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https://york.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
48
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
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.

2.18 s

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

5.68 s

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

1.82 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.

3.86 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.

13.93 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
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6418ms total JS execution
FIX
6418ms total JS execution
Warning::
https://www.york.ac.uk/: 2502ms CPU time
Warning::
Unattributable: 1160ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WXL...: 897ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0E2C...: 566ms CPU time
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 298ms CPU time
Warning::
Third-party scripts: 6418ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 23% Style & Layout 12% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://www.york.ac.uk/2502ms1072ms227ms3rd
Unattributable1160ms29ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WXLX54897ms692ms111ms3rd
https://www.googletagmanager.com/gtag/js?id=G-0E2CPWLEXN&cx=c&gtm=4e64h1566ms502ms47ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js298ms250ms46ms3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js279ms248ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-11919936&cx=c&gtm=4e64h1191ms144ms46ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-16952590477&cx=c&gtm=4e64h1187ms142ms44ms3rd
https://www.york.ac.uk/static/2/js/icons.js170ms112ms1ms3rd
https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js95ms87ms7ms3rd

Showing top 10 of 11 scripts

D
JS Bundles
Action
21 scripts, 325 KB unused
FIX
21 scripts, 325 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-0E2C...: 67 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-169...: 64 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-119...: 59 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 56 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WXL...: 48 KB unused (25%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 325 KB
325 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-0E2CPWLEXN&cx=c&gtm=4e64h1170 KB67 KB (39%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-16952590477&cx=c&gtm=4e64h1145 KB64 KB (45%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-11919936&cx=c&gtm=4e64h1129 KB59 KB (46%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB56 KB (45%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WXLX54195 KB48 KB (25%)✓3rd
https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js55 KB31 KB (56%)✓3rd
https://dev.visualwebsiteoptimizer.com/cdn/edrv/worker-57f1b8d94a5f9167e9bcdcf861046428.br.js72 KB—✓3rd
https://dev.visualwebsiteoptimizer.com/dcdn/settings.js?a=890923&settings_type=4&ts=1776790816&dt=mobile&cc=US17 KB—✓3rd
https://www.york.ac.uk/static/2/js/components/submenu.js1 KB—✓3rd
https://www.york.ac.uk/static/2/js/components/tabs.js3 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
147 resources · 1.9 MB · 325 KB savings available
FIX
147 resources · 1.9 MB · 325 KB savings available
Warning::
Page weight 930 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~325 KB of savings available
Warning::
146 third-party resources (100% of weight)
Info::
1 resources over 200KB
147 resources · 1.9 MiB · 146 third-party 930.2 KiB over 1MB target
JavaScript 55% · 1.1 MiB
Image 37% · 728.6 KiB
Font 6% · 114.3 KiB
CSS 1% · 16.3 KiB
Document 1% · 10.8 KiB
Other 0% · 5.3 KiB

~325.4 KiB of savings available

Remove unused JavaScript: 325.4 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
Page Weight Budget
Action
1.9 MB transferred, 147 requests
REVIEW
1.9 MB transferred, 147 requests
Info::
Page weighs 5.0 MB (1.9 MB transferred)
Warning::
JavaScript is 872 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 872 KB
Warning::
147 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 0.40 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
147 requests
0.40 g CO2 per page load
JavaScript 871.9 KiB 45%
Images 714.7 KiB 37%
Other 210.5 KiB 11%
Fonts 114.3 KiB 6%
CSS 16.3 KiB 1%
Other 12.2 KiB 1%
HTML 10.8 KiB 1%
Other 2.9 KiB 0%
Other 526 B 0%
Other 0 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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 715 KB
0 oversized -0 KB
11 legacy format
0 missing dimensions CLS risk
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
3 fonts (114 KB)
PASS
3 fonts (114 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

