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.
2.92 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.25 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
191 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.
4.48 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.
11.43 s
Page Load Progression
FPage Weight BudgetAction11.8 MB transferred, 149 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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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 BundlesAction53 scripts, 4.1 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://uoa-assistant.auckland.ac.nz/build/assets/servicedesk.bundle.js | 2208 KB | 1342 KB (61%) | ✗ | 3rd |
| https://us-south.watson-orchestrate.cloud.ibm.com/wxochat/static/js/vendors.902b0a5e.js | 1116 KB | 807 KB (73%) | ✓ | 3rd |
| https://us-south.watson-orchestrate.cloud.ibm.com/wxochat/static/js/carbon-products-vendors.49b718a5.js | 547 KB | 512 KB (94%) | ✓ | 3rd |
| https://us-south.watson-orchestrate.cloud.ibm.com/wxochat/static/js/carbon-icons-vendors.b39373d5.js | 471 KB | 441 KB (94%) | ✓ | 3rd |
| https://us-south.watson-orchestrate.cloud.ibm.com/wxochat/static/js/app.9972a023.js | 453 KB | 179 KB (44%) | ✓ | 3rd |
| https://us-south.watson-orchestrate.cloud.ibm.com/wxochat/static/js/carbon-vendors.b26cddc4.js | 156 KB | 96 KB (61%) | ✓ | 3rd |
| https://uoa-assistant.auckland.ac.nz/build/p-74ee9601.entry.js | 141 KB | 81 KB (57%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-JSL8JE8FRZ&cx=c>m=4e64h1 | 151 KB | 75 KB (50%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-48M2ES9DC2&cx=c>m=4e64h1 | 176 KB | 70 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SJ5FRP7YTL&cx=c>m=4e64k0h2 | 172 KB | 69 KB (40%) | ✓ | 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 InventoryAction149 resources · 11.8 MB · 4.1 MB savings availableFIX
~4.1 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 149 resources | 11.8 MiB | ||||||
CImage OptimizationAction47 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
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
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
CJS Execution CostAction1804ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://us-south.watson-orchestrate.cloud.ibm.com/wxochat/static/js/vendors.902b0a5e.js | 409ms | 313ms | 80ms | 3rd |
| https://www.auckland.ac.nz/en.html | 229ms | 3ms | 0ms | 3rd |
| Unattributable | 223ms | 16ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W9ZVGXV | 177ms | 153ms | 16ms | 3rd |
| https://assets.adobedtm.com/8f0d8ca959df/1c5999aedcfa/launch-b026ed5e40af.min.js | 159ms | 142ms | 5ms | 3rd |
| https://uoa-assistant.auckland.ac.nz/build/assets/servicedesk.bundle.js | 121ms | 71ms | 45ms | 3rd |
| https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwOQ.js | 108ms | 73ms | 33ms | 3rd |
| https://www.auckland.ac.nz/etc.clientlibs/uoa-digital/clientlibs/templates/homepage.lc-65467f98324e3d8bd2c1a6bc356c14a9-lc.min.js | 76ms | 36ms | 5ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-48M2ES9DC2&cx=c>m=4e64h1 | 69ms | 55ms | 14ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-SJ5FRP7YTL&cx=c>m=4e64k0h2 | 66ms | 55ms | 10ms | 3rd |
Showing top 10 of 13 scripts
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 Loading8 fonts (976 KB)PASS
Web fonts
8
976 KB total
Render-blocking
0
of 8
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
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- 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 ~418 KB and ~836 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
AHTTP Cachingmax-age=300 (5 minutes)PASS
max-age=300
| Directive | Value | Meaning |
|---|---|---|
| max-age | 300 | Cache for 5 minutes |
Network Waterfall149 requests over 5234msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
us-south.watson-orchestrate.cloud.ibm.com us-south.watson-orchestrate.cloud.ibm.com | Other | 409ms | 1116 KB | 73% | NZ$6/mo | Costly |
www.auckland.ac.nz www.auckland.ac.nz | Other | 229ms | 23 KB | — | NZ$3/mo | Costly |
Unattributable Unattributable | Other | 223ms | 0 KB | — | NZ$3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 177ms | 192 KB | 27% | NZ$3/mo | Optional |
assets.adobedtm.com assets.adobedtm.com | Other | 159ms | 76 KB | 38% | NZ$2/mo | Optional |
uoa-assistant.auckland.ac.nz uoa-assistant.auckland.ac.nz | Other | 121ms | 2208 KB | 61% | NZ$2/mo | Optional |
analytics.tiktok.com analytics.tiktok.com | Other | 108ms | 122 KB | 55% | NZ$2/mo | Optional |
www.auckland.ac.nz www.auckland.ac.nz | Other | 76ms | 66 KB | 72% | NZ$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 69ms | 176 KB | 40% | NZ$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 66ms | 172 KB | 40% | NZ$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 61ms | 129 KB | 51% | NZ$1/mo | Optional |
us-south.watson-orchestrate.cloud.ibm.com us-south.watson-orchestrate.cloud.ibm.com | Other | 55ms | 453 KB | 44% | NZ$1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 51ms | 143 KB | 44% | NZ$1/mo | Optional |
These scripts may cost more than they're worth
- us-south.watson-orchestrate.cloud.ibm.com adds 409ms and costs ~NZ$6/month
- www.auckland.ac.nz adds 229ms and costs ~NZ$3/month
- Unattributable adds 223ms and costs ~NZ$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
us-south.watson-orchestrate.cloud.ibm.com takes 409ms 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
73% of us-south.watson-orchestrate.cloud.ibm.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
www.auckland.ac.nz takes 229ms 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 223ms 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
61% of uoa-assistant.auckland.ac.nz'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
55% 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
72% of www.auckland.ac.nz'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
51% 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