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.
889 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
2.10 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
6 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.009
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
1.26 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.
2.33 s
Page Load Progression
FPage Weight BudgetAction2.7 MB transferred, 60 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
DPage Weight InventoryAction60 resources · 2.7 MB · 122 KB savings availableFIX
~121.8 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 60 resources | 2.7 MiB | ||||||
BThird-Party Impact42% third-party, 0 ms blockingREVIEW
CImage OptimizationAction9 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
BJS Bundles18 scripts, 122 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-0X0JW8DT0Z | 174 KB | 71 KB (41%) | ✓ | 3rd |
| https://ku.edu/libraries/ku-web-styleguide/dist/main.min.js?tduv00 | 40 KB | 28 KB (71%) | ✓ | 1st |
| https://cdn.datatables.net/1.10.20/js/jquery.dataTables.min.js | 27 KB | 23 KB (84%) | ✓ | 3rd |
| https://ku.edu/modules/contrib/kute_alerts/js/alerts.js?tduv00 | 3 KB | — | ✓ | 1st |
| https://use.fontawesome.com/releases/v6.4.2/js/all.js | 495 KB | — | ✓ | 3rd |
| https://ku.edu/modules/contrib/google_tag/js/gtag.js?tduv00 | 1 KB | — | ✓ | 1st |
| https://webmedia.ku.edu/cookie-consent/cookie-consent.js | 7 KB | — | ✗ | 3rd |
| https://ku.edu/sites/ku_new_homepage/files/js/js_GfR71gdgezQHvA1CGMkEbbC-9bDAT5BDXNp-lQ0ZUMw.js?scope=footer&delta=4&language=en&theme=borzoi&include=eJx9jtEOwjAIRX-otvGLCKuMdXZDganz611cNIsaX8jhHkgumpFDGXvKLpp6i62Ik4JJLlihZBnfOuDXtdIgF4JiUIWZDouEPbQqA0xa4TyRzj_erKITnMrIP6STeWhE71JSFqUX8-GkoZXR8UomA6UNR7vwPxetK0NgEa4Ejpx4GZ97xB5v4Tgt1bCSuqUNr7kRau6e-W7lWEujqPMDq0OCHQ | 11 KB | — | ✓ | 1st |
| https://ku.edu/sites/ku_new_homepage/files/js/js_z2reQiP6ikyzJkettoVqfKrsjSSHMwTpybDld8QN4vg.js?scope=header&delta=0&language=en&theme=borzoi&include=eJx9jtEOwjAIRX-otvGLCKuMdXZDganz611cNIsaX8jhHkgumpFDGXvKLpp6i62Ik4JJLlihZBnfOuDXtdIgF4JiUIWZDouEPbQqA0xa4TyRzj_erKITnMrIP6STeWhE71JSFqUX8-GkoZXR8UomA6UNR7vwPxetK0NgEa4Ejpx4GZ97xB5v4Tgt1bCSuqUNr7kRau6e-W7lWEujqPMDq0OCHQ | 39 KB | — | ✓ | 1st |
| https://ku.edu/sites/ku_new_homepage/files/js/js_nkMpvYKGyrDDPNkrXvFQmc12M4MfPOvxLAeyHW9IrpE.js?scope=footer&delta=6&language=en&theme=borzoi&include=eJx9jtEOwjAIRX-otvGLCKuMdXZDganz611cNIsaX8jhHkgumpFDGXvKLpp6i62Ik4JJLlihZBnfOuDXtdIgF4JiUIWZDouEPbQqA0xa4TyRzj_erKITnMrIP6STeWhE71JSFqUX8-GkoZXR8UomA6UNR7vwPxetK0NgEa4Ejpx4GZ97xB5v4Tgt1bCSuqUNr7kRau6e-W7lWEujqPMDq0OCHQ | 2 KB | — | ✓ | 1st |
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
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
BHTTP Cachingmust-revalidate, no-cache, privateREVIEW
must-revalidate, no-cache, private
| Directive | Value | Meaning |
|---|---|---|
| must-revalidate | — | Must recheck with server after expiry |
| no-cache | — | Cache but always revalidate first |
| private | — | Only browser cache, not CDN/proxy |
A+Text CompressionAll text resources are compressedPASS
A+JS Execution Cost471ms total JS executionPASS
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://ku.edu/ | 246ms | 2ms | 0ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-0X0JW8DT0Z | 84ms | 66ms | 16ms | 3rd |
| Unattributable | 74ms | 2ms | 0ms | 3rd |
| https://use.fontawesome.com/releases/v6.4.2/js/all.js | 68ms | 19ms | 46ms | 3rd |
A+Font Loading17 fonts (418 KB)PASS
Web fonts
17
418 KB total
Render-blocking
0
of 17
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 Waterfall60 requests over 1140msINFO
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 | 84ms | 174 KB | 41% | $1/mo | Optional |
Unattributable Unattributable | Other | 74ms | 0 KB | — | $1/mo | Optional |
use.fontawesome.com use.fontawesome.com | Other | 68ms | 495 KB | — | $1/mo | Optional |
48% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac