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.
1.96 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.84 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
7 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.570
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.60 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.
4.32 s
Page Load Progression
FPage Weight BudgetAction3.9 MB transferred, 109 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
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
DPage Weight InventoryAction109 resources · 3.9 MB · 166 KB savings availableFIX
~166.3 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 109 resources | 3.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization23 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
BJS Execution Cost804ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.uab.edu/home/ | 406ms | 10ms | 2ms | 3rd |
| Unattributable | 209ms | 23ms | 0ms | 3rd |
| https://cdn.cookielaw.org/scripttemplates/6.39.0/otBannerSdk.js | 130ms | 67ms | 12ms | 3rd |
| https://cdn.cookielaw.org/consent/660b8afe-7011-433e-b4af-a7229d2202c5/OtAutoBlock.js | 59ms | 55ms | 2ms | 3rd |
CJS BundlesAction24 scripts, 166 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__en.js?usqp=CAI%3D | 98 KB | 49 KB (50%) | ✓ | 3rd |
| https://cdn.cookielaw.org/scripttemplates/6.39.0/otBannerSdk.js | 89 KB | 46 KB (52%) | ✓ | 3rd |
| https://www.uab.edu/home/media/com_widgetkit/lib/uikit/dist/js/uikit.min.js | 51 KB | 40 KB (78%) | ✓ | 3rd |
| https://cse.google.com/adsense/search/async-ads.js | 44 KB | 32 KB (73%) | ✓ | 3rd |
| https://cse.google.com/cse.js?cx=934f5599a8cbf6f31 | 4 KB | — | ✓ | 3rd |
| https://www.uab.edu/home/media/com_widgetkit/js/maps.js | 6 KB | — | ✓ | 3rd |
| https://www.uab.edu/home/media/system/js/core.min.js?a3d8f8 | 4 KB | — | ✓ | 3rd |
| https://www.uab.edu/home/media/system/js/messages.min.js?9a4811 | 2 KB | — | ✓ | 3rd |
| https://www.uab.edu/home/media/plg_system_jcemediabox/js/jcemediabox.min.js?7d30aa8b30a57b85d658fcd54426884a | 17 KB | — | ✓ | 3rd |
| https://www.uab.edu/home/media/legacy/js/jquery-noconflict.min.js?504da4 | 0 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
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 Loading26 fonts (292 KB)PASS
Web fonts
26
292 KB total
Render-blocking
0
of 26
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 Waterfall109 requests over 11636msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.uab.edu www.uab.edu | Other | 406ms | 32 KB | — | $5/mo | Costly |
Unattributable Unattributable | Other | 209ms | 0 KB | — | $3/mo | Costly |
OneTrust cdn.cookielaw.org | Consent | 130ms | 89 KB | 52% | $2/mo | Essential |
OneTrust cdn.cookielaw.org | Consent | 59ms | 11 KB | — | $1/mo | Essential |
These scripts may cost more than they're worth
- www.uab.edu adds 406ms and costs ~$5/month
- Unattributable adds 209ms and costs ~$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
www.uab.edu takes 406ms 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 209ms 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 OneTrust'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