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.
1.97 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.56 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
367 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
1.898
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
3.35 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.
6.03 s
Page Load Progression
656 ms 1.3 s
2.0 s
2.6 s
3.3 s 3.9 s 4.6 s
5.2 sFPage Weight BudgetAction4.3 MB transferred, 185 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
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 CostAction2500ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 517ms | 105ms | 0ms | 3rd |
| https://assets.adobedtm.com/84fa4ed6cd2d/93f43475a61e/launch-a9ab0e6066cc.min.js | 460ms | 397ms | 33ms | 3rd |
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.js | 450ms | 255ms | 32ms | 3rd |
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-chunk-all-components-frontend-svelte-js.b9124dec.js | 258ms | 174ms | 48ms | 3rd |
| https://www.sydney.edu.au/ | 245ms | 56ms | 0ms | 3rd |
| https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 182ms | 135ms | 40ms | 3rd |
| https://connect.facebook.net/signals/config/552355808300694?v=2.9.303&r=stable&domain=www.sydney.edu.au&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 103ms | 91ms | 10ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOA.js | 97ms | 79ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16460194664 | 74ms | 63ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-14331375 | 60ms | 30ms | 30ms | 3rd |
Showing top 10 of 11 scripts
FJS BundlesAction63 scripts, 1.3 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-chunk-all-components-frontend-svelte-js.b9124dec.js | 255 KB | 240 KB (94%) | ✓ | 3rd |
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.a6e2a76740ba945a80caac9d44ea5e22.js | 215 KB | 165 KB (77%) | ✗ | 3rd |
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/corporate-search.a6e2a76740ba945a80caac9d44ea5e22.js | 1 KB | 165 KB (77%) | ✗ | 3rd |
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.js | 218 KB | 151 KB (69%) | ✓ | 3rd |
| https://www.sydney.edu.au/etc.clientlibs/corporate-commons/clientlibs/wup-new-page-corporate-frontend-svelte-js.982a02b02f679df8eafac1b6a6e4fc85.js | 1 KB | 151 KB (69%) | ✓ | 3rd |
| https://cdn.ketchjs.com/ketchtag/stable/v2.12/ketch-sdk.js | 257 KB | 117 KB (45%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOA.js | 118 KB | 64 KB (54%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-14331375 | 180 KB | 62 KB (35%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-15089914 | 129 KB | 56 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-16460194664 | 138 KB | 51 KB (37%) | ✓ | 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 InventoryAction185 resources · 4.3 MB · 1.3 MB savings availableFIX
~1.3 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 185 resources | 4.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
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.
Performance issues directly impact user engagement and conversion rates.
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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading6 fonts (182 KB)PASS
Web fonts
6
182 KB total
Render-blocking
0
of 6
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 Waterfall185 requests over 4825msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 517ms | 0 KB | — | A$9/mo | Costly |
assets.adobedtm.com assets.adobedtm.com | Other | 460ms | 141 KB | 20% | A$8/mo | Costly |
www.sydney.edu.au www.sydney.edu.au | Other | 450ms | 1 KB | 69% | A$8/mo | Costly |
www.sydney.edu.au www.sydney.edu.au | Other | 258ms | 255 KB | 94% | A$4/mo | Costly |
www.sydney.edu.au www.sydney.edu.au | Other | 245ms | 10 KB | — | A$4/mo | Costly |
cdn.ketchjs.com cdn.ketchjs.com | Other | 182ms | 257 KB | 45% | A$3/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 103ms | 125 KB | 29% | A$2/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 97ms | 118 KB | 54% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 74ms | 138 KB | 37% | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 60ms | 180 KB | 35% | A$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 52ms | 129 KB | 44% | A$1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 517ms and costs ~A$9/month
- assets.adobedtm.com adds 460ms and costs ~A$8/month
- www.sydney.edu.au adds 450ms and costs ~A$8/month
- www.sydney.edu.au adds 258ms and costs ~A$4/month
- www.sydney.edu.au adds 245ms 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 517ms 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
assets.adobedtm.com takes 460ms 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.sydney.edu.au takes 450ms 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
69% of www.sydney.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
www.sydney.edu.au 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
94% of www.sydney.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
www.sydney.edu.au takes 245ms 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
54% 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