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https://liverpool.ac.uk

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
94
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.11 s

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

1.36 s

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

4 ms

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

0.027

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

1.24 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.

3.10 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
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
4.1 MB transferred, 57 requests
FIX
4.1 MB transferred, 57 requests
Critical::
Page weighs 6.9 MB (4.1 MB transferred)
Warning::
Images are 2.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.6 MB
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
Fonts are 278 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 278 KB
Info::
57 HTTP requests
Info::
Estimated 0.87 g CO2 per page load
4.1 MB / 2.4 MB budget
4.1 MB transferred
57 requests
0.87 g CO2 per page load
Images 2.6 MiB 63%
JavaScript 1.2 MiB 28%
Fonts 278.4 KiB 7%
CSS 64.5 KiB 2%
HTML 24.1 KiB 1%
Other 8.0 KiB 0%
Other 6.7 KiB 0%
Other 636 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

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 (4.1 MiB of 4.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
25 scripts, 375 KB unused
FIX
25 scripts, 375 KB unused
Warning::
https://www.liverpool.ac.uk/rb/latest/assets/redbr...: 69 KB unused (60%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-D5RC...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-167...: 63 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-629...: 60 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WNR...: 60 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 375 KB
375 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.liverpool.ac.uk/rb/latest/assets/redbrick.js115 KB69 KB (60%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0172 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0129 KB63 KB (49%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0145 KB60 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WNRD24SK181 KB60 KB (33%)✓3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js123 KB55 KB (45%)✓3rd
https://cdn.livechatinc.com/widget/static/js/0.DZnh-gN6.chunk.js25 KB—✓3rd
https://cdn.livechatinc.com/widget/static/js/3.BkPmegIK.chunk.js41 KB—✓3rd
https://api.livechatinc.com/v3.6/customer/action/get_dynamic_configuration?x-region=us-south1&license_id=12897657&client_id=c5e4f61e1a6c3b1521b541bc5c5a2ac5&url=https%3A%2F%2Fwww.liverpool.ac.uk%2F&channel_type=code&origin=livechat&implementation_type=manual_channels&jsonp=__f77c2tyc5jc1 KB—✓3rd
https://api.livechatinc.com/v3.6/customer/action/get_configuration?organization_id=8d06c3f2-daf0-42df-adb9-73df486451fc&version=2155.0.10.2245.333.1290.154.44.3.1.3.8.1&x-region=us-south1&group_id=22&jsonp=__lc_static_config2 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
57 resources · 4.1 MB · 375 KB savings available
FIX
57 resources · 4.1 MB · 375 KB savings available
Warning::
Page weight 3.1 MB over 1MB target
Got: 4.1 MB Expected: ≤ 1 MB
Info::
~375 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
6 resources over 200KB
57 resources · 4.1 MiB · 56 third-party 3.1 MiB over 1MB target
Image 63% · 2.6 MiB
JavaScript 28% · 1.2 MiB
Font 7% · 278.4 KiB
CSS 2% · 64.5 KiB
Document 1% · 26.8 KiB
Other 0% · 2.6 KiB

~375.2 KiB of savings available

Remove unused JavaScript: 375.2 KiB
B
Image Optimization
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Info::
All images are well-optimized
13 images 2.6 MB
0 oversized -0 KB
5 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
582ms total JS execution
REVIEW
582ms total JS execution
Info::
https://www.liverpool.ac.uk/: 238ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-WNR...: 111ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-D5RC...: 100ms CPU time
Info::
Unattributable: 78ms CPU time
Info::
https://cc.cdn.civiccomputing.com/9/cookieControl-...: 54ms CPU time
Warning::
Third-party scripts: 582ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Style & Layout 24% Other 18% Script Parsing & Compilation 7%
ScriptTotalScriptingParse/CompileParty
https://www.liverpool.ac.uk/238ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-WNRD24SK111ms79ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0100ms88ms11ms3rd
Unattributable78ms2ms0ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js54ms44ms10ms3rd
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

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
4 fonts (278 KB)
PASS
4 fonts (278 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

