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.
5.25 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.94 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.65 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.004
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
8.76 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.
17.31 s
Page Load Progression
FPage Weight BudgetAction3.3 MB transferred, 79 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
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4694ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 1173ms | 206ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-KF8NCW2 | 1022ms | 922ms | 66ms | 3rd |
| https://www.vic.gov.au/ | 867ms | 328ms | 2ms | 3rd |
| https://www.vic.gov.au/_nuxt/B9HF065p.js | 721ms | 661ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DPWDSMVDMQ&cx=c>m=4e64h1 | 474ms | 354ms | 66ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 249ms | 204ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-T5283GW | 188ms | 130ms | 54ms | 3rd |
FJS BundlesAction41 scripts, 925 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 (45%) | ✓ | 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 InventoryAction79 resources · 3.3 MB · 925 KB savings availableFIX
~924.9 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 79 resources | 3.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization10 images, 0 KB saveableREVIEW
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
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall79 requests over 8184msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 1173ms | 0 KB | — | A$20/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 1022ms | 144 KB | 38% | A$18/mo | Costly |
www.vic.gov.au www.vic.gov.au | Other | 867ms | 81 KB | — | A$15/mo | Costly |
www.vic.gov.au www.vic.gov.au | Other | 721ms | 983 KB | 75% | A$12/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 474ms | 164 KB | 40% | A$8/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 249ms | 26 KB | — | A$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 188ms | 149 KB | 45% | A$3/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 1173ms and costs ~A$20/month
- Google Tag Manager adds 1022ms and costs ~A$18/month
- www.vic.gov.au adds 867ms and costs ~A$15/month
- www.vic.gov.au adds 721ms and costs ~A$12/month
- Google Tag Manager adds 474ms and costs ~A$8/month
- Microsoft Clarity adds 249ms 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
Unattributable takes 1173ms 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 1022ms 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 867ms 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 721ms 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
Google Tag Manager takes 474ms 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
Microsoft Clarity takes 249ms 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