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https://exeter.ac.uk

Performance

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

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

Mobile Desktop
62
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.

2.58 s

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

4.06 s

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

850 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.

3.56 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.

12.30 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2662ms total JS execution
FIX
2662ms total JS execution
Warning::
Unattributable: 568ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K4N...: 373ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S2L9...: 364ms CPU time
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 312ms CPU time
Warning::
https://www.exeter.ac.uk/: 256ms CPU time
Warning::
Third-party scripts: 2662ms (100% of total)

Main Thread Breakdown

Script Evaluation 63% Other 16% Script Parsing & Compilation 9% Style & Layout 6%
ScriptTotalScriptingParse/CompileParty
Unattributable568ms187ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K4NS9FB373ms305ms61ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S2L9JPLZ1E&cx=c&gtm=4e64h1h1364ms315ms46ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js312ms234ms41ms3rd
https://www.exeter.ac.uk/256ms18ms5ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js245ms215ms8ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D45K1N753J&cx=c&gtm=4e64h1h1237ms180ms55ms3rd
https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922/main.259ac94de0fe3b10fc58.js169ms144ms24ms3rd
https://try.abtasty.com/shared/analytics.a89c163c443e657a7975.js80ms34ms3ms3rd
https://www.exeter.ac.uk/v8media/global/js/jquery-2.2.4.min.js58ms46ms7ms3rd
D
JS Bundles
Action
22 scripts, 301 KB unused
FIX
22 scripts, 301 KB unused
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 69 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-D45K...: 66 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S2L9...: 66 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...: 36 KB unused (56%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 301 KB
301 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn-ukwest.onetrust.com/scripttemplates/202602.1.0/otBannerSdk.js129 KB69 KB (53%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-D45K1N753J&cx=c&gtm=4e64h1h1169 KB66 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S2L9JPLZ1E&cx=c&gtm=4e64h1h1157 KB66 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K4NS9FB207 KB64 KB (31%)✓3rd
https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922/main.259ac94de0fe3b10fc58.js64 KB36 KB (56%)✓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
74 resources · 1.5 MB · 301 KB savings available
FIX
74 resources · 1.5 MB · 301 KB savings available
Warning::
Page weight 560 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~301 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
1 resources over 200KB
74 resources · 1.5 MiB · 73 third-party 560.0 KiB over 1MB target
JavaScript 56% · 883.8 KiB
Image 24% · 386.2 KiB
Font 14% · 220.9 KiB
CSS 3% · 46.8 KiB
Other 2% · 28.8 KiB
Document 1% · 17.5 KiB

~301.1 KiB of savings available

Remove unused JavaScript: 301.1 KiB
B
Page Weight Budget
1.5 MB transferred, 74 requests
REVIEW
1.5 MB transferred, 74 requests
Info::
Page weighs 4.0 MB (1.5 MB transferred)
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::
74 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
74 requests
0.32 g CO2 per page load
JavaScript 847.4 KiB 53%
Images 370.5 KiB 23%
Fonts 220.9 KiB 14%
Other 66.2 KiB 4%
CSS 42.1 KiB 3%
HTML 16.9 KiB 1%
Other 15.4 KiB 1%
Other 4.2 KiB 0%
Other 325 B 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
Image Optimization
Action
22 images, 0 KB saveable
REVIEW
22 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://www.exeter.ac.uk/v8media/recruitmentsites/... 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://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.
22 images 370 KB
0 oversized -0 KB
9 legacy format
12 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

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 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.6 s LCP 4.1 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 — 98 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 — 42 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 — 60 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 — 40 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 — 62 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 — 47 ms — font-display: swap
outfit-v11-latin_latin-... woff2 swap
Size 18 KB
Load time 98 ms
Start 146 ms
Risk FOUT — text flashes from fallback to web font
outfit-v11-latin_latin-... woff2 swap
Size 18 KB
Load time 42 ms
Start 146 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 60 ms
Start 146 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 14 KB
Load time 40 ms
Start 147 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 62 ms
Start 147 ms
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff2 swap
Size 18 KB
Load time 47 ms
Start 280 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
15 hints, 0 missing preconnects
PASS
15 hints, 0 missing preconnects
Info::
Page uses 15 resource hint(s)

