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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
60
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

1.06 s

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

2.66 s

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

5 ms

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

0.449

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

2.12 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.

2.66 s

Page Load Progression

568 ms
1.1 s
1.7 s
2.3 s
2.8 s
3.4 s
4.0 s
4.5 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 55 requests
FIX
3.7 MB transferred, 55 requests
Warning::
Page weighs 8.2 MB (3.7 MB transferred)
Warning::
Images are 1.4 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.4 MB
Warning::
JavaScript is 1012 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1012 KB
Info::
Fonts are 953 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 953 KB
Info::
CSS is 249 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 249 KB
Info::
55 HTTP requests
Info::
Estimated 0.77 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
55 requests
0.77 g CO2 per page load
Images 1.4 MiB 39%
JavaScript 1012.0 KiB 27%
Fonts 952.9 KiB 25%
CSS 249.2 KiB 7%
HTML 68.3 KiB 2%
Other 3.4 KiB 0%
Other 1.0 KiB 0%
Other 990 B 0%
Other 0 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

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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
55 resources · 3.7 MB · 89 KB savings available
FIX
55 resources · 3.7 MB · 89 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~89 KB of savings available
Warning::
54 third-party resources (100% of weight)
Info::
5 resources over 200KB
55 resources · 3.7 MiB · 54 third-party 2.7 MiB over 1MB target
Image 39% · 1.4 MiB
JavaScript 27% · 1012.0 KiB
Font 25% · 952.9 KiB
CSS 7% · 249.2 KiB
Document 2% · 69.1 KiB
Other 0% · 2.0 KiB

~89.4 KiB of savings available

Remove unused JavaScript: 89.4 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
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.abdn.ac.uk/img/450x254/uploads/news/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/450x/media/archive/libr... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/2400x1020/media/site/ho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/450x/media/site/home/to... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/450x254/uploads/news/im... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/2400x1020/media/site/ho... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/450x/media/university-o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/450x/media/university-o... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 1.4 MB
0 oversized -0 KB
23 legacy format
8 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

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
658ms total JS execution
REVIEW
658ms total JS execution
Warning::
https://www.abdn.ac.uk/: 417ms CPU time
Info::
https://code.jquery.com/jquery-3.6.0.min.js: 108ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 55ms CPU time
Warning::
Third-party scripts: 658ms (100% of total)

Main Thread Breakdown

Other 36% Style & Layout 33% Script Evaluation 16% Rendering 8% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.abdn.ac.uk/417ms3ms0ms3rd
https://code.jquery.com/jquery-3.6.0.min.js108ms39ms2ms3rd
Unattributable78ms1ms0ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js55ms43ms11ms3rd
B
JS Bundles
12 scripts, 89 KB unused
REVIEW
12 scripts, 89 KB unused
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 57 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.abdn.ac.uk/abdn-design-system/releases...: 33 KB unused (68%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://abdn-search.funnelback.squiz.cloud/s/resou...: unminified — 3 KB could be saved
Info::
Total unused JavaScript: 89 KB
89 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB57 KB (46%)✓3rd
https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/js/abdn-design-system-site.js48 KB33 KB (68%)✓3rd
https://code.jquery.com/jquery-3.6.0.min.js31 KB—✓3rd
https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/typeahead.bundle-0.11.1.min.js12 KB—✓3rd
https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/funnelback.autocompletion-2.6.0.js8 KB—✗3rd
https://www.abdn.ac.uk/global/cookies/v2/js/cookie-consent.js5 KB—✓3rd
https://www.abdn.ac.uk/apps/prospectus-search/assets/scripts/aurora/prospectus-search.js2 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base140 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://static.doubleclick.net/instream/ad_status.js0 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

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
5 fonts (953 KB)
PASS
5 fonts (953 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

