Performance
· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.Performance-focused optimization plan with CWV assessment, top offenders, and time estimates
First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.
5.55 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
14.16 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.09 s
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.
7.84 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.
14.37 s
Page Load Progression
DPage Weight BudgetAction2.2 MB transferred, 61 requestsFIX
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.
Source: web.dev
DThird-Party ImpactAction99% third-party, 0 ms blockingFIX
FJS Execution CostAction3678ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.jg-cdn.com/assets/jg-homepage/gb-819cdb9c4c92251abf24.js | 757ms | 491ms | 69ms | 3rd |
| https://consent.cookiebot.com/b92ba240-82c3-4d0a-8e54-624851e5ad86/cc.js?renew=false&referer=justgiving.com&dnt=false&init=false | 730ms | 311ms | 44ms | 3rd |
| Unattributable | 458ms | 46ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-12735980&cx=c>m=4e64k0h2 | 331ms | 300ms | 28ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CMKKD1B2MR&cx=c>m=4e64k0h2 | 308ms | 201ms | 43ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WL6ZNN | 292ms | 235ms | 42ms | 3rd |
| https://www.jg-cdn.com/chrome/chrome-0c08644c472bcf1e4ede.js | 216ms | 129ms | 22ms | 3rd |
| https://consent.cookiebot.com/uc.js?cbid=b92ba240-82c3-4d0a-8e54-624851e5ad86 | 157ms | 139ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1008305825&cx=c>m=4e64k0h2 | 153ms | 116ms | 36ms | 3rd |
| https://justgiving.com/ | 149ms | 11ms | 2ms | 1st |
Showing top 10 of 11 scripts
DJS BundlesAction15 scripts, 474 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.jg-cdn.com/assets/jg-homepage/gb-819cdb9c4c92251abf24.js | 255 KB | 100 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WL6ZNN | 180 KB | 68 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-CMKKD1B2MR&cx=c>m=4e64k0h2 | 179 KB | 67 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=DC-12735980&cx=c>m=4e64k0h2 | 130 KB | 65 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1008305825&cx=c>m=4e64k0h2 | 144 KB | 64 KB (45%) | ✓ | 3rd |
| https://www.jg-cdn.com/chrome/chrome-0c08644c472bcf1e4ede.js | 78 KB | 35 KB (45%) | ✓ | 3rd |
| https://www.jg-cdn.com/assets/jg-homepage/polyfill-3987cc5b232aad2d0de9.js | 68 KB | 26 KB (40%) | ✓ | 3rd |
| https://consent.cookiebot.com/b92ba240-82c3-4d0a-8e54-624851e5ad86/cc.js?renew=false&referer=justgiving.com&dnt=false&init=false | 123 KB | 25 KB (21%) | ✓ | 3rd |
| https://consent.cookiebot.com/uc.js?cbid=b92ba240-82c3-4d0a-8e54-624851e5ad86 | 36 KB | 23 KB (64%) | ✓ | 3rd |
| https://api.justgiving.com/chrome/client | 28 KB | — | ✓ | 3rd |
Consider code splitting or tree shaking to reduce unused code.
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.
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.
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.
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.
This bundle has high unused code — code-split or tree-shake to ship only what executes.
Source: web.dev / Lighthouse coverage
FPage Weight InventoryAction61 resources · 2.2 MB · 474 KB savings availableFIX
~474.1 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 61 resources | 2.2 MiB | ||||||
CImage OptimizationAction27 images, 0 KB saveableREVIEW
Set explicit width and height to prevent CLS.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.
Source: web.dev / Core Web Vitals
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (44 KB)PASS
Web fonts
3
44 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
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 CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+HTTP Cachingmax-age=60 (1 minute)PASS
public, max-age=60
| Directive | Value | Meaning |
|---|---|---|
| public | — | Any cache may store this response |
| max-age | 60 | Cache for 1 minute |
Network Waterfall61 requests over 3163msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.jg-cdn.com www.jg-cdn.com | Other | 757ms | 255 KB | 39% | €13/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 730ms | 123 KB | 21% | €13/mo | Costly |
Unattributable Unattributable | Other | 458ms | 0 KB | — | €8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 331ms | 130 KB | 50% | €6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 308ms | 179 KB | 38% | €5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 292ms | 180 KB | 38% | €5/mo | Costly |
www.jg-cdn.com www.jg-cdn.com | Other | 216ms | 78 KB | 45% | €4/mo | Costly |
consent.cookiebot.com consent.cookiebot.com | Other | 157ms | 36 KB | 64% | €3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 153ms | 144 KB | 45% | €3/mo | Optional |
www.jg-cdn.com www.jg-cdn.com | Other | 127ms | 68 KB | 40% | €2/mo | Optional |
These scripts may cost more than they're worth
- www.jg-cdn.com adds 757ms and costs ~€13/month
- consent.cookiebot.com adds 730ms and costs ~€13/month
- Unattributable adds 458ms and costs ~€8/month
- Google Tag Manager adds 331ms and costs ~€6/month
- Google Tag Manager adds 308ms and costs ~€5/month
- Google Tag Manager adds 292ms and costs ~€5/month
- www.jg-cdn.com adds 216ms and costs ~€4/month
96% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.
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.jg-cdn.com takes 757ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
consent.cookiebot.com takes 730ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Unattributable takes 458ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 331ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
50% of Google Tag Manager's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev
Google Tag Manager takes 308ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
Google Tag Manager takes 292ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
www.jg-cdn.com takes 216ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.
This script has high main-thread execution time — optimize hot paths or defer.
Source: web.dev
64% of consent.cookiebot.com's code is unused. The script may be loading features you don't use.
Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.
Source: web.dev