Performance
· 15 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.
1.19 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
1.77 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
66 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
1.147
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.79 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.
2.62 s
Page Load Progression
DPage Weight BudgetAction2.4 MB transferred, 65 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 ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction20 scripts, 559 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.homeaffairs.gov.au/AssetLibrary/dist/angular/tiles-topics.js | 285 KB | 143 KB (50%) | ✓ | 3rd |
| https://www.homeaffairs.gov.au/_layouts/15/core.js?rev=2yfzl8JcbdXfGbMFcOjIqQ%3D%3DTAG0 | 120 KB | 108 KB (91%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N2HGXM | 138 KB | 69 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VJMFJ4QKL5&cx=c>m=4e64k0 | 150 KB | 65 KB (44%) | ✓ | 3rd |
| https://www.homeaffairs.gov.au/AssetLibrary/dist/js/app.library.js | 112 KB | 60 KB (54%) | ✓ | 3rd |
| https://www.homeaffairs.gov.au/_layouts/15/init.js?rev=qqM0K0rewR3fyZ4ixmIBDw%3D%3DTAG0 | 76 KB | 55 KB (74%) | ✓ | 3rd |
| https://www.homeaffairs.gov.au/AssetLibrary/dist/js/app.core.js | 52 KB | 33 KB (64%) | ✓ | 3rd |
| https://public-cdn.translate.gov.au/ajax/odwt-translation/default/translation.js | 34 KB | 26 KB (76%) | ✗ | 3rd |
| https://cdn.monsido.com/tool/javascripts/monsido.js | 5 KB | — | ✓ | 3rd |
| https://www.homeaffairs.gov.au/WebResource.axd?d=-_0HKjcPNwWtjNsql0gjhceqFGee_ToS8nckuxgS00YWNgnjoDKReywBNKXTdbM2My-vfS7Hma_zXNAZRygN_ajleyugP6es1ZdYsyUhQz41&t=638942570805310136 | 7 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 InventoryAction65 resources · 2.4 MB · 559 KB savings availableFIX
~558.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 65 resources | 2.4 MiB | ||||||
CImage OptimizationAction33 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
BJS Execution Cost662ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.homeaffairs.gov.au/ | 175ms | 20ms | 3ms | 3rd |
| Unattributable | 166ms | 1ms | 0ms | 3rd |
| https://www.homeaffairs.gov.au/AssetLibrary/dist/js/app.library.js | 147ms | 98ms | 5ms | 3rd |
| https://www.homeaffairs.gov.au/AssetLibrary/dist/angular/tiles-topics.js | 107ms | 84ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-VJMFJ4QKL5&cx=c>m=4e64k0 | 66ms | 54ms | 11ms | 3rd |
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmax-age=0REVIEW
max-age=0
| Directive | Value | Meaning |
|---|---|---|
| max-age | 0 | Cache for 0 seconds |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (175 KB)PASS
Web fonts
6
175 KB total
Render-blocking
0
of 6
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
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 ~2 KB and ~4 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall65 requests over 1358msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.homeaffairs.gov.au www.homeaffairs.gov.au | Other | 175ms | 124 KB | — | A$3/mo | Optional |
Unattributable Unattributable | Other | 166ms | 0 KB | — | A$3/mo | Optional |
www.homeaffairs.gov.au www.homeaffairs.gov.au | Other | 147ms | 112 KB | 54% | A$3/mo | Optional |
www.homeaffairs.gov.au www.homeaffairs.gov.au | Other | 107ms | 285 KB | 50% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 66ms | 150 KB | 44% | A$1/mo | Optional |
100% 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
54% of www.homeaffairs.gov.au'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
50% of www.homeaffairs.gov.au'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