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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
28
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
99
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

9.53 s

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

14.83 s

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

1.99 s

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.

9.53 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.

20.32 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
4.9 MB transferred, 89 requests
FIX
4.9 MB transferred, 89 requests
Critical::
Page weighs 22.3 MB (4.9 MB transferred)
Warning::
JavaScript is 4.1 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 4.1 MB
Info::
CSS is 259 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 259 KB
Info::
89 HTTP requests
Info::
Estimated 1.0 g CO2 per page load
4.9 MB / 2.4 MB budget
4.9 MB transferred
89 requests
1.0 g CO2 per page load
JavaScript 4.1 MiB 83%
Images 260.9 KiB 5%
CSS 259.4 KiB 5%
Fonts 181.2 KiB 4%
HTML 120.0 KiB 2%
Other 19.6 KiB 0%
Other 4.5 KiB 0%
Other 1.7 KiB 0%
Other 828 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (4.9 MiB of 4.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
5708ms total JS execution
FIX
5708ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KW2...: 1384ms CPU time
Warning::
https://www.st-andrews.ac.uk/: 1112ms CPU time
Warning::
https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scrip...: 505ms CPU time
Warning::
https://oc-cdn-public-gbr.azureedge.net/livechatwi...: 447ms CPU time
Warning::
https://scripts.clarity.ms/0.8.59/clarity.js: 446ms CPU time
Warning::
Third-party scripts: 5708ms (100% of total)

Main Thread Breakdown

Script Evaluation 58% Other 18% Script Parsing & Compilation 10% Style & Layout 9% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-KW2XNGZ1384ms1128ms92ms3rd
https://www.st-andrews.ac.uk/1112ms80ms4ms3rd
https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/core.min.js505ms326ms29ms3rd
https://oc-cdn-public-gbr.azureedge.net/livechatwidget/scripts/LiveChatBootstrapper.js447ms299ms147ms3rd
https://scripts.clarity.ms/0.8.59/clarity.js446ms408ms10ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js430ms310ms120ms3rd
Unattributable411ms28ms0ms3rd
https://www.googletagmanager.com/gtag/destination?id=DC-14394766&cx=c&gtm=4e64h1368ms313ms53ms3rd
https://connect.facebook.net/en_US/fbevents.js224ms148ms69ms3rd
https://connect.facebook.net/signals/config/115868994842088?v=2.9.303&r=stable&domain=www.st-andrews.ac.uk&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168221ms165ms56ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
33 scripts, 361 KB unused
FIX
33 scripts, 361 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KW2...: 67 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://oc-cdn-public-gbr.azureedge.net/livechatwi...: 66 KB unused (59%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/destination?...: 62 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 57 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scrip...: 49 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 361 KB
361 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-KW2XNGZ183 KB67 KB (37%)✓3rd
https://oc-cdn-public-gbr.azureedge.net/livechatwidget/scripts/LiveChatBootstrapper.js114 KB66 KB (59%)✓3rd
https://www.googletagmanager.com/gtag/destination?id=DC-14394766&cx=c&gtm=4e64h1130 KB62 KB (48%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB57 KB (47%)✓3rd
https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/core.min.js89 KB49 KB (55%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/jquery.dataTables.min.js31 KB26 KB (82%)✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb146 KB—✓3rd
https://oc-cdn-public-gbr.azureedge.net/livechatwidget/v2scripts/react.production.min.js5 KB—✓3rd
https://www.youtube-nocookie.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js436 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
89 resources · 4.9 MB · 361 KB savings available
FIX
89 resources · 4.9 MB · 361 KB savings available
Warning::
Page weight 3.9 MB over 1MB target
Got: 4.9 MB Expected: ≤ 1 MB
Info::
~361 KB of savings available
Warning::
88 third-party resources (100% of weight)
Info::
5 resources over 200KB
89 resources · 4.9 MiB · 88 third-party 3.9 MiB over 1MB target
JavaScript 83% · 4.1 MiB
Image 5% · 264.8 KiB
CSS 5% · 259.4 KiB
Font 4% · 181.2 KiB
Document 2% · 120.0 KiB
Other 0% · 22.7 KiB

