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.
3.74 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.74 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
314 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.009
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.85 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.
6.13 s
Page Load Progression
509 ms 1.0 s 1.5 s 2.0 s 2.5 s
3.1 s 3.6 s
4.1 sDPage Weight BudgetAction2.4 MB transferred, 80 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 BundlesAction41 scripts, 926 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.vic.gov.au/_nuxt/B9HF065p.js | 983 KB | 737 KB (75%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-T5283GW | 149 KB | 68 KB (46%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DPWDSMVDMQ&cx=c>m=4e64h1 | 164 KB | 65 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KF8NCW2 | 144 KB | 55 KB (38%) | ✓ | 3rd |
| https://www.vic.gov.au/_nuxt/DBbAqbIm.js | 5 KB | — | ✓ | 3rd |
| https://www.clarity.ms/tag/s0qpm61dlm?ref=gtm | 1 KB | — | ✓ | 3rd |
| https://www.vic.gov.au/_nuxt/DIC3yRQe.js | 5 KB | — | ✓ | 3rd |
| https://www.vic.gov.au/_nuxt/BZRe558B.js | 5 KB | — | ✓ | 3rd |
| https://www.vic.gov.au/_nuxt/QT9raxv8.js | 5 KB | — | ✓ | 3rd |
| https://www.vic.gov.au/_nuxt/B5P2Evt8.js | 5 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
FPage Weight InventoryAction80 resources · 2.4 MB · 926 KB savings availableFIX
~925.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 80 resources | 2.4 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization11 images, 0 KB saveableREVIEW
CJS Execution CostAction1145ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-KF8NCW2 | 306ms | 268ms | 17ms | 3rd |
| Unattributable | 268ms | 53ms | 0ms | 3rd |
| https://www.vic.gov.au/ | 204ms | 86ms | 1ms | 3rd |
| https://www.vic.gov.au/_nuxt/B9HF065p.js | 179ms | 161ms | 6ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DPWDSMVDMQ&cx=c>m=4e64h1 | 120ms | 93ms | 25ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 68ms | 58ms | 3ms | 3rd |
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 Loading2 fonts (52 KB)PASS
Web fonts
2
52 KB total
Render-blocking
0
of 2
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 HintsNo optimization neededPASS
Network Waterfall80 requests over 7381msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Google Tag Manager www.googletagmanager.com | Tag Manager | 306ms | 144 KB | 38% | A$5/mo | Costly |
Unattributable Unattributable | Other | 268ms | 0 KB | — | A$5/mo | Costly |
www.vic.gov.au www.vic.gov.au | Other | 204ms | 81 KB | — | A$4/mo | Costly |
www.vic.gov.au www.vic.gov.au | Other | 179ms | 983 KB | 75% | A$3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 120ms | 164 KB | 40% | A$2/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 68ms | 26 KB | — | A$1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 306ms and costs ~A$5/month
- Unattributable adds 268ms and costs ~A$5/month
- www.vic.gov.au adds 204ms and costs ~A$4/month
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
Google Tag Manager takes 306ms 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 268ms 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.vic.gov.au takes 204ms 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
75% of www.vic.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