114 KB total

Render-blocking

0

of 3

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 5.0 s FCP 2.2 s LCP 5.7 shttps://www.york.ac.uk/static/2/fonts/Graphik-Regular-Web.woff2Graphik-Regular-Web.woff2 https://www.york.ac.uk/static/2/fonts/Graphik-Regular-Web.woff2 — 35.9 KiB — 15 ms — font-display: swaphttps://www.york.ac.uk/static/2/fonts/Graphik-Semibold-Web.woff2Graphik-Semibold-Web.woff2 https://www.york.ac.uk/static/2/fonts/Graphik-Semibold-Web.woff2 — 40.0 KiB — 20 ms — font-display: swaphttps://www.york.ac.uk/static/2/fonts/YorkGrot_SemiBoldCondensed_v2.10.woff2YorkGrot_SemiBoldConden... https://www.york.ac.uk/static/2/fonts/YorkGrot_SemiBoldCondensed_v2.10.woff2 — 38.4 KiB — 24 ms — font-display: swap
Graphik-Regular-Web.woff2 woff2 swap
Size 36 KB
Load time 15 ms
Start 795 ms
Risk FOUT — text flashes from fallback to web font
Graphik-Semibold-Web.woff2 woff2 swap
Size 40 KB
Load time 20 ms
Start 797 ms
Risk FOUT — text flashes from fallback to web font
YorkGrot_SemiBoldConden... woff2 swap
Size 38 KB
Load time 24 ms
Start 797 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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
1
preload
5
dns-prefetch
—
prefetch
—

