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https://liverpool.ac.uk

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
43
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
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.

8.61 s

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

20.46 s

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

518 ms

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.

9.89 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.

20.80 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
F
Page Weight Budget
Action
3.1 MB transferred, 57 requests
FIX
3.1 MB transferred, 57 requests
Warning::
Page weighs 5.9 MB (3.1 MB transferred)
Warning::
Images are 1.6 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.6 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 0.65 g CO2 per page load
3.1 MB / 2.4 MB budget
3.1 MB transferred
57 requests
0.65 g CO2 per page load
Images 1.6 MiB 50%
JavaScript 1.2 MiB 38%
Fonts 277.7 KiB 9%
CSS 64.3 KiB 2%
HTML 24.1 KiB 1%
Other 9.6 KiB 0%
Other 7.9 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 (3.1 MiB of 3.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2472ms total JS execution
FIX
2472ms total JS execution
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-WNR...: 551ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-629...: 340ms CPU time
Warning::
Unattributable: 335ms CPU time
Warning::
https://www.liverpool.ac.uk/: 332ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-D5RC...: 220ms CPU time
Warning::
Third-party scripts: 2472ms (100% of total)

Main Thread Breakdown

Script Evaluation 53% Style & Layout 17% Other 16% Script Parsing & Compilation 9%
ScriptTotalScriptingParse/CompileParty
https://www.googletagmanager.com/gtm.js?id=GTM-WNRD24SK551ms328ms61ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0340ms308ms29ms3rd
Unattributable335ms8ms0ms3rd
https://www.liverpool.ac.uk/332ms6ms2ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0220ms148ms48ms3rd
https://cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js193ms160ms31ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0171ms128ms43ms3rd
https://cdn.livechatinc.com/tracking.js149ms101ms10ms3rd
https://www.liverpool.ac.uk/rb/latest/assets/redbrick.js114ms92ms1ms3rd
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_config68ms43ms1ms3rd
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 KB56 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=__tu2mpoa702q1 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 · 3.1 MB · 375 KB savings available
FIX
57 resources · 3.1 MB · 375 KB savings available
Warning::
Page weight 2.1 MB over 1MB target
Got: 3.1 MB Expected: ≤ 1 MB
Info::
~375 KB of savings available
Warning::
56 third-party resources (100% of weight)
Info::
3 resources over 200KB
57 resources · 3.1 MiB · 56 third-party 2.1 MiB over 1MB target
Image 51% · 1.6 MiB
JavaScript 38% · 1.2 MiB
Font 9% · 277.7 KiB
CSS 2% · 64.3 KiB
Document 1% · 29.7 KiB
Other 0% · 2.6 KiB

~375.2 KiB of savings available

Remove unused JavaScript: 375.2 KiB
C
Image Optimization
Action
13 images, 0 KB saveable
REVIEW
13 images, 0 KB saveable
Warning::
https://wsrv.nl/?output=webp&url=https://news.live... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://wsrv.nl/?output=webp&url=https%3A%2F%2Ftul... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
13 images 1.6 MB
0 oversized -0 KB
5 legacy format
2 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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 8.6 s LCP 20.5 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 — 8.0 KiB — 38 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 — 177 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 — 8.0 KiB — 37 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 — 8.3 KiB — 41 ms — font-display: swap
poppins-latin-400-norma... woff2 swap
Size 8 KB
Load time 38 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
kJF1BvYX7BgnkSrUwT8Ohrd... woff2 swap
Size 253 KB
Load time 177 ms
Start 658 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
poppins-latin-700-norma... woff2 swap
Size 8 KB
Load time 37 ms
Start 658 ms
Risk FOUT — text flashes from fallback to web font
rb-icons.woff2 woff2 swap
Size 8 KB
Load time 41 ms
Start 761 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
—
prefetch
—

