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https://nottingham.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
75
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
73
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
92
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.
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.

1.97 s

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

2.88 s

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

86 ms

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

0.013

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

1.97 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.

2.88 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
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
4.8 MB transferred, 69 requests
FIX
4.8 MB transferred, 69 requests
Critical::
Page weighs 11.9 MB (4.8 MB transferred)
Warning::
Images are 3.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 3.3 MB
Warning::
JavaScript is 767 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 767 KB
Info::
Fonts are 457 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 457 KB
Info::
69 HTTP requests
Info::
Estimated 1.00 g CO2 per page load
4.8 MB / 2.4 MB budget
4.8 MB transferred
69 requests
1.00 g CO2 per page load
Images 3.3 MiB 70%
JavaScript 767.0 KiB 16%
Fonts 457.4 KiB 9%
CSS 108.1 KiB 2%
HTML 93.2 KiB 2%
Other 47.7 KiB 1%
Other 2.5 KiB 0%
Other 1.7 KiB 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

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 (4.8 MiB of 4.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
69 resources · 4.8 MB · 62 KB savings available
FIX
69 resources · 4.8 MB · 62 KB savings available
Warning::
Page weight 3.8 MB over 1MB target
Got: 4.8 MB Expected: ≤ 1 MB
Info::
~62 KB of savings available
Warning::
68 third-party resources (100% of weight)
Info::
7 resources over 200KB
69 resources · 4.8 MiB · 68 third-party 3.8 MiB over 1MB target
Image 70% · 3.3 MiB
JavaScript 16% · 793.9 KiB
Font 9% · 457.4 KiB
CSS 2% · 112.5 KiB
Document 2% · 93.2 KiB
Other 0% · 18.6 KiB

~62.2 KiB of savings available

Remove unused JavaScript: 62.2 KiB
C
Image Optimization
Action
24 images, 0 KB saveable
REVIEW
24 images, 0 KB saveable
Warning::
https://www.nottingham.ac.uk/Homepage-2021/Images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nottingham.ac.uk/Homepage-2021/Images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nottingham.ac.uk/Homepage-2021/Images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.nottingham.ac.uk/Homepage-2021/Images/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
24 images 3.3 MB
0 oversized -0 KB
24 legacy format
4 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

B
JS Execution Cost
728ms total JS execution
REVIEW
728ms total JS execution
Warning::
https://cdn-ukwest.onetrust.com/consent/8d94c393-e...: 365ms CPU time
Info::
https://www.nottingham.ac.uk/: 182ms CPU time
Info::
Unattributable: 111ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 70ms CPU time
Warning::
Third-party scripts: 728ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 17% Script Parsing & Compilation 16% Style & Layout 12% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://cdn-ukwest.onetrust.com/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js365ms243ms112ms3rd
https://www.nottingham.ac.uk/182ms19ms2ms3rd
Unattributable111ms15ms0ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js70ms50ms8ms3rd
B
JS Bundles
15 scripts, 62 KB unused
REVIEW
15 scripts, 62 KB unused
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 62 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 62 KB
62 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js116 KB62 KB (54%)✓3rd
https://www.nottingham.ac.uk/SiteElements/Javascript/gecko-cookie.js1 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/js/modaal.min.js5 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js560 KB—✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js9 KB—✓3rd
https://www.nottingham.ac.uk/SiteElements/Javascript/aadatalayer.js3 KB—✓3rd
https://www.nottingham.ac.uk/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVAzF2AgEiZAQn_RB8q1D-OpipawIamHu-r6UwDtePXpIVa2V6pnJ_gcL_OhkiR9WkXq50FLfVzbD0&t=639039886149830248&build=17115433 KB—✓3rd
https://www.nottingham.ac.uk/SiteElements/Javascript/gecko-form.js1 KB—✓3rd
https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.js?build=17115410 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/8d94c393-ee7d-4ad5-95e8-bc88408adffd.json2 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

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
7 fonts (457 KB)
PASS
7 fonts (457 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