Current Resource Hints

preconnect
3
preload
+2
12
dns-prefetch
—
prefetch
—

15 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
A
HTTP Caching
max-age=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
74 requests over 3341ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 2.6 s LCP 4.1 shttps://exeter.ac.uk// https://exeter.ac.uk/ — 301 — 550 B — 117 ms — h2https://www.exeter.ac.uk/www.exeter.ac.uk/ https://www.exeter.ac.uk/ — 200 — 16.9 KiB — 18 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 — 98 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 — 42 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 — 60 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 — 40 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 — 62 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 — 45 ms — h2https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922.jstry.abtasty.com/25815a6dd8d07c10e8a... https://try.abtasty.com/25815a6dd8d07c10e8a6399806c4f922.js — 200 — 2.4 KiB — 66 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 — 58 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 — 44 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 — 42 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 — 46 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 — 58 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 — 56 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 — 49 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 — 58 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 — 59 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 — 71 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 — 86 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 — 84 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 — 47 ms — 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h2https://region1.google-analytics.com/g/collect?v=2&tid=G-S2L9JPLZ1E&gtm=45je64h1h1v9248172581z879718996za20gzb79718996zd79718996&_p=1776813196579&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&are=1&cid=296758768.1776813198&frm=0&pscdl=denied&rcb=3&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117384405~118128923&dp=%2F&uid=&sid=1776813197&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=1776813196831.rfpf0u&tfd=1157region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-S2L9JPLZ1E&gtm=45je64h1h1v9248172581z879718996za20gzb79718996zd79718996&_p=1776813196579&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&are=1&cid=296758768.1776813198&frm=0&pscdl=denied&rcb=3&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~117384405~118128923&dp=%2F&uid=&sid=1776813197&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=1776813196831.rfpf0u&tfd=1157 — 204 — 550 B — 90 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-D45K1N753J&gtm=45je64h1h1v888203149z879718996za20gzb79718996zd79718996&_p=1776813196579&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&_eu=EAAAAGA&are=1&cid=296758768.1776813198&frm=0&ir=1&pscdl=denied&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401&dp=%2F&uid=&sid=1776813196&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=1776813196831.rfpf0u&tfd=1185region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-D45K1N753J&gtm=45je64h1h1v888203149z879718996za20gzb79718996zd79718996&_p=1776813196579&gcs=G100&gcd=13p3p3p2p5l1&npa=1&dma_cps=-&dma=1&gdid=dYWJhMj&_eu=EAAAAGA&are=1&cid=296758768.1776813198&frm=0&ir=1&pscdl=denied&rcb=9&sr=412x823&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401&dp=%2F&uid=&sid=1776813196&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=1776813196831.rfpf0u&tfd=1185 — 204 — 48 B — 63 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.exeter.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1623529653.1776813198&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1h1v79718996za200zd79718996xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~117884344&apve=1&apvf=f&apvc=1&tft=1776813197563&tfd=1187pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.exeter.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1623529653.1776813198&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dYWJhMj&gtm=45He64h1h1v79718996za200zd79718996xea&gcs=G100&gcd=13p3p3p2p5l1&dma_cps=-&dma=1&tag_exp=0~115616986~115938465~115938469~117266400~117884344&apve=1&apvf=f&apvc=1&tft=1776813197563&tfd=1187 — 200 — 21 B — 98 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 2662ms · 807KB · £28/mo
Unattributable
Other
Costly
Execution 568ms
Transfer 0 KB
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 373ms
Transfer 207 KB
Unused 31%
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 364ms
Transfer 157 KB
Unused 42%
Monthly Cost £4/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 312ms
Transfer 129 KB
Unused 53%
Monthly Cost £3/mo
www.exeter.ac.uk
Other
Costly
Execution 256ms
Transfer 17 KB
Monthly Cost £3/mo
Microsoft Clarity
Session Replay
Costly
Execution 245ms
Transfer 26 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 237ms
Transfer 169 KB
Unused 39%
Monthly Cost £2/mo
try.abtasty.com
Other
Optional
Execution 169ms
Transfer 64 KB
Unused 56%
Monthly Cost £2/mo
try.abtasty.com
Other
Optional
Execution 80ms
Transfer 8 KB
Monthly Cost £1/mo
www.exeter.ac.uk
Other
Optional
Execution 58ms
Transfer 30 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Unattributable adds 568ms and costs ~£6/month
  • Google Tag Manager adds 373ms and costs ~£4/month
  • Google Tag Manager adds 364ms and costs ~£4/month
  • cdn-ukwest.onetrust.com adds 312ms and costs ~£3/month
  • www.exeter.ac.uk adds 256ms and costs ~£3/month
  • Microsoft Clarity adds 245ms and costs ~£3/month
  • Google Tag Manager adds 237ms and costs ~£2/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

Unattributable takes 568ms 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 373ms 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 364ms 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

cdn-ukwest.onetrust.com takes 312ms 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

53% 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

www.exeter.ac.uk takes 256ms 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

Microsoft Clarity takes 245ms 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 237ms 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 try.abtasty.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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