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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
45
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.
96
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.

3.23 s

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

6.19 s

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

140 ms

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

0.306

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

11.14 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.

7.67 s

Page Load Progression

1.5 s
3.0 s
4.6 s
6.1 s
7.6 s
9.2 s
10.7 s
12.2 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
2.8 MB transferred, 65 requests
FIX
2.8 MB transferred, 65 requests
Warning::
Page weighs 10.9 MB (2.8 MB transferred)
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 955 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 955 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::
65 HTTP requests
Info::
Estimated 0.59 g CO2 per page load
2.8 MB / 2.4 MB budget
2.8 MB transferred
65 requests
0.59 g CO2 per page load
JavaScript 1012.1 KiB 35%
Fonts 954.6 KiB 33%
Images 524.6 KiB 18%
CSS 249.2 KiB 9%
HTML 122.5 KiB 4%
Other 3.4 KiB 0%
Other 1.4 KiB 0%
Other 990 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

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 (2.8 MiB of 2.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2312ms total JS execution
FIX
2312ms total JS execution
Warning::
https://www.abdn.ac.uk/: 1214ms CPU time
Warning::
Unattributable: 351ms CPU time
Warning::
https://code.jquery.com/jquery-3.6.0.min.js: 290ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 182ms CPU time
Info::
https://www.abdn.ac.uk/global/cookies/v2/js/cookie...: 110ms CPU time
Warning::
Third-party scripts: 2312ms (100% of total)

Main Thread Breakdown

Other 35% Style & Layout 26% Script Evaluation 19% Rendering 13% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.abdn.ac.uk/1214ms7ms1ms3rd
Unattributable351ms4ms0ms3rd
https://code.jquery.com/jquery-3.6.0.min.js290ms162ms6ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js182ms145ms36ms3rd
https://www.abdn.ac.uk/global/cookies/v2/js/cookie-consent.js110ms50ms1ms3rd
https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/css/abdn-design-system-site.css98ms0ms0ms3rd
https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/js/abdn-design-system-site.js68ms49ms18ms3rd
D
Page Weight Inventory
Action
65 resources · 2.8 MB · 90 KB savings available
FIX
65 resources · 2.8 MB · 90 KB savings available
Warning::
Page weight 1.8 MB over 1MB target
Got: 2.8 MB Expected: ≤ 1 MB
Info::
~90 KB of savings available
Warning::
64 third-party resources (100% of weight)
Info::
3 resources over 200KB
65 resources · 2.8 MiB · 64 third-party 1.8 MiB over 1MB target
JavaScript 35% · 1012.1 KiB
Font 33% · 954.6 KiB
Image 18% · 527.2 KiB
CSS 9% · 249.2 KiB
Document 4% · 123.3 KiB
Other 0% · 2.3 KiB

~89.9 KiB of savings available

Remove unused JavaScript: 89.9 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
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Warning::
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/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/600x214/media/site/home... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.abdn.ac.uk/img/600x214/media/site/home... 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.
22 images 525 KB
0 oversized -0 KB
19 legacy format
8 missing dimensions CLS risk

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

B
JS Bundles
17 scripts, 90 KB unused
REVIEW
17 scripts, 90 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 (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 90 KB
90 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 (69%)✓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
https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/typeahead.bundle-0.11.1.min.js12 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://code.jquery.com/jquery-3.6.0.min.js31 KB—✓3rd
https://abdn-search.funnelback.squiz.cloud/s/resources-global/js/funnelback.autocompletion-2.6.0.js8 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
7 fonts (955 KB)
PASS
7 fonts (955 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

955 KB total

Render-blocking

0

of 7

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.2 s LCP 6.2 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 — 140 ms — font-display: swaphttps://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/custom-icons.woff2custom-icons.woff2 https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/custom-icons.woff2 — 1.7 KiB — 64 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 — 224 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 — 463 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 — 274 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 76 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
lexend-deca-latin.woff2 woff2 swap
Size 39 KB
Load time 140 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
custom-icons.woff2 woff2 swap
Size 2 KB
Load time 64 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 416 KB
Load time 224 ms
Start 1.4 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-solid-900.woff2 woff2 swap
Size 346 KB
Load time 463 ms
Start 1.4 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 274 ms
Start 1.4 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 76 ms
Start 1.6 s
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 10.0 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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
5
preload
8
dns-prefetch
—
prefetch
—