457 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 1.0 s 2.0 s 3.0 s FCP 2.0 s LCP 2.9 shttps://cdn-uon-live.nottingham.ac.uk/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/fonts/CircularXX/CircularXX-Regular.woff2CircularXX-Regular.woff2 https://cdn-uon-live.nottingham.ac.uk/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/fonts/CircularXX/CircularXX-Regular.woff2 — 35.2 KiB — 18 ms — font-display: swaphttps://www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lora/Lora-Bold.woffLora-Bold.woff https://www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lora/Lora-Bold.woff — 86.5 KiB — 37 ms — font-display: swaphttps://www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lineto-circular-pro-bold-woff.wofflineto-circular-pro-bol... https://www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lineto-circular-pro-bold-woff.woff — 91.4 KiB — 35 ms — font-display: swaphttps://cdn-uon-live.nottingham.ac.uk/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/fonts/Lora/Lora-Regular.woff2Lora-Regular.woff2 https://cdn-uon-live.nottingham.ac.uk/etc.clientlibs/uon/clientlibs/clientlib-v2/resources/fonts/Lora/Lora-Regular.woff2 — 46.7 KiB — 6 ms — font-display: swaphttps://www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lineto-circular-pro-medium-woff.wofflineto-circular-pro-med... https://www.nottingham.ac.uk/SiteElementsHomepage/css/fonts/lineto-circular-pro-medium-woff.woff — 87.9 KiB — 35 ms — font-display: swaphttps://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/fonts/slick.woffslick.woff https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/fonts/slick.woff — 1.7 KiB — 4 ms — font-display: swaphttps://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/webfonts/fa-brands-400.woff2 — 107.9 KiB — 82 ms — font-display: swap
CircularXX-Regular.woff2 woff2 swap
Size 35 KB
Load time 18 ms
Start 528 ms
Risk FOUT — text flashes from fallback to web font
Lora-Bold.woff woff swap
Size 87 KB
Load time 37 ms
Start 582 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lineto-circular-pro-bol... woff swap
Size 91 KB
Load time 35 ms
Start 595 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Lora-Regular.woff2 woff2 swap
Size 47 KB
Load time 6 ms
Start 595 ms
Risk FOUT — text flashes from fallback to web font
lineto-circular-pro-med... woff swap
Size 88 KB
Load time 35 ms
Start 640 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
slick.woff woff swap
Size 2 KB
Load time 4 ms
Start 765 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
fa-brands-400.woff2 woff2 swap
Size 108 KB
Load time 82 ms
Start 850 ms
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
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 ~134 KB and ~268 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Zengenti

