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.
6.33 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.54 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
2.52 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.110
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
9.98 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.
39.44 s
Page Load Progression
FPage Weight BudgetAction6.3 MB transferred, 158 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
FJS Execution CostAction8235ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtm.js?id=GTM-5X3JVKL | 1130ms | 984ms | 90ms | 3rd |
| Unattributable | 906ms | 123ms | 0ms | 3rd |
| https://www.qut.edu.au/ | 829ms | 71ms | 14ms | 3rd |
| https://www.qut.edu.au/__data/assets/js_file_folder/0008/634715/QUT-2017-Javascript-Folder.min.js?v=0.3.1700 | 792ms | 575ms | 130ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X89KR96J52&cx=c>m=4e64k0 | 432ms | 305ms | 40ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S1B55LT1H8&cx=c>m=4e64k0 | 307ms | 236ms | 63ms | 3rd |
| https://www.qut.edu.au/__data/assets/js_file/0010/1112032/swiper-bundle.js | 278ms | 65ms | 26ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 266ms | 202ms | 12ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js | 252ms | 209ms | 39ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-721628519&cx=c>m=4e64k0 | 230ms | 184ms | 44ms | 3rd |
Showing top 10 of 31 scripts
FJS BundlesAction54 scripts, 1.5 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.qut.edu.au/__data/assets/js_file_folder/0008/634715/QUT-2017-Javascript-Folder.min.js?v=0.3.1700 | 330 KB | 244 KB (74%) | ✗ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOA.js | 117 KB | 91 KB (78%) | ✓ | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMQ.js | 110 KB | 85 KB (78%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11333774988&cx=c>m=4e64k0 | 144 KB | 82 KB (57%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-946207694&cx=c>m=4e64k0 | 144 KB | 82 KB (57%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11106195426&cx=c>m=4e64k0 | 147 KB | 82 KB (56%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1016511385&cx=c>m=4e64k0 | 138 KB | 80 KB (58%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-13706412&cx=c>m=4e64k0 | 129 KB | 75 KB (58%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-12669389&cx=c>m=4e64k0 | 129 KB | 75 KB (58%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X89KR96J52&cx=c>m=4e64k0 | 173 KB | 71 KB (41%) | ✓ | 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 InventoryAction158 resources · 6.3 MB · 1.5 MB savings availableFIX
~1.5 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 158 resources | 6.3 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
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
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
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (99 KB)PASS
Web fonts
3
99 KB total
Render-blocking
0
of 3
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 Waterfall158 requests over 8136msINFO
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 | 1130ms | 190 KB | 28% | A$20/mo | Costly |
Unattributable Unattributable | Other | 906ms | 0 KB | — | A$16/mo | Costly |
www.qut.edu.au www.qut.edu.au | Other | 829ms | 28 KB | — | A$14/mo | Costly |
www.qut.edu.au www.qut.edu.au | Other | 792ms | 330 KB | 74% | A$14/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 432ms | 173 KB | 41% | A$7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 307ms | 158 KB | 42% | A$5/mo | Costly |
www.qut.edu.au www.qut.edu.au | Other | 278ms | 38 KB | 59% | A$5/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 266ms | 26 KB | — | A$5/mo | Costly |
analytics.tiktok.com analytics.tiktok.com | Other | 252ms | 122 KB | 52% | A$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 230ms | 137 KB | 44% | A$4/mo | Costly |
cdn.taboola.com cdn.taboola.com | Other | 217ms | 27 KB | — | A$4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 200ms | 146 KB | 40% | A$3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 176ms | 144 KB | 48% | A$3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 169ms | 144 KB | 57% | A$3/mo | Optional |
siteintercept.qualtrics.com siteintercept.qualtrics.com | Other | 162ms | 36 KB | 60% | A$3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 155ms | 144 KB | 57% | A$3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 150ms | 147 KB | 56% | A$3/mo | Optional |
sc-static.net sc-static.net | Other | 144ms | 25 KB | — | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 143ms | 138 KB | 58% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 141ms | 137 KB | 48% | A$2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 140ms | 97 KB | 37% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 136ms | 129 KB | 58% | A$2/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 133ms | 117 KB | 78% | A$2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 129ms | 129 KB | 58% | A$2/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 117ms | 110 KB | 78% | A$2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 107ms | 47 KB | 43% | A$2/mo | Optional |
siteintercept.qualtrics.com siteintercept.qualtrics.com | Other | 99ms | 14 KB | — | A$2/mo | Optional |
www.qut.edu.au www.qut.edu.au | Other | 89ms | 126 KB | — | A$2/mo | Optional |
LinkedIn Insight snap.licdn.com | Advertising | 88ms | 19 KB | — | A$2/mo | Optional |
www.redditstatic.com www.redditstatic.com | Other | 66ms | 19 KB | — | A$1/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 51ms | 40 KB | — | A$1/mo | Optional |
These scripts may cost more than they're worth
- Google Tag Manager adds 1130ms and costs ~A$20/month
- Unattributable adds 906ms and costs ~A$16/month
- www.qut.edu.au adds 829ms and costs ~A$14/month
- www.qut.edu.au adds 792ms and costs ~A$14/month
- Google Tag Manager adds 432ms and costs ~A$7/month
- Google Tag Manager adds 307ms and costs ~A$5/month
- www.qut.edu.au adds 278ms and costs ~A$5/month
- Microsoft Clarity adds 266ms and costs ~A$5/month
- analytics.tiktok.com adds 252ms and costs ~A$4/month
- Google Tag Manager adds 230ms and costs ~A$4/month
- cdn.taboola.com adds 217ms 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 1130ms 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 906ms 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.qut.edu.au takes 829ms 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.qut.edu.au takes 792ms 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
74% of www.qut.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
Google Tag Manager takes 432ms 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 307ms 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.qut.edu.au takes 278ms 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
59% of www.qut.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
Microsoft Clarity takes 266ms 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 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
Google Tag Manager 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
cdn.taboola.com takes 217ms 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
57% of Google Tag Manager'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
60% of siteintercept.qualtrics.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
57% of Google Tag Manager'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
56% of Google Tag Manager'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
58% of Google Tag Manager'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
58% of Google Tag Manager'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
78% 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
58% of Google Tag Manager'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
78% 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