953 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 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.1 s LCP 2.7 shttps://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/lexend-deca-latin.woff2lexend-deca-latin.woff2 https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/lexend-deca-latin.woff2 — 39.2 KiB — 115 ms — font-display: swaphttps://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-solid-900.woff2 — 346.4 KiB — 168 ms — font-display: swaphttps://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-regular-400.woff2 — 416.2 KiB — 528 ms — font-display: swaphttps://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-brands-400.woff2 — 117.2 KiB — 304 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 80 ms — font-display: swap
lexend-deca-latin.woff2 woff2 swap
Size 39 KB
Load time 115 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 346 KB
Load time 168 ms
Start 1.5 s
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
fa-regular-400.woff2 woff2 swap
Size 416 KB
Load time 528 ms
Start 1.5 s
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
fa-brands-400.woff2 woff2 swap
Size 117 KB
Load time 304 ms
Start 1.5 s
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
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 80 ms
Start 1.7 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)

Fixing the unchecked items could save ~440 KB and ~880 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
55 requests over 2874ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.1 s LCP 2.7 shttps://abdn.ac.uk// https://abdn.ac.uk/ — 301 — 789 B — 221 ms — http/1.1https://www.abdn.ac.uk/www.abdn.ac.uk/ https://www.abdn.ac.uk/ — 200 — 12.3 KiB — 846 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/css/abdn-design-system-site.csswww.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/css/abdn-design-system-site.css — 200 — 145.8 KiB — 237 ms — http/1.1https://code.jquery.com/jquery-3.6.0.min.jscode.jquery.com/jquery-3.6.0.min.js https://code.jquery.com/jquery-3.6.0.min.js — 200 — 30.5 KiB — 13 ms — h2https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/images/layout/UoA_Primary_Logo_MONO_white.svgwww.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/images/layout/UoA_Primary_Logo_MONO_white.svg — 200 — 17.5 KiB — 161 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/images/icons/manifest.jsonwww.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/images/icons/manifest.json — 200 — 990 B — 166 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/js/abdn-design-system-site.jswww.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/js/abdn-design-system-site.js — 200 — 48.1 KiB — 81 ms — http/1.1https://www.abdn.ac.uk/img/2400x1020/media/site/home/parkpage-vibrant-sq2.jpgwww.abdn.ac.uk/img/2400x1020/media/... https://www.abdn.ac.uk/img/2400x1020/media/site/home/parkpage-vibrant-sq2.jpg — 200 — 310.3 KiB — 227 ms — http/1.1https://www.abdn.ac.uk/img/2400x1020/media/site/home/provost-house-sq.jpgwww.abdn.ac.uk/img/2400x1020/media/... https://www.abdn.ac.uk/img/2400x1020/media/site/home/provost-house-sq.jpg — 200 — 300.2 KiB — 267 ms — http/1.1https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/typeahead.bundle-0.11.1.min.jsabdn-search.funnelback.squiz.cloud/... https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/typeahead.bundle-0.11.1.min.js — 200 — 12.1 KiB — 46 ms — h3https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/funnelback.autocompletion-2.6.0.jsabdn-search.funnelback.squiz.cloud/... https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/funnelback.autocompletion-2.6.0.js — 200 — 8.2 KiB — 45 ms — h3https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.jscc.cdn.civiccomputing.com/9/cookieC... https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js — 200 — 123.3 KiB — 116 ms — h3https://www.abdn.ac.uk/global/cookies/v2/js/cookie-consent.jswww.abdn.ac.uk/global/cookies/v2/js... https://www.abdn.ac.uk/global/cookies/v2/js/cookie-consent.js — 200 — 4.6 KiB — 203 ms — http/1.1https://www.abdn.ac.uk/apps/prospectus-search/assets/scripts/aurora/prospectus-search.jswww.abdn.ac.uk/apps/prospectus-sear... https://www.abdn.ac.uk/apps/prospectus-search/assets/scripts/aurora/prospectus-search.js — 200 — 2.4 KiB — 209 ms — http/1.1https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/Stats-background[1].jpgwww.abdn.ac.uk/img/1200x/media/univ... https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/Stats-background[1].jpg — 200 — 11.7 KiB — 159 ms — http/1.1https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/trilemma-mod.jpgwww.abdn.ac.uk/img/1200x/media/univ... https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/trilemma-mod.jpg — 200 — 139.6 KiB — 413 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/lexend-deca-latin.woff2www.