6 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
147 requests over 2840ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.2 s LCP 5.7 shttps://york.ac.uk// https://york.ac.uk/ — 302 — 172 B — 732 ms — http/1.0https://www.york.ac.uk/www.york.ac.uk/ https://www.york.ac.uk/ — 200 — 10.8 KiB — 40 ms — h2https://www.york.ac.uk/static/2/fonts/Graphik-Regular-Web.woff2www.york.ac.uk/static/2/fonts/Graph... https://www.york.ac.uk/static/2/fonts/Graphik-Regular-Web.woff2 — 200 — 35.9 KiB — 15 ms — h2https://www.york.ac.uk/static/2/fonts/Graphik-Semibold-Web.woff2www.york.ac.uk/static/2/fonts/Graph... https://www.york.ac.uk/static/2/fonts/Graphik-Semibold-Web.woff2 — 200 — 40.0 KiB — 20 ms — h2https://www.york.ac.uk/static/2/fonts/YorkGrot_SemiBoldCondensed_v2.10.woff2www.york.ac.uk/static/2/fonts/YorkG... https://www.york.ac.uk/static/2/fonts/YorkGrot_SemiBoldCondensed_v2.10.woff2 — 200 — 38.4 KiB — 24 ms — h2https://www.york.ac.uk/static/2/js/loader.jswww.york.ac.uk/static/2/js/loader.j... https://www.york.ac.uk/static/2/js/loader.js — 200 — 2.4 KiB — 49 ms — h2https://www.york.ac.uk/static/2/js/icons.jswww.york.ac.uk/static/2/js/icons.js https://www.york.ac.uk/static/2/js/icons.js — 200 — 1.2 KiB — 80 ms — h2https://www.york.ac.uk/static/2/fonts/bundle.csswww.york.ac.uk/static/2/fonts/bundl... https://www.york.ac.uk/static/2/fonts/bundle.css — 200 — 371 B — 56 ms — h2https://www.york.ac.uk/static/2/css/base.csswww.york.ac.uk/static/2/css/base.cs... https://www.york.ac.uk/static/2/css/base.css — 200 — 14.8 KiB — 59 ms — h2https://www.york.ac.uk/static/2/css/themes/uoy.theme.csswww.york.ac.uk/static/2/css/themes/... https://www.york.ac.uk/static/2/css/themes/uoy.theme.css — 200 — 1.1 KiB — 19 ms — h2https://www.york.ac.uk/static/2/images/uoy_logo_white.svgwww.york.ac.uk/static/2/images/uoy_... https://www.york.ac.uk/static/2/images/uoy_logo_white.svg — 200 — 7.0 KiB — 23 ms — h2https://www.york.ac.uk/static/data/homepage/images/UG%20Open%20Day.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/UG%20Open%20Day.jpg — 200 — 296.2 KiB — 74 ms — h2https://www.york.ac.uk/static/data/homepage/images/PG%20bridge%20840%20jpg.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/PG%20bridge%20840%20jpg.jpg — 200 — 138.3 KiB — 21 ms — h2https://www.york.ac.uk/static/2/manifest.jsonwww.york.ac.uk/static/2/manifest.js... https://www.york.ac.uk/static/2/manifest.json — 200 — 526 B — 651 ms — h2https://dev.visualwebsiteoptimizer.com/j.php?a=890923&u=https%3A%2F%2Fwww.york.ac.uk%2F&vn=2.1&x=truedev.visualwebsiteoptimizer.com/j.ph... https://dev.visualwebsiteoptimizer.com/j.php?a=890923&u=https%3A%2F%2Fwww.york.ac.uk%2F&vn=2.1&x=true — 200 — 13.1 KiB — 51 ms — h2https://www.york.ac.uk/static/globalalert/globalalert.jswww.york.ac.uk/static/globalalert/g... https://www.york.ac.uk/static/globalalert/globalalert.js — 200 — 1.2 KiB — 15 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-WXLX54www.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WXLX54 — 200 — 194.7 KiB — 308 ms — h2https://www.york.ac.uk/static/data/homepage/images/399-bio-cold-case.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/399-bio-cold-case.jpg — 200 — 36.6 KiB — 548 ms — h2https://www.york.ac.uk/static/data/homepage/images/399-borthwick-yorkshire.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/399-borthwick-yorkshire.jpg — 200 — 60.7 KiB — 632 ms — h2https://www.york.ac.uk/static/data/homepage/images/399-pollution.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/399-pollution.jpg — 200 — 43.9 KiB — 632 ms — h2https://www.york.ac.uk/static/data/homepage/images/Research%20story.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/Research%20story.jpg — 200 — 37.7 KiB — 629 ms — h2https://www.york.ac.uk/static/data/homepage/images/hes-hall-399.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/hes-hall-399.jpg — 200 — 24.4 KiB — 554 ms — h2https://www.york.ac.uk/static/data/homepage/images/Boundaries%20of%20love%20399.jpgwww.york.ac.uk/static/data/homepage... https://www.york.ac.uk/static/data/homepage/images/Boundaries%20of%20love%20399.jpg — 200 — 69.3 KiB — 619 ms — h2https://dev.visualwebsiteoptimizer.com/cdn/edrv/worker-57f1b8d94a5f9167e9bcdcf861046428.br.jsdev.visualwebsiteoptimizer.com/cdn/... https://dev.visualwebsiteoptimizer.com/cdn/edrv/worker-57f1b8d94a5f9167e9bcdcf861046428.br.js — 200 — 71.7 KiB — 189 ms — h3https://dev.visualwebsiteoptimizer.com/cdn/edrv/va_gq-d728c477f0f4777c8be7f1f120d0c70b.br.jsdev.visualwebsiteoptimizer.com/cdn/... https://dev.visualwebsiteoptimizer.com/cdn/edrv/va_gq-d728c477f0f4777c8be7f1f120d0c70b.br.js — 200 — 96.5 KiB — 219 ms — h3https://dev.visualwebsiteoptimizer.com/eu01/v.gif?cd=0&a=890923&d=york.ac.uk&u=DADD7792C10E40610EA76C8A12140A23F&h=a08cc99ef3c5cbb62abec72a5f7e60a6&t=falsedev.visualwebsiteoptimizer.com/eu01... https://dev.visualwebsiteoptimizer.com/eu01/v.gif?cd=0&a=890923&d=york.ac.uk&u=DADD7792C10E40610EA76C8A12140A23F&h=a08cc99ef3c5cbb62abec72a5f7e60a6&t=false — 200 — 147 B — 209 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/menu.