Network Waterfall
69 requests over 1097ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 2.0 s LCP 2.9 shttps://nottingham.ac.uk// https://nottingham.ac.uk/ — 302 — 111 B — 97 ms — h2https://www.nottingham.ac.uk/www.nottingham.ac.uk/ https://www.nottingham.ac.uk/ — 200 — 93.2 KiB — 96 ms — h2https://www.nottingham.ac.uk/siteelements/stylesheets/2022/global-2022.css?version=9588465www.nottingham.ac.uk/siteelements/s... https://www.nottingham.ac.uk/siteelements/stylesheets/2022/global-2022.css?version=9588465 — 200 — 28.2 KiB — 87 ms — h2https://www.nottingham.ac.uk/siteelements/stylesheets/2022/responsive-2022.css?version=9583845www.nottingham.ac.uk/siteelements/s... https://www.nottingham.ac.uk/siteelements/stylesheets/2022/responsive-2022.css?version=9583845 — 200 — 6.5 KiB — 83 ms — h2https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.csscdn.jsdelivr.net/npm/bootstrap@5.0.... https://cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css — 200 — 25.2 KiB — 19 ms — h2https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.csscdnjs.cloudflare.com/ajax/libs/font... https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css — 200 — 19.0 KiB — 68 ms — h3https://www.nottingham.ac.uk/homepage-2021/stylesheets/style.css?version=9578931www.nottingham.ac.uk/homepage-2021/... https://www.nottingham.ac.uk/homepage-2021/stylesheets/style.css?version=9578931 — 200 — 2.5 KiB — 83 ms — h2https://cdn-uon-live.nottingham.ac.uk/etc.clientlibs/uon/clientlibs/clientlib-headerv2.min.csscdn-uon-live.nottingham.ac.uk/etc.c... https://cdn-uon-live.nottingham.ac.uk/etc.clientlibs/uon/clientlibs/clientlib-headerv2.min.css — 200 — 6.5 KiB — 22 ms — h2https://www.nottingham.ac.uk/Homepage-2021/Stylesheets/header-v2.css?version=9632927www.nottingham.ac.uk/Homepage-2021/... https://www.nottingham.ac.uk/Homepage-2021/Stylesheets/header-v2.css?version=9632927 — 200 — 1.0 KiB — 84 ms — h2https://www.nottingham.ac.uk/Homepage-2021/Stylesheets/homepage-2024.css?version=9627499www.nottingham.ac.uk/Homepage-2021/... https://www.nottingham.ac.uk/Homepage-2021/Stylesheets/homepage-2024.css?version=9627499 — 200 — 4.6 KiB — 86 ms — h2https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.csscdn.jsdelivr.net/npm/@accessible360... https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.css — 200 — 543 B — 14 ms — h2https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/accessible-slick-theme.min.csscdn.jsdelivr.net/npm/@accessible360... https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/accessible-slick-theme.min.css — 200 — 1.2 KiB — 12 ms — h2https://www.nottingham.ac.uk/Homepage-2021/Stylesheets/footer.css?version=9549158www.nottingham.ac.uk/Homepage-2021/... https://www.nottingham.ac.uk/Homepage-2021/Stylesheets/footer.css?version=9549158 — 200 — 2.2 KiB — 85 ms — h2https://www.nottingham.ac.uk/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVAzF2AgEiZAQn_RB8q1D-OpipawIamHu-r6UwDtePXpIVa2V6pnJ_gcL_OhkiR9WkXq50FLfVzbD0&t=639039886149830248&build=171154www.nottingham.ac.uk/WebResource.ax... https://www.nottingham.ac.uk/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVAzF2AgEiZAQn_RB8q1D-OpipawIamHu-r6UwDtePXpIVa2V6pnJ_gcL_OhkiR9WkXq50FLfVzbD0&t=639039886149830248&build=171154 — 200 — 32.7 KiB — 103 ms — h2https://www.nottingham.ac.uk/SiteElementsHomepage/js/search-web-resource.js?renew=1&version=9073817&build=171154www.nottingham.ac.uk/SiteElementsHo... https://www.nottingham.ac.uk/SiteElementsHomepage/js/search-web-resource.js?renew=1&version=9073817&build=171154 — 200 — 961 B — 86 ms — h2https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.js?build=171154cdn.jsdelivr.net/npm/@accessible360... https://cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.js?build=171154 — 200 — 9.9 KiB — 14 ms — h2https://cdn-ukwest.onetrust.com/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.jscdn-ukwest.onetrust.com/consent/8d9... https://cdn-ukwest.onetrust.com/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js — 200 — 559.9 KiB — 154 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.jscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js — 200 — 9.1 KiB — 91 ms — h2https://www.nottingham.ac.uk/SiteElements/Javascript/aadatalayer.jswww.nottingham.ac.uk/SiteElements/J... https://www.nottingham.ac.uk/SiteElements/Javascript/aadatalayer.js — 200 — 2.7 KiB — 92 ms — h2https://www.nottingham.ac.uk/SiteElements/Javascript/gecko-cookie.jswww.nottingham.ac.uk/SiteElements/J... https://www.nottingham.ac.uk/SiteElements/Javascript/gecko-cookie.js — 200 — 903 B — 93 ms — h2https://www.nottingham.ac.uk/SiteElements/Javascript/gecko-form.jswww.nottingham.ac.uk/SiteElements/J... https://www.nottingham.ac.uk/SiteElements/Javascript/gecko-form.js — 200 — 1.1 KiB — 93 ms — h2https://fonts.googleapis.com/icon?family=Material+Iconsfonts.googleapis.com/icon?family=Ma... https://fonts.googleapis.com/icon?family=Material+Icons — 200 — 817 B — 76 ms — h2https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/css/modaal.min.csscdnjs.cloudflare.com/ajax/libs/Moda... https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/css/modaal.min.css — 200 — 2.5 KiB — 38 ms — h3https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/js/modaal.min.jscdnjs.cloudflare.com/ajax/libs/Moda... https://cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/js/modaal.min.js — 200 — 5.2 KiB — 48 ms — h3https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.cssmaxcdn.bootstrapcdn.com/font-awesom... https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css — 200 — 7.4 KiB — 53 ms — h3https://www.nottingham.ac.uk/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World/Mobile/students-smiling-mobile.x3c389659.jpgwww.nottingham.ac.uk/Homepage-2021/... https://www.nottingham.ac.uk/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World/Mobile/students-smiling-mobile.x3c389659.jpg — 200 — 426.1 KiB — 83 ms — h2https://www.nottingham.ac.uk/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World/Desktop/students-smiling-desktop.x18051b15.jpgwww.nottingham.ac.uk/Homepage-2021/... https://www.nottingham.ac.uk/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World/Desktop/students-smiling-desktop.x18051b15.jpg — 200 — 610.0 KiB — 114 ms — h2https://www.nottingham.ac.uk/Homepage-2021/Images/Tiles/Microscope.xc38aa90b.jpg?w=800&h=532&crop=800,400,0,76www.nottingham.ac.uk/Homepage-2021/... https://www.nottingham.ac.uk/Homepage-2021/Images/Tiles/Microscope.xc38aa90b.jpg?w=800&h=532&crop=800,400,0,76 — 200 — 51.3 KiB — 44 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 728ms · 769KB · £8/mo
cdn-ukwest.onetrust.com
Other
Costly
Execution 365ms
Transfer 560 KB
Monthly Cost £4/mo
www.nottingham.ac.uk
Other
Optional
Execution 182ms
Transfer 93 KB
Monthly Cost £2/mo
Unattributable
Other
Optional
Execution 111ms
Transfer 0 KB
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 70ms
Transfer 116 KB
Unused 54%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • cdn-ukwest.onetrust.com adds 365ms 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

cdn-ukwest.onetrust.com takes 365ms 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

54% of cdn-ukwest.onetrust.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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