278 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 1.1 s LCP 1.4 shttps://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2poppins-latin-400-norma... https://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2 — 8.3 KiB — 41 ms — font-display: swaphttps://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2poppins-latin-700-norma... https://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2 — 8.2 KiB — 40 ms — font-display: swaphttps://fonts.gstatic.com/s/materialsymbolsoutlined/v146/kJF1BvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzByHX9rA6RzaxHMPdY43zj-jCxv3fzvRNU22ZXGJpEpjC_1v-p_4MrImHCIJIZrDDxHOej.woff2kJF1BvYX7BgnkSrUwT8Ohrd... https://fonts.gstatic.com/s/materialsymbolsoutlined/v146/kJF1BvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzByHX9rA6RzaxHMPdY43zj-jCxv3fzvRNU22ZXGJpEpjC_1v-p_4MrImHCIJIZrDDxHOej.woff2 — 253.4 KiB — 170 ms — font-display: swaphttps://www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922rb-icons.woff2 https://www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922 — 8.5 KiB — 39 ms — font-display: swap
poppins-latin-400-norma... woff2 swap
Size 8 KB
Load time 41 ms
Start 489 ms
Risk FOUT — text flashes from fallback to web font
poppins-latin-700-norma... woff2 swap
Size 8 KB
Load time 40 ms
Start 490 ms
Risk FOUT — text flashes from fallback to web font
kJF1BvYX7BgnkSrUwT8Ohrd... woff2 swap
Size 253 KB
Load time 170 ms
Start 492 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
rb-icons.woff2 woff2 swap
Size 9 KB
Load time 39 ms
Start 635 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 ~127 KB and ~254 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
57 requests over 1912ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.4 shttps://liverpool.ac.uk// https://liverpool.ac.uk/ — 301 — 136 B — 135 ms — http/1.1https://www.liverpool.ac.uk/www.liverpool.ac.uk/ https://www.liverpool.ac.uk/ — 200 — 23.1 KiB — 194 ms — http/1.1https://www.liverpool.ac.uk/rb/latest/assets/redbrick.csswww.liverpool.ac.uk/rb/latest/asset... https://www.liverpool.ac.uk/rb/latest/assets/redbrick.css — 200 — 64.5 KiB — 131 ms — http/1.1https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/open-day-homepage-parent.jpgwsrv.nl/?output=webp&url=www.liverp... https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/open-day-homepage-parent.jpg — 200 — 133.1 KiB — 121 ms — h3https://www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpgwww.liverpool.ac.uk/media/livacuk/r... https://www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpg — 200 — 189.0 KiB — 245 ms — http/1.1https://www.liverpool.ac.uk/rb/latest/assets/redbrick.jswww.liverpool.ac.uk/rb/latest/asset... https://www.liverpool.ac.uk/rb/latest/assets/redbrick.js — 200 — 114.6 KiB — 214 ms — http/1.1https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/Two,students,working,on,campus.jpgwsrv.nl/?w=1920&we&output=webp&url=... https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/Two,students,working,on,campus.jpg — 200 — 101.1 KiB — 35 ms — h3https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/india-campus-courtyard.jpgwsrv.nl/?w=1920&we&output=webp&url=... https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/india-campus-courtyard.jpg — 200 — 358.1 KiB — 145 ms — h3https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/redbrick/QS,2026,badge.png&fit=contain&w=720&h=720&trim=10wsrv.nl/?url=www.liverpool.ac.uk/me... https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/redbrick/QS,2026,badge.png&fit=contain&w=720&h=720&trim=10 — 200 — 233.7 KiB — 139 ms — h3https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/about/Accolades,-,TEF.png&fit=contain&w=720&h=720&trim=10wsrv.nl/?url=www.liverpool.ac.uk/me... https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/about/Accolades,-,TEF.png&fit=contain&w=720&h=720&trim=10 — 200 — 119.3 KiB — 127 ms — h3https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/redbrick/times-top-20.jpg&fit=contain&w=720&h=720&trim=10wsrv.nl/?url=www.liverpool.ac.uk/me... https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/redbrick/times-top-20.jpg&fit=contain&w=720&h=720&trim=10 — 200 — 348.7 KiB — 145 ms — h3https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/about/the-ranking.png&fit=contain&w=720&h=720&trim=10wsrv.nl/?url=www.liverpool.ac.uk/me... https://wsrv.nl/?url=www.liverpool.ac.uk/media/livacuk/about/the-ranking.png&fit=contain&w=720&h=720&trim=10 — 200 — 129.4 KiB — 97 ms — h3https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/lightbulb-moments-promo-text.jpgwsrv.nl/?w=1920&we&output=webp&url=... https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/lightbulb-moments-promo-text.jpg — 200 — 171.1 KiB — 134 ms — h3https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/student-life,(3),(1).jpgwsrv.nl/?w=1920&we&output=webp&url=... https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/student-life,(3),(1).jpg — 200 — 392.8 KiB — 146 ms — h3https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/global-cropped,(1).jpgwsrv.nl/?w=1920&we&output=webp&url=... https://wsrv.nl/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/global-cropped,(1).jpg — 200 — 279.1 KiB — 141 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-WNRD24SKwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-WNRD24SK — 200 — 181.1 KiB — 190 ms — h2https://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2www.liverpool.ac.uk/rb/latest/asset... https://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2 — 200 — 8.3 KiB — 41 ms — http/1.1https://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2www.liverpool.ac.uk/rb/latest/asset... https://www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2 — 200 — 8.2 KiB — 40 ms — http/1.1https://fonts.gstatic.com/s/materialsymbolsoutlined/v146/kJF1BvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzByHX9rA6RzaxHMPdY43zj-jCxv3fzvRNU22ZXGJpEpjC_1v-p_4MrImHCIJIZrDDxHOej.woff2fonts.gstatic.com/s/materialsymbols... https://fonts.gstatic.com/s/materialsymbolsoutlined/v146/kJF1BvYX7BgnkSrUwT8OhrdQw4oELdPIeeII9v6oDMzByHX9rA6RzaxHMPdY43zj-jCxv3fzvRNU22ZXGJpEpjC_1v-p_4MrImHCIJIZrDDxHOej.woff2 — 200 — 253.4 KiB — 170 ms — h3https://www.liverpool.ac.uk/media/livacuk/redbrick/icons/conversation.svgwww.liverpool.ac.uk/media/livacuk/r... https://www.liverpool.ac.uk/media/livacuk/redbrick/icons/conversation.svg — 200 — 2.1 KiB — 44 ms — http/1.1https://www.liverpool.ac.uk/src/homepage/newswww.liverpool.ac.uk/src/homepage/ne... https://www.liverpool.ac.uk/src/homepage/news — 200 — 1.5 KiB — 36 ms — http/1.1https://www.liverpool.ac.uk/src/homepage/eventswww.liverpool.ac.uk/src/homepage/ev... https://www.liverpool.ac.uk/src/homepage/events — 200 — 1.1 KiB — 61 ms — http/1.1https://wsrv.nl/?output=webp&url=https://news.liverpool.ac.uk/wp-content/uploads/2026/03/Untitled-2026-03-30T111959.234.pngwsrv.nl/?output=webp&url=https://ne... https://wsrv.nl/?output=webp&url=https://news.liverpool.ac.uk/wp-content/uploads/2026/03/Untitled-2026-03-30T111959.234.png — 200 — 167.9 KiB — 28 ms — h3https://www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922www.liverpool.ac.uk/rb/latest/asset... https://www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922 — 200 — 8.5 KiB — 39 ms — http/1.1https://wsrv.nl/?output=webp&url=https%3A%2F%2Ftulip-assets.liverpool.ac.uk%2FEVENT%2Fimages%2F3%2F9%2F27539.pngwsrv.nl/?output=webp&url=https%3A%2... https://wsrv.nl/?output=webp&url=https%3A%2F%2Ftulip-assets.liverpool.ac.uk%2FEVENT%2Fimages%2F3%2F9%2F27539.png — 200 — 28.9 KiB — 24 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 — 123.2 KiB — 72 ms — h3https://www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0 — 200 — 172.0 KiB — 94 ms — h2https://www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0 — 200 — 129.2 KiB — 76 ms — h2https://www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0 — 200 — 145.4 KiB — 62 ms — h2https://cdn.livechatinc.com/tracking.jscdn.livechatinc.com/tracking.js https://cdn.livechatinc.com/tracking.js — 200 — 32.9 KiB — 11 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s FCP 1.1 s LCP 1.4 shttps://liverpool.ac.uk// https://liverpool.ac.uk/ — 301 — 136 B — 135 ms — http/1.1https://www.liverpool.ac.uk/www.liverpool.ac.uk/ https://www.liverpool.ac.uk/ — 200 — 23.1 KiB — 194 ms — http/1.1https://www.liverpool.ac.uk/rb/latest/assets/redbrick.csswww.liverpool.ac.uk/rb/latest/asset... https://www.liverpool.ac.uk/rb/latest/assets/redbrick.css — 200 — 64.5 KiB — 131 ms — http/1.1https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/open-day-homepage-parent.jpgwsrv.nl/?output=webp&url=www.liverp... https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/open-day-homepage-parent.jpg — 200 — 133.1 KiB — 121 ms — h3https://www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpgwww.liverpool.ac.uk/media/livacuk/r... https://www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpg — 200 — 189.0 KiB — 245 ms — 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h2https://cdn.livechatinc.com/widget/static/js/1.BlD1Z9eS.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/1.BlD1Z9eS.chunk.js — 200 — 20.0 KiB — 9 ms — h2https://cdn.livechatinc.com/widget/static/js/2.CgGX4iz_.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/2.CgGX4iz_.chunk.js — 200 — 91.9 KiB — 30 ms — h2https://cdn.livechatinc.com/widget/static/js/3.BkPmegIK.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/3.BkPmegIK.chunk.js — 200 — 41.3 KiB — 30 ms — h2https://cdn.livechatinc.com/widget/static/js/4.CwsCQJwf.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/4.CwsCQJwf.chunk.js — 200 — 62.3 KiB — 31 ms — h2https://cdn.livechatinc.com/widget/static/js/5.D-PsQDDK.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/5.D-PsQDDK.chunk.js — 200 — 7.5 KiB — 15 ms — h2https://cdn.livechatinc.com/widget/static/js/6.DoTVWiIk.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/6.DoTVWiIk.chunk.js — 200 — 2.6 KiB — 16 ms — h2https://cdn.livechatinc.com/widget/static/js/7.qYTqns9Q.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/7.qYTqns9Q.chunk.js — 200 — 604 B — 17 ms — h2https://cdn.livechatinc.com/widget/static/js/8.Cf2SBlCU.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/8.Cf2SBlCU.chunk.js — 200 — 3.5 KiB — 19 ms — h2https://cdn.livechatinc.com/widget/static/js/9.xhyEK0_l.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/9.xhyEK0_l.chunk.js — 200 — 638 B — 24 ms — h2https://cdn.livechatinc.com/widget/static/js/10.YIQHsUm5.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/10.YIQHsUm5.chunk.js — 200 — 39.9 KiB — 27 ms — h2https://cdn.livechatinc.com/widget/static/js/11.al-9NYxR.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/11.al-9NYxR.chunk.js — 200 — 801 B — 22 ms — h2https://cdn.livechatinc.com/widget/static/js/12.DJPUQwQu.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/12.DJPUQwQu.chunk.js — 200 — 864 B — 24 ms — h2https://www.liverpool.ac.uk/rb/assets/icon.svgwww.liverpool.ac.uk/rb/assets/icon.... https://www.liverpool.ac.uk/rb/assets/icon.svg — 200 — 7.8 KiB — 37 ms — http/1.1https://accounts.livechatinc.com/v2/customer/tokenaccounts.livechatinc.com/v2/custome... https://accounts.livechatinc.com/v2/customer/token — 200 — 1.3 KiB — 152 ms — h2
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 582ms · 499KB · £6/mo
www.liverpool.ac.uk
Other
Costly
Execution 238ms
Transfer 23 KB
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 111ms
Transfer 181 KB
Unused 33%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 100ms
Transfer 172 KB
Unused 40%
Monthly Cost £1/mo
Unattributable
Other
Optional
Execution 78ms
Transfer 0 KB
Monthly Cost £1/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 54ms
Transfer 123 KB
Unused 45%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.liverpool.ac.uk adds 238ms and costs ~£2/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.liverpool.ac.uk takes 238ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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