2 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
57 requests over 2714ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 8.6 s LCP 20.5 shttps://liverpool.ac.uk// https://liverpool.ac.uk/ — 301 — 136 B — 141 ms — http/1.1https://www.liverpool.ac.uk/www.liverpool.ac.uk/ https://www.liverpool.ac.uk/ — 200 — 23.1 KiB — 234 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 — 64.3 KiB — 132 ms — http/1.1https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/open-day-mobile.jpgwsrv.nl/?output=webp&url=www.liverp... https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/open-day-mobile.jpg — 200 — 98.7 KiB — 149 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 — 248 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 — 217 ms — http/1.1https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/Two,students,working,on,campus.jpgwsrv.nl/?w=720&output=webp&url=www.... https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/Two,students,working,on,campus.jpg — 200 — 28.1 KiB — 31 ms — h3https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/india-campus-courtyard.jpgwsrv.nl/?w=720&output=webp&url=www.... https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/india-campus-courtyard.jpg — 200 — 67.1 KiB — 42 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 — 95 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 — 86 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 — 97 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 — 86 ms — h3https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/lightbulb-moments-promo-text.jpgwsrv.nl/?w=720&output=webp&url=www.... https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/lightbulb-moments-promo-text.jpg — 200 — 54.9 KiB — 74 ms — h3https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/student-life,(3),(1).jpgwsrv.nl/?w=720&output=webp&url=www.... https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/student-life,(3),(1).jpg — 200 — 85.4 KiB — 83 ms — h3https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/global-cropped,(1).jpgwsrv.nl/?w=720&output=webp&url=www.... https://wsrv.nl/?w=720&output=webp&url=www.liverpool.ac.uk/media/livacuk/redbrick/global-cropped,(1).jpg — 200 — 53.9 KiB — 74 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 — 181 ms — h2https://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 — 49 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 — 4.0 KiB — 282 ms — http/1.1https://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 — 8.0 KiB — 38 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 — 177 ms — h3https://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 — 8.0 KiB — 37 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 — 27 ms — 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h2https://secure.livechatinc.com/customer/action/open_chat?license_id=12897657&group=22&embedded=1&widget_version=3&unique_groups=0&organization_id=8d06c3f2-daf0-42df-adb9-73df486451fc&use_parent_storage=1&x-region=us-south1secure.livechatinc.com/customer/act... https://secure.livechatinc.com/customer/action/open_chat?license_id=12897657&group=22&embedded=1&widget_version=3&unique_groups=0&organization_id=8d06c3f2-daf0-42df-adb9-73df486451fc&use_parent_storage=1&x-region=us-south1 — 200 — 992 B — 533 ms — http/1.1https://cdn.livechatinc.com/widget/static/js/livechat.CR3zYHXF.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/livechat.CR3zYHXF.js — 200 — 996 B — 8 ms — h2https://cdn.livechatinc.com/widget/static/js/0.DZnh-gN6.chunk.jscdn.livechatinc.com/widget/static/j... https://cdn.livechatinc.com/widget/static/js/0.DZnh-gN6.chunk.js — 200 — 24.6 KiB — 6 ms — 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 — 7 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 — 22 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 — 19 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 — 22 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 — 13 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 — 14 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 — 15 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 — 16 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 — 15 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 — 20 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 — 18 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 — 19 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 — 40 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 — 243 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 2472ms · 923KB · £26/mo
Google Tag Manager
Tag Manager
Costly
Execution 551ms
Transfer 181 KB
Unused 33%
Monthly Cost £6/mo
Google Tag Manager
Tag Manager
Costly
Execution 340ms
Transfer 145 KB
Unused 41%
Monthly Cost £4/mo
Unattributable
Other
Costly
Execution 335ms
Transfer 0 KB
Monthly Cost £3/mo
www.liverpool.ac.uk
Other
Costly
Execution 332ms
Transfer 23 KB
Monthly Cost £3/mo
Google Tag Manager
Tag Manager
Costly
Execution 220ms
Transfer 172 KB
Unused 40%
Monthly Cost £2/mo
cc.cdn.civiccomputing.com
Other
Optional
Execution 193ms
Transfer 123 KB
Unused 45%
Monthly Cost £2/mo
Google Tag Manager
Tag Manager
Optional
Execution 171ms
Transfer 129 KB
Unused 49%
Monthly Cost £2/mo
LiveChat
Chat
Optional
Execution 149ms
Transfer 33 KB
Monthly Cost £2/mo
www.liverpool.ac.uk
Other
Optional
Execution 114ms
Transfer 115 KB
Unused 60%
Monthly Cost £1/mo
api.livechatinc.com
Other
Optional
Execution 68ms
Transfer 2 KB
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • Google Tag Manager adds 551ms and costs ~£6/month
  • Google Tag Manager adds 340ms and costs ~£4/month
  • Unattributable adds 335ms and costs ~£3/month
  • www.liverpool.ac.uk adds 332ms and costs ~£3/month
  • Google Tag Manager adds 220ms 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

Google Tag Manager takes 551ms 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 340ms 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 335ms 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

www.liverpool.ac.uk takes 332ms 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 220ms 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

60% of www.liverpool.ac.uk's code is unused. The script may be loading features you don't use.

Why this matters

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

Source: web.dev

How third-party costs are calculated

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

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