfer 17 KB
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 67ms
Transfer 129 KB
Unused 54%
Monthly Cost £1/mo
Microsoft Clarity
Session Replay
Optional
Execution 60ms
Transfer 26 KB
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

54% of cdn-ukwest.onetrust.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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