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/menu.svg — 200 — 326 B — 70 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/close.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/close.svg — 200 — 439 B — 66 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/search.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/search.svg — 200 — 328 B — 76 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/close.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/close.svg — 200 — 0 B — 160 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 2.2 s LCP 5.7 shttps://york.ac.uk// https://york.ac.uk/ — 302 — 172 B — 732 ms — http/1.0https://www.york.ac.uk/www.york.ac.uk/ https://www.york.ac.uk/ — 200 — 10.8 KiB — 40 ms — h2https://www.york.ac.uk/static/2/fonts/Graphik-Regular-Web.woff2www.york.ac.uk/static/2/fonts/Graph... https://www.york.ac.uk/static/2/fonts/Graphik-Regular-Web.woff2 — 200 — 35.9 KiB — 15 ms — h2https://www.york.ac.uk/static/2/fonts/Graphik-Semibold-Web.woff2www.york.ac.uk/static/2/fonts/Graph... https://www.york.ac.uk/static/2/fonts/Graphik-Semibold-Web.woff2 — 200 — 40.0 KiB — 20 ms — h2https://www.york.ac.uk/static/2/fonts/YorkGrot_SemiBoldCondensed_v2.10.woff2www.york.ac.uk/static/2/fonts/YorkG... https://www.york.ac.uk/static/2/fonts/YorkGrot_SemiBoldCondensed_v2.10.woff2 — 200 — 38.4 KiB — 24 ms — h2https://www.york.ac.uk/static/2/js/loader.jswww.york.ac.uk/static/2/js/loader.j... https://www.york.ac.uk/static/2/js/loader.js — 200 — 2.4 KiB — 49 ms — 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h2https://www.york.ac.uk/static/2/images/icons/theme/left.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/left.svg — 200 — 0 B — 72 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/down.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/down.svg — 200 — 0 B — 69 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right.svg — 200 — 0 B — 71 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/up.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/up.svg — 200 — 0 B — 71 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/left.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/left.svg — 200 — 0 B — 76 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/down.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/down.svg — 200 — 0 B — 75 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right.svg — 200 — 0 B — 77 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/up.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/up.svg — 200 — 0 B — 73 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/left.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/left.svg — 200 — 0 B — 84 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/down.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/down.svg — 200 — 0 B — 80 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right.svg — 200 — 0 B — 83 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/up.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/up.svg — 200 — 0 B — 83 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/left.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/left.svg — 200 — 0 B — 92 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svg — 200 — 0 B — 61 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svg — 200 — 0 B — 78 ms — h2https://www.york.ac.uk/static/2/images/icons/globe.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/globe.svg — 200 — 0 B — 69 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/down.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/down.svg — 200 — 0 B — 88 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right.svg — 200 — 0 B — 90 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/up.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/up.svg — 200 — 0 B — 90 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/left.