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.
8.04 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
12.36 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
495 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
1.046
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
8.04 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.
12.41 s
Page Load Progression
DPage Weight InventoryAction56 resources · 1.9 MB · 119 KB savings availableFIX
~118.6 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 56 resources | 1.9 MiB | ||||||
CPage Weight BudgetAction1.9 MB transferred, 56 requestsREVIEW
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
BThird-Party Impact60% third-party, 0 ms blockingREVIEW
CImage OptimizationAction6 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
CJS Execution CostAction1960ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://use.fontawesome.com/releases/v6.4.2/js/all.js | 443ms | 94ms | 192ms | 3rd |
| https://ku.edu/libraries/ku-web-styleguide/dist/main.min.js?tduv00 | 393ms | 34ms | 12ms | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-0X0JW8DT0Z | 324ms | 254ms | 64ms | 3rd |
| Unattributable | 249ms | 7ms | 0ms | 3rd |
| https://ku.edu/ | 166ms | 5ms | 1ms | 1st |
| https://use.fontawesome.com/releases/v6.4.2/js/v4-shims.js | 130ms | 65ms | 4ms | 3rd |
| https://ku.edu/sites/ku_new_homepage/files/js/js_-gR3l9yhuvupogSh60cy4KkyU9KXbpn14N3rk7gqxnA.js?scope=footer&delta=0&language=en&theme=borzoi&include=eJx9jtEOwjAIRX-otvGLCKuMdXZDganz611cNIsaX8jhHkgumpFDGXvKLpp6i62Ik4JJLlihZBnfOuDXtdIgF4JiUIWZDouEPbQqA0xa4TyRzj_erKITnMrIP6STeWhE71JSFqUX8-GkoZXR8UomA6UNR7vwPxetK0NgEa4Ejpx4GZ97xB5v4Tgt1bCSuqUNr7kRau6e-W7lWEujqPMDq0OCHQ | 101ms | 68ms | 2ms | 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 | 79ms | 60ms | 10ms | 1st |
| https://ku.edu/sites/ku_new_homepage/files/css/css_jHZKheemfUxsOfHmvCE4dveiXUVHSYwfsbYAEowQc5I.css?delta=1&language=en&theme=borzoi&include=eJx1kEFywzAIRS_k2pt2ehwGSURWLAsPoCTu6Ss5TbtxV2JAn_8-qEoGqVzJG8vkVcdLesBSwXHY4R3SGgFL-O189s6AJzJmIwFlnzBD8lxAbc8EfCORFEjPVDHdCIz7-pVKPSSpnBrETAXMzJ0Nl2rUyDASRMyZZAfP7fWWGsjKoTHdU7AZWryzBRuaJL8AhpC6pv23O-FySv0T8hn57IPRunUnaBubbWzzw13hGmcUtf9ELNjRF2oULPDRbsPZoYCrZi3J1vlKBKFQPYXBsXxxmjwLveoLF9Ohd6YgdcM84hUfw3EhJRQ_T71-e9ZjTq57DhsKRsFt1pfsrzPWslWXk87NUndtpJNDpW-lPuSR | 76ms | 0ms | 0ms | 1st |
BJS Bundles18 scripts, 119 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 | 35 KB | 25 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 | 496 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 | 6 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 | 10 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 | 35 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+Font Loading16 fonts (403 KB)PASS
Web fonts
16
403 KB total
Render-blocking
0
of 16
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 Hints6 hints, 0 missing preconnectsPASS
Current Resource Hints
6 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall56 requests over 1503msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
use.fontawesome.com use.fontawesome.com | Other | 443ms | 496 KB | — | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 324ms | 174 KB | 41% | $4/mo | Costly |
Unattributable Unattributable | Other | 249ms | 0 KB | — | $3/mo | Costly |
use.fontawesome.com use.fontawesome.com | Other | 130ms | 9 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- use.fontawesome.com adds 443ms and costs ~$6/month
- Google Tag Manager adds 324ms and costs ~$4/month
- Unattributable adds 249ms and costs ~$3/month
58% 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
use.fontawesome.com takes 443ms 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 324ms 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 249ms 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