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https://city.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
66
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.

1.28 s

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

6.70 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.

0.043

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

2.65 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.

7.11 s

Page Load Progression

424 ms
848 ms
1.3 s
1.7 s
2.1 s
2.5 s
3.0 s
3.4 s
Checks
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
17.7 MB transferred, 75 requests
FIX
17.7 MB transferred, 75 requests
Critical::
Page weighs 20.0 MB (17.7 MB transferred)
Warning::
Images are 10.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.7 MB
Warning::
JavaScript is 525 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 525 KB
Info::
Fonts are 303 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 303 KB
Info::
75 HTTP requests
Info::
Estimated 3.7 g CO2 per page load
17.7 MB / 2.4 MB budget
17.7 MB transferred
75 requests
3.7 g CO2 per page load
Images 10.7 MiB 61%
Other 6.0 MiB 34%
JavaScript 525.5 KiB 3%
Fonts 302.8 KiB 2%
CSS 57.0 KiB 0%
HTML 35.5 KiB 0%
Other 12.6 KiB 0%
Other 9.3 KiB 0%
Other 1.2 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 (17.7 MiB of 17.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
75 resources · 17.7 MB · 196 KB savings available
FIX
75 resources · 17.7 MB · 196 KB savings available
Warning::
Page weight 16.7 MB over 1MB target
Got: 17.7 MB Expected: ≤ 1 MB
Info::
~196 KB of savings available
Warning::
74 third-party resources (100% of weight)
Info::
15 resources over 200KB
75 resources · 17.7 MiB · 74 third-party 16.7 MiB over 1MB target
Image 61% · 10.8 MiB
Media 34% · 6.0 MiB
JavaScript 3% · 525.5 KiB
Font 2% · 302.8 KiB
CSS 0% · 57.0 KiB
Document 0% · 35.5 KiB
Other 0% · 10.7 KiB

~195.8 KiB of savings available

Remove unused JavaScript: 195.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
35 images, 0 KB saveable
REVIEW
35 images, 0 KB saveable
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/imag... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/file... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
35 images 10.7 MB
0 oversized -0 KB
33 legacy format
21 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

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

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

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

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

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
662ms total JS execution
REVIEW
662ms total JS execution
Info::
https://www.citystgeorges.ac.uk/: 245ms CPU time
Info::
Unattributable: 231ms CPU time
Info::
https://consent.cookiebot.com/d20f0709-234f-4c30-b...: 102ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5B7...: 83ms CPU time
Warning::
Third-party scripts: 662ms (100% of total)

Main Thread Breakdown

Other 35% Script Evaluation 25% Style & Layout 22% Parse HTML & CSS 7% Script Parsing & Compilation 6% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.citystgeorges.ac.uk/245ms3ms0ms3rd
Unattributable231ms3ms0ms3rd
https://consent.cookiebot.com/d20f0709-234f-4c30-b3b6-1298df75d244/cc.js?renew=false&referer=www.citystgeorges.ac.uk&dnt=false&init=false102ms44ms8ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5B77FVX83ms68ms14ms3rd
C
JS Bundles
Action
11 scripts, 196 KB unused
REVIEW
11 scripts, 196 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5B7...: 84 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/git_...: 36 KB unused (99%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/git_...: 29 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://consent.cookiebot.com/d20f0709-234f-4c30-b...: 25 KB unused (23%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.citystgeorges.ac.uk/__data/assets/git_...: 22 KB unused (81%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 196 KB
196 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5B77FVX194 KB84 KB (43%)✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/vendor-direct.js?v=2026.04.1436 KB36 KB (99%)✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/vendor-dependencies.js?v=2026.04.1435 KB29 KB (82%)✓3rd
https://consent.cookiebot.com/d20f0709-234f-4c30-b3b6-1298df75d244/cc.js?renew=false&referer=www.citystgeorges.ac.uk&dnt=false&init=false112 KB25 KB (23%)✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/main.js?v=2026.04.1427 KB22 KB (81%)✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/core.js?v=2026.04.1426 KB—✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/axios.js?v=2026.04.147 KB—✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/react.js?v=2026.04.1439 KB—✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/search.js?v=2026.04.1416 KB—✓3rd
https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/js/browser-search-box.js?v=2026.04.146 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
14 fonts (303 KB)
PASS
14 fonts (303 KB)
Info::
14 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