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/left.svg — 200 — 0 B — 95 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svg — 200 — 0 B — 87 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svg — 200 — 0 B — 92 ms — h2https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/theme/right_disc.svg — 200 — 0 B — 94 ms — h2https://www.york.ac.uk/static/2/images/icons/solid/magnifying-glass.svgwww.york.ac.uk/static/2/images/icon... https://www.york.ac.uk/static/2/images/icons/solid/magnifying-glass.svg — 200 — 0 B — 58 ms — h2https://dev.visualwebsiteoptimizer.com/dcdn/settings.js?a=890923&settings_type=4&ts=1776790816&dt=mobile&cc=USdev.visualwebsiteoptimizer.com/dcdn... https://dev.visualwebsiteoptimizer.com/dcdn/settings.js?a=890923&settings_type=4&ts=1776790816&dt=mobile&cc=US — 200 — 16.8 KiB — 134 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 — 65 ms — h3https://www.googletagmanager.com/gtag/js?id=AW-16952590477&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-16952590477&cx=c&gtm=4e64h1 — 200 — 144.7 KiB — 80 ms — h2https://www.googletagmanager.com/gtag/js?id=DC-11919936&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=DC-11919936&cx=c&gtm=4e64h1 — 200 — 129.4 KiB — 75 ms — h2https://www.googletagmanager.com/gtag/js?id=G-0E2CPWLEXN&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-0E2CPWLEXN&cx=c&gtm=4e64h1 — 200 — 170.3 KiB — 76 ms — h3https://script.crazyegg.com/pages/scripts/0018/9913.jsscript.crazyegg.com/pages/scripts/0... https://script.crazyegg.com/pages/scripts/0018/9913.js — 200 — 2.7 KiB — 30 ms — h3https://script.crazyegg.com/pages/data-scripts/0018/9913/site/www.york.ac.uk.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0018/9913/site/www.york.ac.uk.json?t=1 — 200 — 2.4 KiB — 18 ms — h3https://apikeys.civiccomputing.com/c/v?d=www.york.ac.uk&p=CookieControl%20Multi-Site&v=9&k=321eda7ad3a529e324ae977699903d996f0f4d6a&format=jsonapikeys.civiccomputing.com/c/v?d=ww... https://apikeys.civiccomputing.com/c/v?d=www.york.ac.uk&p=CookieControl%20Multi-Site&v=9&k=321eda7ad3a529e324ae977699903d996f0f4d6a&format=json — 200 — 633 B — 174 ms — h3https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.jsscript.crazyegg.com/pages/versioned... https://script.crazyegg.com/pages/versioned/common-scripts/4ce8c7df8d425cc50464576824ed91eb.js — 200 — 55.3 KiB — 18 ms — h3https://script.crazyegg.com/pages/data-scripts/0018/9913/sampling/www.york.ac.uk.json?t=1script.crazyegg.com/pages/data-scri... https://script.crazyegg.com/pages/data-scripts/0018/9913/sampling/www.york.ac.uk.json?t=1 — 200 — 381 B — 15 ms — h3https://tracking.crazyegg.com/clock?u=189913&st=102293&t=1776810295457&tk=4f21b83c4d9f8a8eee0e1909ec1aee49tracking.crazyegg.com/clock?u=18991... https://tracking.crazyegg.com/clock?u=189913&st=102293&t=1776810295457&tk=4f21b83c4d9f8a8eee0e1909ec1aee49 — 204 — 0 B — 32 ms — h2https://www.york.ac.uk/static/2/images/favicons/favicon.svgwww.york.ac.uk/static/2/images/favi... https://www.york.ac.uk/static/2/images/favicons/favicon.svg — 200 — 2.8 KiB — 543 ms — h2https://tracking.crazyegg.com/clock?u=189913&st=102293&t=1776810295457&tk=4f21b83c4d9f8a8eee0e1909ec1aee49tracking.crazyegg.com/clock?u=18991... https://tracking.crazyegg.com/clock?u=189913&st=102293&t=1776810295457&tk=4f21b83c4d9f8a8eee0e1909ec1aee49 — 200 — 144 B — 19 ms — h2https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.jsscript.crazyegg.com/pages/versioned... https://script.crazyegg.com/pages/versioned/tracking-scripts/158692313dc4b9f2e28d9e9025e38d6b.js — 200 — 22.6 KiB — 14 ms — h3https://www.google-analytics.com/g/collect?v=2&tid=G-0E2CPWLEXN&gtm=45je64h1v878088866z871602698za20gzb71602698zd71602698&_p=1776810294028&gcs=G101&gcd=13p3t3p3p5l1&npa=1&dma_cps=-&dma=0&gdid=dMDAwNW&are=1&cid=1180018737.1776810296&frm=0&pscdl=denied&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401&sid=1776810295&sct=1&seg=0&dl=https%3A%2F%2Fwww.york.ac.uk%2F&dt=University%20of%20York&_tu=KA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.content_group=Homepage&ep.page_layout_type=DPL&tfd=2700www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-0E2CPWLEXN&gtm=45je64h1v878088866z871602698za20gzb71602698zd71602698&_p=1776810294028&gcs=G101&gcd=13p3t3p3p5l1&npa=1&dma_cps=-&dma=0&gdid=dMDAwNW&are=1&cid=1180018737.1776810296&frm=0&pscdl=denied&rcb=2&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938468~117266401&sid=1776810295&sct=1&seg=0&dl=https%3A%2F%2Fwww.york.ac.uk%2F&dt=University%20of%20York&_tu=KA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.content_group=Homepage&ep.page_layout_type=DPL&tfd=2700 — 204 — 549 B — 53 ms — h2https://pagead2.googlesyndication.com/ccm/collect?rcb=7&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.york.