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https://sheffield.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
83
GRADE
B
FIX
2
REVIEW
4
PASS
7
INFO
2

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

Mobile Desktop
92
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.
96
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.

970 ms

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

1.55 s

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

0 ms

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

0.002

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

1.32 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.

1.55 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
7 PASS 4 REVIEW 2 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 51 requests
FIX
2.5 MB transferred, 51 requests
Warning::
Page weighs 3.9 MB (2.5 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Info::
Fonts are 362 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 362 KB
Info::
51 HTTP requests
Info::
Estimated 0.51 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
51 requests
0.51 g CO2 per page load
Images 1.7 MiB 68%
Fonts 362.0 KiB 14%
JavaScript 290.1 KiB 12%
CSS 59.8 KiB 2%
Other 44.5 KiB 2%
HTML 24.4 KiB 1%
Other 22.4 KiB 1%
Other 2.6 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

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
Page Weight Inventory
Action
51 resources · 2.5 MB · 142 KB savings available
FIX
51 resources · 2.5 MB · 142 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~142 KB of savings available
Warning::
30 third-party resources (41% of weight)
Info::
2 resources over 200KB
51 resources · 2.5 MiB · 30 third-party 1.5 MiB over 1MB target
Image 69% · 1.7 MiB
Font 14% · 362.0 KiB
JavaScript 13% · 315.6 KiB
CSS 3% · 64.4 KiB
Document 1% · 24.4 KiB
Other 1% · 16.5 KiB

~141.6 KiB of savings available

Remove unused JavaScript: 141.6 KiB
B
Third-Party Impact
41% third-party, 0 ms blocking
REVIEW
41% third-party, 0 ms blocking
Info::
Third-party code accounts for 41% of page weight (1017.6 KiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
59%
41%
First-party Third-party
B
Image Optimization
27 images, 0 KB saveable
REVIEW
27 images, 0 KB saveable
Warning::
https://sheffield.ac.uk/themes/custom/uos_public/i... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
27 images 1.7 MB
0 oversized -0 KB
26 legacy format
1 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

B
JS Bundles
7 scripts, 142 KB unused
REVIEW
7 scripts, 142 KB unused
Warning::
https://cdn.sheffield.ac.uk/sites/default/files/js...: 74 KB unused (53%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 67 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 142 KB
142 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdn.sheffield.ac.uk/sites/default/files/js/js_jp6Lz0rnhBXaGt8cRu-KthubP_qJo3NPhvqQHjM6Kpo.js?scope=footer&delta=0&language=en&theme=uos_public&include=eJxNjEEKgDAMBD9U7JNCm0ap1q7G5KCvFxHE28wchhcp1aCUmKGlosePhlHRTXoJ8-6iJ3ml5AbGujUxiX8JjoM2z61ynBpyauFyzTTCe0n2jN98A0vELbc140 KB74 KB (53%)✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/otBannerSdk.js124 KB67 KB (54%)✓3rd
https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/OtAutoBlock.js17 KB—✓3rd
https://cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js9 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/a3110129-5f04-4e81-9c5e-b494a7836315.json2 KB—✓3rd
https://cdn.sheffield.ac.uk/sites/default/files/google_tag/primary/google_tag.script.js?tdkxqj1 KB—✓3rd
https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/164daec9-03f9-4ee5-a84f-63820efdac36/en.json23 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+
JS Execution Cost
341ms total JS execution
PASS
341ms total JS execution
Info::
https://sheffield.ac.uk/: 104ms CPU time
Info::
Unattributable: 94ms CPU time
Info::
https://cdn.sheffield.ac.uk/sites/default/files/js...: 87ms CPU time
Info::
https://cdn-ukwest.onetrust.com/scripttemplates/20...: 56ms CPU time
Warning::
Third-party scripts: 237ms (69% of total)

Main Thread Breakdown

Script Evaluation 35% Other 25% Style & Layout 24% Script Parsing & Compilation 6% Parse HTML & CSS 5% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://sheffield.ac.uk/104ms1ms0ms1st
Unattributable94ms12ms0ms3rd
https://cdn.sheffield.ac.uk/sites/default/files/js/js_jp6Lz0rnhBXaGt8cRu-KthubP_qJo3NPhvqQHjM6Kpo.js?scope=footer&delta=0&language=en&theme=uos_public&include=eJxNjEEKgDAMBD9U7JNCm0ap1q7G5KCvFxHE28wchhcp1aCUmKGlosePhlHRTXoJ8-6iJ3ml5AbGujUxiX8JjoM2z61ynBpyauFyzTTCe0n2jN98A0vELbc87ms57ms9ms3rd
https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/otBannerSdk.js56ms39ms10ms3rd
A+
Font Loading
6 fonts (362 KB)
PASS
6 fonts (362 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

