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.
5.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
8.82 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
302 ms
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.
7.40 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.
10.17 s
Page Load Progression
FPage Weight BudgetAction4.5 MB transferred, 163 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
Subset fonts to include only used characters, or switch to system font stacks.
Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).
Source: web.dev font loading
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.
Source: web.dev
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
DJS Execution CostAction2191ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 286ms | 16ms | 0ms | 3rd |
| https://www.rmit.edu.au/ruxitagentjs_ICANVfru_10335260306043831.js | 262ms | 238ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5DJRNQ | 252ms | 219ms | 25ms | 3rd |
| https://www.rmit.edu.au/ | 188ms | 4ms | 1ms | 3rd |
| https://assets.adobedtm.com/launch-EN5a041183e1344171bc48edbb86b1cc16.min.js | 147ms | 98ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-829652557&cx=c>m=4e64k0 | 126ms | 112ms | 12ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-335354009&cx=c>m=4e64k0 | 120ms | 92ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NF0RBW86ZP&cx=c>m=4e64k0 | 102ms | 85ms | 16ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-393330160&cx=c>m=4e64k0 | 94ms | 79ms | 13ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 90ms | 71ms | 18ms | 3rd |
Showing top 10 of 18 scripts
FJS BundlesAction55 scripts, 1.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.rmit.edu.au/etc.clientlibs/rmit/clientlibs/clientlib-base.min.08f5ee32141261c3a544705dead85d12.js | 160 KB | 109 KB (69%) | ✗ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-829652557&cx=c>m=4e64k0 | 147 KB | 106 KB (72%) | ✓ | 3rd |
| https://www.rmit.edu.au/etc.clientlibs/rmit/clientlibs/clientlib-webpack.min.e4b6f9a31c38eb8ccad8ad595581bbca.js | 98 KB | 79 KB (81%) | ✓ | 3rd |
| https://siteintercept.qualtrics.com/dxjsmodule/5.17c364950fcb67448399.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=rmitnonacademic | 73 KB | 65 KB (90%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-NF0RBW86ZP&cx=c>m=4e64k0 | 173 KB | 65 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-11366847&cx=c>m=4e64k0 | 130 KB | 61 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-5431224&cx=c>m=4e64k0 | 129 KB | 61 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5DJRNQ | 197 KB | 57 KB (29%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-393330160&cx=c>m=4e64k0 | 147 KB | 57 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-335354009&cx=c>m=4e64k0 | 146 KB | 57 KB (39%) | ✓ | 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 InventoryAction163 resources · 4.5 MB · 1.1 MB savings availableFIX
~1.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 163 resources | 4.5 MiB | ||||||
CImage OptimizationAction44 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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingno-cacheREVIEW
no-cache
| Directive | Value | Meaning |
|---|---|---|
| no-cache | — | Cache but always revalidate first |
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (441 KB)PASS
Web fonts
3
441 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~172 KB and ~344 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
Network Waterfall163 requests over 9053msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 286ms | 0 KB | — | A$4/mo | Costly |
www.rmit.edu.au www.rmit.edu.au | Other | 262ms | 69 KB | 44% | A$3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 252ms | 197 KB | 29% | A$3/mo | Costly |
www.rmit.edu.au www.rmit.edu.au | Other | 188ms | 44 KB | — | A$2/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 147ms | 135 KB | 29% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 126ms | 146 KB | 38% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 120ms | 146 KB | 39% | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 102ms | 173 KB | 37% | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 94ms | 147 KB | 39% | A$1/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 90ms | 110 KB | 52% | A$1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 77ms | 97 KB | 32% | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 76ms | 142 KB | 39% | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 75ms | 137 KB | 39% | A$1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 70ms | 48 KB | — | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 63ms | 129 KB | 47% | A$1/mo | Optional |
www.rmit.edu.au www.rmit.edu.au | Other | 57ms | 160 KB | 69% | A$1/mo | Optional |
siteintercept.qualtrics.com siteintercept.qualtrics.com | Other | 56ms | 36 KB | — | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 130 KB | 47% | A$1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 286ms and costs ~A$4/month
- www.rmit.edu.au adds 262ms and costs ~A$3/month
- Google Tag Manager adds 252ms and costs ~A$3/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 286ms 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.rmit.edu.au takes 262ms 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 252ms 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
52% of analytics.tiktok.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
69% of www.rmit.edu.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