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.
1.38 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.59 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
269 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.120
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.67 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.
6.30 s
Page Load Progression
FPage Weight BudgetAction9.9 MB transferred, 97 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS BundlesAction32 scripts, 539 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.aau.dk/_next/static/chunks/pages/_app-11d1e030853fd03c.js | 342 KB | 256 KB (76%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-N8738YD05W&cx=c>m=4e64k1 | 172 KB | 85 KB (49%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-K2LH48 | 174 KB | 81 KB (47%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-1387381&cx=c>m=4e64k1 | 131 KB | 74 KB (57%) | ✓ | 3rd |
| https://www.aau.dk/_next/static/chunks/7013-f2380881e1e9bd63.js | 57 KB | 43 KB (79%) | ✓ | 3rd |
| https://www.aau.dk/_next/static/chunks/webpack-f2fd430b743e5615.js | 8 KB | — | ✓ | 3rd |
| https://www.aau.dk/_next/static/chunks/main-6f119220507e615f.js | 41 KB | — | ✓ | 3rd |
| https://www.aau.dk/_next/static/chunks/1810.93b3159bb3cc6b1f.js | 4 KB | — | ✓ | 3rd |
| https://www.aau.dk/_next/static/chunks/5414.de5cc899cbd6df95.js | 5 KB | — | ✓ | 3rd |
| https://www.aau.dk/_next/static/chunks/7734.f42387635131d503.js | 4 KB | — | ✓ | 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 InventoryAction97 resources · 9.9 MB · 539 KB savings availableFIX
~538.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 97 resources | 9.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization26 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
CJS Execution CostAction1651ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.aau.dk/_next/static/chunks/framework-b0ec748c7a4c483a.js | 429ms | 363ms | 4ms | 3rd |
| https://policy.app.cookieinformation.com/latest/aau.dk/default.js | 242ms | 11ms | 109ms | 3rd |
| https://www.aau.dk/ | 226ms | 6ms | 0ms | 3rd |
| Unattributable | 226ms | 3ms | 0ms | 3rd |
| https://policy.app.cookieinformation.com/uc.js | 156ms | 29ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-K2LH48 | 155ms | 103ms | 20ms | 3rd |
| https://www.aau.dk/_next/static/chunks/pages/_app-11d1e030853fd03c.js | 138ms | 83ms | 37ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-N8738YD05W&cx=c>m=4e64k1 | 78ms | 61ms | 16ms | 3rd |
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 Loading7 fonts (179 KB)PASS
Web fonts
7
179 KB total
Render-blocking
0
of 7
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 Waterfall97 requests over 2923msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.aau.dk www.aau.dk | Other | 429ms | 47 KB | — | kr35/mo | Costly |
policy.app.cookieinformation.com policy.app.cookieinformation.com | Other | 242ms | 3591 KB | — | kr20/mo | Costly |
www.aau.dk www.aau.dk | Other | 226ms | 53 KB | — | kr18/mo | Costly |
Unattributable Unattributable | Other | 226ms | 0 KB | — | kr18/mo | Costly |
policy.app.cookieinformation.com policy.app.cookieinformation.com | Other | 156ms | 12 KB | — | kr13/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 155ms | 174 KB | 47% | kr13/mo | Optional |
www.aau.dk www.aau.dk | Other | 138ms | 342 KB | 76% | kr11/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 78ms | 172 KB | 49% | kr6/mo | Optional |
These scripts may cost more than they're worth
- www.aau.dk adds 429ms and costs ~kr35/month
- policy.app.cookieinformation.com adds 242ms and costs ~kr20/month
- www.aau.dk adds 226ms and costs ~kr18/month
- Unattributable adds 226ms and costs ~kr18/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.aau.dk takes 429ms 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
policy.app.cookieinformation.com takes 242ms 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.aau.dk takes 226ms 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 226ms 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
76% of www.aau.dk'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