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/lexend-deca-latin.woff2 — 200 — 39.2 KiB — 115 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-solid-900.woff2www.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-solid-900.woff2 — 200 — 346.4 KiB — 168 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-regular-400.woff2www.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-regular-400.woff2 — 200 — 416.2 KiB — 528 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-brands-400.woff2www.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/fa-brands-400.woff2 — 200 — 117.2 KiB — 304 ms — http/1.1https://www.youtube.com/embed/YjwWEBZzcZM?si=iaz_guaeRvbLkdldwww.youtube.com/embed/YjwWEBZzcZM?s... https://www.youtube.com/embed/YjwWEBZzcZM?si=iaz_guaeRvbLkdld — -1 — 0 B — 100 ms — https://www.abdn.ac.uk/img/450x/media/site/home/top-20-icon.pngwww.abdn.ac.uk/img/450x/media/site/... https://www.abdn.ac.uk/img/450x/media/site/home/top-20-icon.png — 200 — 16.5 KiB — 160 ms — http/1.1https://www.abdn.ac.uk/img/450x/media/university-of-aberdeen/content-assets/images/NSS_stat[1].pngwww.abdn.ac.uk/img/450x/media/unive... https://www.abdn.ac.uk/img/450x/media/university-of-aberdeen/content-assets/images/NSS_stat[1].png — 200 — 16.7 KiB — 163 ms — http/1.1https://www.abdn.ac.uk/img/450x/media/university-of-aberdeen/content-assets/images/sustainable-icon[1].pngwww.abdn.ac.uk/img/450x/media/unive... https://www.abdn.ac.uk/img/450x/media/university-of-aberdeen/content-assets/images/sustainable-icon[1].png — 200 — 16.2 KiB — 220 ms — http/1.1https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/nav-alumni-wide1.jpgwww.abdn.ac.uk/img/1200x/media/univ... https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/nav-alumni-wide1.jpg — 200 — 54.7 KiB — 228 ms — http/1.1https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/nav-research3-wide.jpgwww.abdn.ac.uk/img/1200x/media/univ... https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/nav-research3-wide.jpg — 200 — 25.2 KiB — 256 ms — http/1.1https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/nav-alumni-wide2.jpgwww.abdn.ac.uk/img/1200x/media/univ... https://www.abdn.ac.uk/img/1200x/media/university-of-aberdeen/content-assets/images/nav-alumni-wide2.jpg — 200 — 62.6 KiB — 296 ms — http/1.1https://www.abdn.ac.uk/img/1200x/media/site/about/content-images/bum_5835_3591134459_o.jpgwww.abdn.ac.uk/img/1200x/media/site... https://www.abdn.ac.uk/img/1200x/media/site/about/content-images/bum_5835_3591134459_o.jpg — 200 — 108.9 KiB — 350 ms — http/1.1https://apikeys.civiccomputing.com/c/v?d=www.abdn.ac.uk&p=CookieControl%20Multi-Site&v=9&k=eab27a96ac036205227c0dd111eec7e00118dc71&format=jsonapikeys.civiccomputing.com/c/v?d=ww... https://apikeys.civiccomputing.com/c/v?d=www.abdn.ac.uk&p=CookieControl%20Multi-Site&v=9&k=eab27a96ac036205227c0dd111eec7e00118dc71&format=json — 200 — 615 B — 69 ms — h3https://www.youtube.com/embed/YjwWEBZzcZM?si=iaz_guaeRvbLkdldwww.youtube.com/embed/YjwWEBZzcZM?s... https://www.youtube.com/embed/YjwWEBZzcZM?si=iaz_guaeRvbLkdld — 200 — 56.0 KiB — 106 ms — h2
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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 658ms · 166KB · £7/mo
www.abdn.ac.uk
Other
Costly
Execution 417ms
Transfer 12 KB
Monthly Cost £4/mo
code.jquery.com
Other
Optional
Execution 108ms
Transfer 31 KB
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 78ms
Transfer 0 KB
Monthly Cost £1/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 55ms
Transfer 123 KB
Unused 46%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.abdn.ac.uk adds 417ms and costs ~£4/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.abdn.ac.uk takes 417ms 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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