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1261914327.1776810296&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dMDAwNW&gtm=45He64h1v71602698za200zd71602698xea&gcs=G101&gcd=13p3t3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938468~117266400~117384406~118463261&apve=1&apvf=f&apvc=1&tft=1776810295910&tfd=2744pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=7&frm=0&ae=g&en=page_view&dl=https%3A%2F%2Fwww.york.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1261914327.1776810296&navt=n&npa=1&ep.ads_data_redaction=0&gdid=dMDAwNW&gtm=45He64h1v71602698za200zd71602698xea&gcs=G101&gcd=13p3t3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938468~117266400~117384406~118463261&apve=1&apvf=f&apvc=1&tft=1776810295910&tfd=2744 — 200 — 21 B — 53 ms — h3https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&en=page_view&dl=https%3A%2F%2Fwww.york.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1261914327.1776810296&navt=n&npa=1&gdid=dMDAwNW&_tu=KA&gtm=45fe64h1v9188134638z871602698za20gzb71602698zd71602698xec&gcs=G101&gcd=13p3t3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938468~117266401&apve=1&apvf=f&apvc=0&tids=DC-11919936&tid=DC-11919936&tft=1776810295911&tfd=2746pagead2.googlesyndication.com/ccm/c... https://pagead2.googlesyndication.com/ccm/collect?rcb=17&frm=0&en=page_view&dl=https%3A%2F%2Fwww.york.ac.uk%2F&scrsrc=www.googletagmanager.com&rnd=1261914327.1776810296&navt=n&npa=1&gdid=dMDAwNW&_tu=KA&gtm=45fe64h1v9188134638z871602698za20gzb71602698zd71602698xec&gcs=G101&gcd=13p3t3p3p5l1&dma_cps=-&dma=0&tag_exp=0~115938466~115938468~117266401&apve=1&apvf=f&apvc=0&tids=DC-11919936&tid=DC-11919936&tft=1776810295911&tfd=2746 — 200 — 21 B — 51 ms — h3https://ade.googlesyndication.com/ddm/activity/src=11919936;type=conve0;cat=nn-fl0;rcb=17;ord=1;num=6350282013157;npa=1;u1=%2F;gdid=dMDAwNW;uaa=;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=denied;frm=0;_tu=AJA;gtm=45fe64h1v9188134638z871602698za20gzb71602698zd71602698xea;gcs=G101;gcd=13p3t3p3p5l1;dma_cps=-;dma=0;dc_fmt=8;tag_exp=0~115938466~115938468~117266401;epver=2;~oref=https%3A%2F%2Fwww.york.ac.uk%2F?ade.googlesyndication.com/ddm/activ... https://ade.googlesyndication.com/ddm/activity/src=11919936;type=conve0;cat=nn-fl0;rcb=17;ord=1;num=6350282013157;npa=1;u1=%2F;gdid=dMDAwNW;uaa=;uab=64;uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164;uamb=1;uam=moto%20g%20power%20(2022);uap=Android;uapv=11.0;uaw=0;pscdl=denied;frm=0;_tu=AJA;gtm=45fe64h1v9188134638z871602698za20gzb71602698zd71602698xea;gcs=G101;gcd=13p3t3p3p5l1;dma_cps=-;dma=0;dc_fmt=8;tag_exp=0~115938466~115938468~117266401;epver=2;~oref=https%3A%2F%2Fwww.york.ac.uk%2F? — 200 — 401 B — 63 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 6418ms · 855KB · £67/mo
www.york.ac.uk
Other
Costly
Execution 2502ms
Transfer 11 KB
Monthly Cost £26/mo
Unattributable
Other
Costly
Execution 1160ms
Transfer 0 KB
Monthly Cost £12/mo
Google Tag Manager
Tag Manager
Costly
Execution 897ms
Transfer 195 KB
Unused 25%
Monthly Cost £9/mo
Google Tag Manager
Tag Manager
Costly
Execution 566ms
Transfer 170 KB
Unused 39%
Monthly Cost £6/mo
cc.cdn.civiccomputing.com
Other
Costly
Execution 298ms
Transfer 123 KB
Unused 45%
Monthly Cost £3/mo
script.crazyegg.com
Other
Costly
Execution 279ms
Transfer 55 KB
Unused 56%
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Optional
Execution 191ms
Transfer 129 KB
Unused 46%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 187ms
Transfer 145 KB
Unused 45%
Monthly Cost £2/mo
www.york.ac.uk
Other
Optional
Execution 170ms
Transfer 1 KB
Monthly Cost £2/mo
script.crazyegg.com
Other
Optional
Execution 95ms
Transfer 23 KB
Monthly Cost £1/mo
www.york.ac.uk
Other
Optional
Execution 71ms
Transfer 2 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.york.ac.uk adds 2502ms and costs ~£26/month
  • Unattributable adds 1160ms and costs ~£12/month
  • Google Tag Manager adds 897ms and costs ~£9/month
  • Google Tag Manager adds 566ms and costs ~£6/month
  • cc.cdn.civiccomputing.com adds 298ms and costs ~£3/month
  • script.crazyegg.com adds 279ms 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.york.ac.uk takes 2502ms 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 1160ms 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 897ms 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 566ms 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 298ms 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

script.crazyegg.com takes 279ms 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 script.crazyegg.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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