13 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
Network Waterfall
65 requests over 10955ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s FCP 3.2 s LCP 6.2 shttps://abdn.ac.uk// https://abdn.ac.uk/ — 301 — 789 B — 244 ms — http/1.1https://www.abdn.ac.uk/www.abdn.ac.uk/ https://www.abdn.ac.uk/ — 200 — 12.3 KiB — 857 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 — 242 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 — 45 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 — 160 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 — 162 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 — 80 ms — http/1.1https://www.abdn.ac.uk/img/600x214/media/site/home/parkpage-vibrant-sq2.jpgwww.abdn.ac.uk/img/600x214/media/si... https://www.abdn.ac.uk/img/600x214/media/site/home/parkpage-vibrant-sq2.jpg — 200 — 53.2 KiB — 115 ms — http/1.1https://www.abdn.ac.uk/img/600x214/media/site/home/provost-house-sq.jpgwww.abdn.ac.uk/img/600x214/media/si... https://www.abdn.ac.uk/img/600x214/media/site/home/provost-house-sq.jpg — 200 — 48.6 KiB — 110 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 — 41 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 — 39 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 — 117 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 — 8.5 s — 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 — 8.5 s — http/1.1https://www.abdn.ac.uk/img/300x/media/university-of-aberdeen/content-assets/images/Stats-background[1].jpgwww.abdn.ac.uk/img/300x/media/unive... https://www.abdn.ac.uk/img/300x/media/university-of-aberdeen/content-assets/images/Stats-background[1].jpg — 200 — 1.7 KiB — 319 ms — http/1.1https://www.abdn.ac.uk/img/300x/media/university-of-aberdeen/content-assets/images/trilemma-mod.jpgwww.abdn.ac.uk/img/300x/media/unive... https://www.abdn.ac.uk/img/300x/media/university-of-aberdeen/content-assets/images/trilemma-mod.jpg — 200 — 17.2 KiB — 342 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 — 140 ms — http/1.1https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/custom-icons.woff2www.abdn.ac.uk/abdn-design-system/r... https://www.abdn.ac.uk/abdn-design-system/releases/3.0.5/dist/webfonts/custom-icons.woff2 — 200 — 1.7 KiB — 64 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 — 224 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 — 463 ms — 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https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=r78Drb — 200 — 0 B — 1 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 31 ms — h3https://i.ytimg.com/vi_webp/YjwWEBZzcZM/sddefault.webpi.ytimg.com/vi_webp/YjwWEBZzcZM/sdd... https://i.ytimg.com/vi_webp/YjwWEBZzcZM/sddefault.webp — 200 — 40.7 KiB — 96 ms — h3https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 0 B — 0 ms — h3https://www.youtube.com/generate_204?Vip5EAwww.youtube.com/generate_204?Vip5EA https://www.youtube.com/generate_204?Vip5EA — 204 — 10 B — 28 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 145 B — 33 ms — h3
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 2312ms · 365KB · £24/mo
www.abdn.ac.uk
Other
Costly
Execution 1214ms
Transfer 12 KB
Monthly Cost £13/mo
Unattributable
Other
Costly
Execution 351ms
Transfer 0 KB
Monthly Cost £4/mo
code.jquery.com
Other
Costly
Execution 290ms
Transfer 31 KB
Monthly Cost £3/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 182ms
Transfer 123 KB
Unused 46%
Monthly Cost £2/mo
www.abdn.ac.uk
Other
Optional
Execution 110ms
Transfer 5 KB
Monthly Cost £1/mo
www.abdn.ac.uk
Other
Optional
Execution 98ms
Transfer 146 KB
Monthly Cost £1/mo
www.abdn.ac.uk
Other
Optional
Execution 68ms
Transfer 48 KB
Unused 69%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.abdn.ac.uk adds 1214ms and costs ~£13/month
  • Unattributable adds 351ms and costs ~£4/month
  • code.jquery.com adds 290ms and costs ~£3/month

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

Why this matters

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

Learn more ▾

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

Source: web.dev

www.abdn.ac.uk takes 1214ms 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 351ms 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

code.jquery.com takes 290ms 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

69% of www.abdn.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

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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