~361.2 KiB of savings available

Remove unused JavaScript: 361.2 KiB
C
Image Optimization
Action
15 images, 0 KB saveable
REVIEW
15 images, 0 KB saveable
Warning::
data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.st-andrews.ac.uk/assets/university/hom... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.st-andrews.ac.uk/assets/university/stu... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
15 images 201 KB
0 oversized -0 KB
12 legacy format
3 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
5 fonts (181 KB)
PASS
5 fonts (181 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

181 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 9.5 s LCP 14.8 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 39 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsans/v8/CWlc_g68BGYDSGdpJvpktgLUuEpTyoUstqEm5AMlJo4.woff2CWlc_g68BGYDSGdpJvpktgL... https://fonts.gstatic.com/s/ptsans/v8/CWlc_g68BGYDSGdpJvpktgLUuEpTyoUstqEm5AMlJo4.woff2 — 16.6 KiB — 36 ms — font-display: swaphttps://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/fonts/font-awesome/fa-solid-900.woff2fa-solid-900.woff2 https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/fonts/font-awesome/fa-solid-900.woff2 — 72.9 KiB — 163 ms — font-display: swaphttps://fonts.gstatic.com/s/ptsans/v8/0XxGQsSc1g4rdRdjJKZrNAzyDMXhdD8sAj6OAJTFsBI.woff20XxGQsSc1g4rdRdjJKZrNAz... https://fonts.gstatic.com/s/ptsans/v8/0XxGQsSc1g4rdRdjJKZrNAzyDMXhdD8sAj6OAJTFsBI.woff2 — 18.6 KiB — 29 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 39.2 KiB — 35 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 39 ms
Start 939 ms
Risk FOUT — text flashes from fallback to web font
CWlc_g68BGYDSGdpJvpktgL... woff2 swap
Size 17 KB
Load time 36 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 73 KB
Load time 163 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
0XxGQsSc1g4rdRdjJKZrNAz... woff2 swap
Size 19 KB
Load time 29 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 39 KB
Load time 35 ms
Start 2.1 s
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+
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
89 requests over 5649ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s FCP 9.5 s LCP 14.8 shttps://st-andrews.ac.uk// https://st-andrews.ac.uk/ — 302 — 59 B — 587 ms — h2https://www.st-andrews.ac.uk/www.st-andrews.ac.uk/ https://www.st-andrews.ac.uk/ — 200 — 10.5 KiB — 161 ms — h2https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/styles/screen.csswww.st-andrews.ac.uk/~cdn/dpl/1.27.... https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/styles/screen.css — 200 — 153.2 KiB — 614 ms — h2https://www.st-andrews.ac.uk/assets/university/homepage/images/hero-banner/online-short-couses-mobile.jpgwww.st-andrews.ac.uk/assets/univers... https://www.st-andrews.ac.uk/assets/university/homepage/images/hero-banner/online-short-couses-mobile.jpg — 200 — 65.6 KiB — 298 ms — h2https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/core.min.jswww.st-andrews.ac.uk/~cdn/dpl/1.27.... https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/core.min.js — 200 — 89.4 KiB — 455 ms — h2https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/jquery.dataTables.min.jswww.st-andrews.ac.uk/~cdn/dpl/1.27.... https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/jquery.dataTables.min.js — 200 — 31.4 KiB — 582 ms — h2https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/datatables.jswww.st-andrews.ac.uk/~cdn/dpl/1.27.... https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/datatables.js — 200 — 2.7 KiB — 440 ms — h2https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/lightbox.min.jswww.st-andrews.ac.uk/~cdn/dpl/1.27.... https://www.st-andrews.ac.uk/~cdn/dpl/1.27.5/scripts/lightbox.min.js — 200 — 3.1 KiB — 442 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KW2XNGZwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KW2XNGZ — 200 — 183.3 KiB — 101 ms — h2data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw== — 200 — 0 B — 0 ms — datahttps://www.youtube-nocookie.com/embed/FHdjbkLaVAU?rel=0www.youtube-nocookie.com/embed/FHdj... https://www.youtube-nocookie.com/embed/FHdjbkLaVAU?rel=0 — 200 — 54.5 KiB — 111 ms — h2https://www.youtube-nocookie.com/s/player/218d9d92/www-player.csswww.youtube-nocookie.com/s/player/2... https://www.youtube-nocookie.com/s/player/218d9d92/www-player.css — 200 — 56.9 KiB — 25 ms — h2https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.Z3F5ov4G3v8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywFC1GFUvUTMfxq9C5Vyf-b95XqJUwwww.youtube.com/s/_/ytembeds/_/ss/k... https://www.youtube.com/s/_/ytembeds/_/ss/k=ytembeds.base.Z3F5ov4G3v8.L.W.O/am=AAAABA/d=0/br=1/rs=AGKMywFC1GFUvUTMfxq9C5Vyf-b95XqJUw — 200 — 45.4 KiB — 44 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=root,basewww.youtube.com/s/_/ytembeds/_/js/k... 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https://www.googletagmanager.com/gtag/destination?id=DC-14394766&cx=c&gtm=4e64h1 — 200 — 129.7 KiB — 76 ms — h2https://oc-cdn-public-gbr.azureedge.net/livechatwidget/scripts/LiveChatBootstrapper.jsoc-cdn-public-gbr.azureedge.net/liv... https://oc-cdn-public-gbr.azureedge.net/livechatwidget/scripts/LiveChatBootstrapper.js — 200 — 113.5 KiB — 80 ms — h2https://connect.facebook.net/en_US/fbevents.jsconnect.facebook.net/en_US/fbevents... https://connect.facebook.net/en_US/fbevents.js — 200 — 96.6 KiB — 43 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 5708ms · 970KB · £59/mo
Google Tag Manager
Tag Manager
Costly
Execution 1384ms
Transfer 183 KB
Unused 37%
Monthly Cost £14/mo
www.st-andrews.ac.uk
Other
Costly
Execution 1112ms
Transfer 11 KB
Monthly Cost £12/mo
www.st-andrews.ac.uk
Other
Costly
Execution 505ms
Transfer 89 KB
Unused 55%
Monthly Cost £5/mo
oc-cdn-public-gbr.azureedge.net
Other
Costly
Execution 447ms
Transfer 114 KB
Unused 59%
Monthly Cost £5/mo
Microsoft Clarity
Session Replay
Costly
Execution 446ms
Transfer 26 KB
Monthly Cost £5/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 430ms
Transfer 123 KB
Unused 47%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 411ms
Transfer 0 KB
Monthly Cost £4/mo
Google Tag Manager
Tag Manager
Costly
Execution 368ms
Transfer 130 KB
Unused 48%
Monthly Cost £4/mo
Facebook Pixel
Advertising
Costly
Execution 224ms
Transfer 97 KB
Unused 35%
Monthly Cost £2/mo
Facebook Pixel
Advertising
Costly
Execution 221ms
Transfer 45 KB
Monthly Cost £2/mo
www.st-andrews.ac.uk
Other
Optional
Execution 160ms
Transfer 153 KB
Monthly Cost £2/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 1384ms and costs ~£14/month
  • www.st-andrews.ac.uk adds 1112ms and costs ~£12/month
  • www.st-andrews.ac.uk adds 505ms and costs ~£5/month
  • oc-cdn-public-gbr.azureedge.net adds 447ms and costs ~£5/month
  • Microsoft Clarity adds 446ms and costs ~£5/month
  • cc.cdn.civiccomputing.com adds 430ms and costs ~£4/month
  • Unattributable adds 411ms and costs ~£4/month
  • Google Tag Manager adds 368ms and costs ~£4/month
  • Facebook Pixel adds 224ms and costs ~£2/month
  • Facebook Pixel adds 221ms 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

Google Tag Manager takes 1384ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

www.st-andrews.ac.uk takes 1112ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

www.st-andrews.ac.uk takes 505ms 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

55% of www.st-andrews.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

oc-cdn-public-gbr.azureedge.net takes 447ms 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 oc-cdn-public-gbr.azureedge.net'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

Microsoft Clarity takes 446ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

cc.cdn.civiccomputing.com takes 430ms 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 411ms 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 368ms 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

Facebook Pixel takes 224ms 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

Facebook Pixel takes 221ms 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

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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