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.
4.43 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.31 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.971
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
13.94 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.
34.50 s
Page Load Progression
FPage Weight BudgetAction5.2 MB transferred, 154 requestsFIX
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
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
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
FJS Execution CostAction7536ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.uwa.edu.au/home | 2050ms | 9ms | 5ms | 3rd |
| Unattributable | 825ms | 83ms | 0ms | 3rd |
| https://www.uwa.edu.au/_next/static/chunks/862.c3bf0b1c834f59ed.js?dpl=dpl_7tBuqLGahnT6xxbYrGJGUgMhQR5f | 816ms | 619ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N397MQR | 665ms | 587ms | 58ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FQKYCDD16S&cx=c>m=4e64h1 | 438ms | 265ms | 34ms | 3rd |
| https://www.uwa.edu.au/_next/static/chunks/framework-de98b93a850cfc71.js?dpl=dpl_7tBuqLGahnT6xxbYrGJGUgMhQR5f | 329ms | 284ms | 13ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-10979345866&cx=c>m=4e64h1 | 290ms | 258ms | 30ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-3TZVGFFX6H&cx=c>m=4e64h1 | 258ms | 214ms | 40ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-886292W0J6&cx=c>m=4e64h1 | 235ms | 194ms | 38ms | 3rd |
| https://scripts.clarity.ms/0.8.60-beta/clarity.js | 230ms | 204ms | 7ms | 3rd |
Showing top 10 of 20 scripts
FJS BundlesAction41 scripts, 710 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.uwa.edu.au/_next/static/chunks/905-592e6859982e2f85.js?dpl=dpl_7tBuqLGahnT6xxbYrGJGUgMhQR5f | 131 KB | 91 KB (70%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-886292W0J6&cx=c>m=4e64h1 | 174 KB | 71 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-3TZVGFFX6H&cx=c>m=4e64h1 | 172 KB | 67 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-84TWJYTGPY&cx=c>m=4e64h1 | 157 KB | 67 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-FQKYCDD16S&cx=c>m=4e64h1 | 157 KB | 64 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-10979345866&cx=c>m=4e64h1 | 145 KB | 62 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-9815668&cx=c>m=4e64h1 | 129 KB | 57 KB (44%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 110 KB | 56 KB (51%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-N397MQR | 199 KB | 52 KB (26%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 34 KB (36%) | ✓ | 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 InventoryAction154 resources · 5.2 MB · 710 KB savings availableFIX
~710.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 154 resources | 5.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction51 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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading5 fonts (341 KB)PASS
Web fonts
5
341 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- 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 ~108 KB and ~216 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints29 hints, 0 missing preconnectsPASS
Current Resource Hints
29 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Network Waterfall154 requests over 7493msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.uwa.edu.au www.uwa.edu.au | Other | 2050ms | 32 KB | — | A$35/mo | Costly |
Unattributable Unattributable | Other | 825ms | 0 KB | — | A$14/mo | Costly |
www.uwa.edu.au www.uwa.edu.au | Other | 816ms | 0 KB | — | A$14/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 665ms | 199 KB | 26% | A$11/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 438ms | 157 KB | 41% | A$8/mo | Costly |
www.uwa.edu.au www.uwa.edu.au | Other | 329ms | 60 KB | 34% | A$6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 290ms | 145 KB | 43% | A$5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 258ms | 172 KB | 39% | A$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 235ms | 174 KB | 41% | A$4/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 230ms | 25 KB | — | A$4/mo | Costly |
analytics.tiktok.com analytics.tiktok.com | Other | 222ms | 110 KB | 51% | A$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 214ms | 157 KB | 42% | A$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 194ms | 129 KB | 44% | A$3/mo | Optional |
www.uwa.edu.au www.uwa.edu.au | Other | 181ms | 1 KB | — | A$3/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 148ms | 45 KB | — | A$3/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 126ms | 97 KB | 36% | A$2/mo | Optional |
sc-static.net sc-static.net | Other | 116ms | 25 KB | — | A$2/mo | Optional |
www.uwa.edu.au www.uwa.edu.au | Other | 93ms | 41 KB | — | A$2/mo | Optional |
d1mj578wat5n4o.cloudfront.net d1mj578wat5n4o.cloudfront.net | Other | 54ms | 7 KB | — | A$1/mo | Optional |
www.uwa.edu.au www.uwa.edu.au | Other | 53ms | 131 KB | 70% | A$1/mo | Optional |
These scripts may cost more than they're worth
- www.uwa.edu.au adds 2050ms and costs ~A$35/month
- Unattributable adds 825ms and costs ~A$14/month
- www.uwa.edu.au adds 816ms and costs ~A$14/month
- Google Tag Manager adds 665ms and costs ~A$11/month
- Google Tag Manager adds 438ms and costs ~A$8/month
- www.uwa.edu.au adds 329ms and costs ~A$6/month
- Google Tag Manager adds 290ms and costs ~A$5/month
- Google Tag Manager adds 258ms and costs ~A$4/month
- Google Tag Manager adds 235ms and costs ~A$4/month
- Microsoft Clarity adds 230ms and costs ~A$4/month
- analytics.tiktok.com adds 222ms and costs ~A$4/month
- Google Tag Manager adds 214ms 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
www.uwa.edu.au takes 2050ms 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 825ms 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.uwa.edu.au takes 816ms 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 665ms 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 438ms 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.uwa.edu.au takes 329ms 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 290ms 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 258ms 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 235ms 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 230ms 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
analytics.tiktok.com takes 222ms 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
51% 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
Google Tag Manager takes 214ms 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
70% of www.uwa.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