362 KB total

Render-blocking

0

of 6

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 FCP 970 ms LCP 1.5 shttps://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-sans-3-v15-latin-regular.woff2source-sans-3-v15-latin... https://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-sans-3-v15-latin-regular.woff2 — 15.4 KiB — 7 ms — font-display: swaphttps://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-sans-3-v15-latin-700.woff2source-sans-3-v15-latin... https://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-sans-3-v15-latin-700.woff2 — 15.3 KiB — 19 ms — font-display: swaphttps://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-serif-4-v8-latin-700.woff2source-serif-4-v8-latin... https://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-serif-4-v8-latin-700.woff2 — 21.7 KiB — 5 ms — font-display: swaphttps://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-sans-3-v15-latin-900.woff2source-sans-3-v15-latin... https://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/source-sans-3-v15-latin-900.woff2 — 14.6 KiB — 11 ms — font-display: swaphttps://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/HotMess.ttfHotMess.ttf https://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/HotMess.ttf — 214.9 KiB — 25 ms — font-display: swaphttps://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/SourceSerif4Roman-Regular.woff2SourceSerif4Roman-Regul... https://cdn.sheffield.ac.uk/themes/custom/common/uos/fonts/SourceSerif4Roman-Regular.woff2 — 80.2 KiB — 13 ms — font-display: swap
source-sans-3-v15-latin... woff2 swap
Size 15 KB
Load time 7 ms
Start 312 ms
Risk FOUT — text flashes from fallback to web font
source-sans-3-v15-latin... woff2 swap
Size 15 KB
Load time 19 ms
Start 312 ms
Risk FOUT — text flashes from fallback to web font
source-serif-4-v8-latin... woff2 swap
Size 22 KB
Load time 5 ms
Start 312 ms
Risk FOUT — text flashes from fallback to web font
source-sans-3-v15-latin... woff2 swap
Size 15 KB
Load time 11 ms
Start 312 ms
Risk FOUT — text flashes from fallback to web font
HotMess.ttf ttf swap
Size 215 KB
Load time 25 ms
Start 312 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
SourceSerif4Roman-Regul... woff2 swap
Size 80 KB
Load time 13 ms
Start 314 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)

Fixing the unchecked items could save ~172 KB and ~344 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+
HTTP Caching
max-age=900 (15 minutes)
PASS
max-age=900 (15 minutes)
Info::
Cache-Control header is set
Got: max-age=900, public, s-maxage=604800
Info::
Effective TTL: 15 minutes (max-age=900)
Info::
CDN TTL: 1 week (s-maxage=604800)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=900, public, s-maxage=604800