14

303 KB total

Render-blocking

0

of 14

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 1.3 s LCP 6.7 shttps://use.typekit.net/af/2cef2b/000000000000000077359445/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n4&v=3l https://use.typekit.net/af/2cef2b/000000000000000077359445/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n4&v=3 — 23.8 KiB — 25 ms — font-display: swaphttps://use.typekit.net/af/4e0d0a/000000000000000077359994/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n3&v=3l https://use.typekit.net/af/4e0d0a/000000000000000077359994/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n3&v=3 — 30.4 KiB — 34 ms — font-display: swaphttps://use.typekit.net/af/e8b7d1/00000000000000007735999d/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n6&v=3l https://use.typekit.net/af/e8b7d1/00000000000000007735999d/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n6&v=3 — 36.4 KiB — 27 ms — font-display: swaphttps://use.typekit.net/af/3b0680/000000000000000077359463/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n7&v=3l https://use.typekit.net/af/3b0680/000000000000000077359463/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n7&v=3 — 25.7 KiB — 31 ms — font-display: swaphttps://use.typekit.net/af/584488/0000000000000000773599ca/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n4&v=3l https://use.typekit.net/af/584488/0000000000000000773599ca/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n4&v=3 — 34.7 KiB — 33 ms — font-display: swaphttps://use.typekit.net/af/64a2a3/0000000000000000773599cd/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n7&v=3l https://use.typekit.net/af/64a2a3/0000000000000000773599cd/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n7&v=3 — 36.6 KiB — 21 ms — font-display: swaphttps://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp-regular-400.woff2fa-sharp-regular-400.woff2 https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp-regular-400.woff2 — 11.6 KiB — 45 ms — font-display: swaphttps://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-regular-400.woff2 — 14.0 KiB — 43 ms — font-display: swaphttps://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp-light-300.woff2fa-sharp-light-300.woff2 https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp-light-300.woff2 — 12.9 KiB — 76 ms — font-display: swaphttps://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp-solid-900.woff2fa-sharp-solid-900.woff2 https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp-solid-900.woff2 — 9.5 KiB — 45 ms — font-display: swaphttps://use.typekit.net/af/fd9187/00000000000000007735945d/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n6&v=3l https://use.typekit.net/af/fd9187/00000000000000007735945d/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=n6&v=3 — 25.2 KiB — 12 ms — font-display: swaphttps://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-brands-400.woff2 — 4.1 KiB — 49 ms — font-display: swaphttps://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.citystgeorges.ac.uk/__data/assets/git_bridge/0011/976169/main/fonts/fa-solid-900.woff2 — 12.5 KiB — 51 ms — font-display: swaphttps://use.typekit.net/af/7aa6bf/000000000000000077359422/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=i4&v=3l https://use.typekit.net/af/7aa6bf/000000000000000077359422/31/l?primer=37f831d36666d4cfb865d06c711082244262f12b3e486257fdd5696c36ac17f0&fvd=i4&v=3 — 25.4 KiB — 5 ms — font-display: swap
l woff2 swap
Size 24 KB
Load time 25 ms
Start 411 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 30 KB
Load time 34 ms
Start 411 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 36 KB
Load time 27 ms
Start 412 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 31 ms
Start 412 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 35 KB
Load time 33 ms
Start 412 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 37 KB
Load time 21 ms
Start 413 ms
Risk FOUT — text flashes from fallback to web font
fa-sharp-regular-400.woff2 woff2 swap
Size 12 KB
Load time 45 ms
Start 413 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 14 KB
Load time 43 ms
Start 417 ms
Risk FOUT — text flashes from fallback to web font
fa-sharp-light-300.woff2 woff2 swap
Size 13 KB
Load time 76 ms
Start 417 ms
Risk FOUT — text flashes from fallback to web font
fa-sharp-solid-900.woff2 woff2 swap
Size 9 KB
Load time 45 ms
Start 417 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 25 KB
Load time 12 ms
Start 418 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 4 KB
Load time 49 ms
Start 418 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 13 KB
Load time 51 ms
Start 418 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 25 KB
Load time 5 ms
Start 713 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
75 requests over 1079ms
INFO
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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 662ms · 340KB · £7/mo
www.citystgeorges.ac.uk
Other
Costly
Execution 245ms
Transfer 35 KB
Monthly Cost £3/mo
Unattributable
Other
Costly
Execution 231ms
Transfer 0 KB
Monthly Cost £2/mo
consent.cookiebot.com
Other
Optional
Execution 102ms
Transfer 112 KB
Unused 23%
Monthly Cost £1/mo
Google Tag Manager
Tag Manager
Optional
Execution 83ms
Transfer 194 KB
Unused 43%
Monthly Cost £1/mo

These scripts may cost more than they're worth

  • www.citystgeorges.ac.uk adds 245ms and costs ~£3/month
  • Unattributable adds 231ms 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.citystgeorges.ac.uk takes 245ms 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 231ms 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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