DirectiveValueMeaning
max-age900Cache for 15 minutes
public—Any cache may store this response
s-maxage604800CDN caches for 1 week
Effective TTL: 900 seconds
Network Waterfall
51 requests over 716ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 970 ms LCP 1.5 shttps://sheffield.ac.uk// https://sheffield.ac.uk/ — 200 — 24.4 KiB — 160 ms — http/1.1https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/OtAutoBlock.jscdn-ukwest.onetrust.com/consent/a31... https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/OtAutoBlock.js — 200 — 16.8 KiB — 81 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 — 75 ms — h2https://cdn.sheffield.ac.uk/sites/default/files/css/css_LEqc-iG5QeVPDkBugYzgSyJGoZbo1OGkJByYYLXq8yE.css?delta=0&language=en&theme=uos_public&include=eJxNj2tuwzAMgy_kxkcSZFtptTmWq0eG7PRLg2HdH4H6SAlg_aTGLgpYq2hjGflPLavKcBot0XD2A2gr1HLF6aebPp5BekAwYLhU2WYnp_x_SR0PCYfGVmU_01kGVelpouJdcT4sN42JfXmTJcaM0tke1JKSTRnGO4Fj6QQrdyfNb367eLLDnLZc0CiFGFwvar53KdjTzvRl-ZrLJi3Og-_QAqvEaPiq85v8AQBhbFscdn.sheffield.ac.uk/sites/default/f... https://cdn.sheffield.ac.uk/sites/default/files/css/css_LEqc-iG5QeVPDkBugYzgSyJGoZbo1OGkJByYYLXq8yE.css?delta=0&language=en&theme=uos_public&include=eJxNj2tuwzAMgy_kxkcSZFtptTmWq0eG7PRLg2HdH4H6SAlg_aTGLgpYq2hjGflPLavKcBot0XD2A2gr1HLF6aebPp5BekAwYLhU2WYnp_x_SR0PCYfGVmU_01kGVelpouJdcT4sN42JfXmTJcaM0tke1JKSTRnGO4Fj6QQrdyfNb367eLLDnLZc0CiFGFwvar53KdjTzvRl-ZrLJi3Og-_QAqvEaPiq85v8AQBhbFs — 200 — 4.8 KiB — 9 ms — h2https://cdn.sheffield.ac.uk/sites/default/files/css/css_w--SeWAlIkBVWx_reufqqGwWA9X_xBWUqR8c39mhGdI.css?delta=1&language=en&theme=uos_public&include=eJxNj2tuwzAMgy_kxkcSZFtptTmWq0eG7PRLg2HdH4H6SAlg_aTGLgpYq2hjGflPLavKcBot0XD2A2gr1HLF6aebPp5BekAwYLhU2WYnp_x_SR0PCYfGVmU_01kGVelpouJdcT4sN42JfXmTJcaM0tke1JKSTRnGO4Fj6QQrdyfNb367eLLDnLZc0CiFGFwvar53KdjTzvRl-ZrLJi3Og-_QAqvEaPiq85v8AQBhbFscdn.sheffield.ac.uk/sites/default/f... https://cdn.sheffield.ac.uk/sites/default/files/css/css_w--SeWAlIkBVWx_reufqqGwWA9X_xBWUqR8c39mhGdI.css?delta=1&language=en&theme=uos_public&include=eJxNj2tuwzAMgy_kxkcSZFtptTmWq0eG7PRLg2HdH4H6SAlg_aTGLgpYq2hjGflPLavKcBot0XD2A2gr1HLF6aebPp5BekAwYLhU2WYnp_x_SR0PCYfGVmU_01kGVelpouJdcT4sN42JfXmTJcaM0tke1JKSTRnGO4Fj6QQrdyfNb367eLLDnLZc0CiFGFwvar53KdjTzvRl-ZrLJi3Og-_QAqvEaPiq85v8AQBhbFs — 200 — 55.0 KiB — 10 ms — h2https://sheffield.ac.uk/themes/custom/uos_public/images/logos/uos-crest.svg/themes/custom/uos_public/images/lo... https://sheffield.ac.uk/themes/custom/uos_public/images/logos/uos-crest.svg — 200 — 16.7 KiB — 46 ms — http/1.1https://sheffield.ac.uk/sites/default/files/styles/main_home/public/2026-03/Cover_v03_large%20%281%29.jpg?h=76294784&itok=WSJ0MgKy/sites/default/files/styles/main_ho... https://sheffield.ac.uk/sites/default/files/styles/main_home/public/2026-03/Cover_v03_large%20%281%29.jpg?h=76294784&itok=WSJ0MgKy — 200 — 207.0 KiB — 121 ms — http/1.1https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2026-03/Cover_v03_large%20%281%29.jpg?h=647c1a54&itok=rbLi0OJ4/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2026-03/Cover_v03_large%20%281%29.jpg?h=647c1a54&itok=rbLi0OJ4 — 200 — 96.6 KiB — 103 ms — http/1.1https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/a3110129-5f04-4e81-9c5e-b494a7836315.jsoncdn-ukwest.onetrust.com/consent/a31... https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/a3110129-5f04-4e81-9c5e-b494a7836315.json — 200 — 2.4 KiB — 82 ms — h2https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-02/economics_undergrads.jpg?h=7eb62d8e&itok=IFl3Oiqh/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-02/economics_undergrads.jpg?h=7eb62d8e&itok=IFl3Oiqh — 200 — 51.4 KiB — 89 ms — http/1.1https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2020-03/pgde-30564.jpg?h=82e026d0&itok=3FCRJWWD/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2020-03/pgde-30564.jpg?h=82e026d0&itok=3FCRJWWD — 200 — 44.4 KiB — 104 ms — http/1.1https://cdn.sheffield.ac.uk/sites/default/files/js/js_jp6Lz0rnhBXaGt8cRu-KthubP_qJo3NPhvqQHjM6Kpo.js?scope=footer&delta=0&language=en&theme=uos_public&include=eJxNjEEKgDAMBD9U7JNCm0ap1q7G5KCvFxHE28wchhcp1aCUmKGlosePhlHRTXoJ8-6iJ3ml5AbGujUxiX8JjoM2z61ynBpyauFyzTTCe0n2jN98A0vELbccdn.sheffield.ac.uk/sites/default/f... https://cdn.sheffield.ac.uk/sites/default/files/js/js_jp6Lz0rnhBXaGt8cRu-KthubP_qJo3NPhvqQHjM6Kpo.js?scope=footer&delta=0&language=en&theme=uos_public&include=eJxNjEEKgDAMBD9U7JNCm0ap1q7G5KCvFxHE28wchhcp1aCUmKGlosePhlHRTXoJ8-6iJ3ml5AbGujUxiX8JjoM2z61ynBpyauFyzTTCe0n2jN98A0vELbc — 200 — 139.7 KiB — 11 ms — h2https://cdn.sheffield.ac.uk/sites/default/files/google_tag/primary/google_tag.script.js?tdkxqjcdn.sheffield.ac.uk/sites/default/f... https://cdn.sheffield.ac.uk/sites/default/files/google_tag/primary/google_tag.script.js?tdkxqj — 200 — 541 B — 10 ms — h2https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-08/31306.jpg?h=97397f07&itok=UM-JWsnR/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-08/31306.jpg?h=97397f07&itok=UM-JWsnR — 200 — 56.3 KiB — 136 ms — http/1.1https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2022-09/GettyImages-932767346.jpg?h=b5e4e16b&itok=g756NRa1/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2022-09/GettyImages-932767346.jpg?h=b5e4e16b&itok=g756NRa1 — 200 — 60.0 KiB — 198 ms — 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http/1.1https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-04/light-blur-city-scape_0.jpg?h=b5941091&itok=ZcvXSFgY/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-04/light-blur-city-scape_0.jpg?h=b5941091&itok=ZcvXSFgY — 200 — 72.5 KiB — 51 ms — http/1.1https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/otBannerSdk.jscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/otBannerSdk.js — 200 — 124.1 KiB — 58 ms — h2https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-10/SheffieldCityView_0.jpg?h=b7adc06c&itok=pxtkuKkA/sites/default/files/styles/two_thi... https://sheffield.ac.uk/sites/default/files/styles/two_thirds_1x/public/2019-10/SheffieldCityView_0.jpg?h=b7adc06c&itok=pxtkuKkA — 200 — 83.0 KiB — 52 ms — http/1.1https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/164daec9-03f9-4ee5-a84f-63820efdac36/en.jsoncdn-ukwest.onetrust.com/consent/a31... https://cdn-ukwest.onetrust.com/consent/a3110129-5f04-4e81-9c5e-b494a7836315/164daec9-03f9-4ee5-a84f-63820efdac36/en.json — 200 — 23.1 KiB — 46 ms — h2https://sheffield.ac.uk/themes/custom/uos_public/favicon.svg/themes/custom/uos_public/favicon.s... https://sheffield.ac.uk/themes/custom/uos_public/favicon.svg — 200 — 10.0 KiB — 38 ms — http/1.1https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/assets/otFloatingFlat.jsoncdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/assets/otFloatingFlat.json — 200 — 3.1 KiB — 36 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/assets/v2/otPcCenter.jsoncdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/assets/v2/otPcCenter.json — 200 — 13.2 KiB — 44 ms — h2https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/assets/otCommonStyles.csscdn-ukwest.onetrust.com/scripttempl... https://cdn-ukwest.onetrust.com/scripttemplates/202510.2.0/assets/otCommonStyles.css — 200 — 4.6 KiB — 38 ms — h2https://sheffield.ac.uk/themes/custom/uos_public/favicon.ico/themes/custom/uos_public/favicon.i... https://sheffield.ac.uk/themes/custom/uos_public/favicon.ico — 200 — 12.4 KiB — 39 ms — http/1.1https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/ot_guard_logo.svg — 200 — 583 B — 36 ms — h2https://cdn-ukwest.onetrust.com/logos/3137c8ec-cd0f-432b-aee6-3e825379023a/a3110129-5f04-4e81-9c5e-b494a7836315/a2b907a4-ce8e-4508-a3f3-1ed482ec270d/logo-ot3.pngcdn-ukwest.onetrust.com/logos/3137c... https://cdn-ukwest.onetrust.com/logos/3137c8ec-cd0f-432b-aee6-3e825379023a/a3110129-5f04-4e81-9c5e-b494a7836315/a2b907a4-ce8e-4508-a3f3-1ed482ec270d/logo-ot3.png — 200 — 7.5 KiB — 35 ms — h2https://cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svgcdn-ukwest.onetrust.com/logos/stati... https://cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg — 200 — 2.5 KiB — 37 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
69% of JavaScript execution is third-party
First-party Third-party 237ms · 264KB · £2/mo
Unattributable
Other
Optional
Execution 94ms
Transfer 0 KB
Monthly Cost £1/mo
cdn.sheffield.ac.uk
Other
Optional
Execution 87ms
Transfer 140 KB
Unused 53%
Monthly Cost £1/mo
cdn-ukwest.onetrust.com
Other
Optional
Execution 56ms
Transfer 124 KB
Unused 54%
Monthly Cost £1/mo

69% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

53% of cdn.sheffield.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

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

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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