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.
3.77 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
9.68 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.44 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.346
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
5.70 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.
17.19 s
Page Load Progression
375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s 2.6 s 3.0 sFPage Weight BudgetAction19.9 MB transferred, 119 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
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 Execution CostAction4020ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 887ms | 40ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MPL2XXQ | 610ms | 388ms | 199ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9N1R6EBX1J&cx=c>m=4e64h1 | 426ms | 374ms | 41ms | 3rd |
| https://www.udel.edu/ | 380ms | 22ms | 3ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZQG14CNXL3&cx=c>m=4e64h1 | 359ms | 314ms | 42ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-950353921&cx=c>m=4e64h1 | 222ms | 193ms | 27ms | 3rd |
| https://sc-static.net/scevent.min.js | 169ms | 156ms | 4ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-16807535372&cx=c>m=4e64h1 | 163ms | 122ms | 41ms | 3rd |
| https://go.discover.grad.udel.edu/mtc.js | 155ms | 107ms | 2ms | 3rd |
| https://connect.facebook.net/signals/config/2149752311747439?v=2.9.303&r=stable&domain=www.udel.edu&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168 | 148ms | 126ms | 22ms | 3rd |
Showing top 10 of 15 scripts
FJS BundlesAction34 scripts, 509 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.udel.edu/etc/designs/udel/clientlibs.min.js | 116 KB | 87 KB (75%) | ✗ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-16807535372&cx=c>m=4e64h1 | 145 KB | 69 KB (48%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-MPL2XXQ | 171 KB | 68 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-9N1R6EBX1J&cx=c>m=4e64h1 | 169 KB | 68 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-950353921&cx=c>m=4e64h1 | 147 KB | 61 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-ZQG14CNXL3&cx=c>m=4e64h1 | 174 KB | 60 KB (35%) | ✓ | 3rd |
| https://www.udel.edu/etc/designs/udel/common-clientlibs.min.js | 61 KB | 41 KB (67%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 32 KB (34%) | ✓ | 3rd |
| https://www.udel.edu/etc.clientlibs/clientlibs/granite/jquery.min.js | 36 KB | 23 KB (65%) | ✓ | 3rd |
| https://grad-admissions.udel.edu/ping | 1 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 InventoryAction119 resources · 19.9 MB · 509 KB savings availableFIX
~508.7 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 119 resources | 19.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
CImage OptimizationAction41 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
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 Loading5 fonts (198 KB)PASS
Web fonts
5
198 KB total
Render-blocking
0
of 5
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
- Convert to woff2 for ~30% smaller file size
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 ~31 KB and ~62 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall119 requests over 4374msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 887ms | 0 KB | — | $12/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 610ms | 171 KB | 40% | $8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 426ms | 169 KB | 40% | $6/mo | Costly |
www.udel.edu www.udel.edu | Other | 380ms | 15 KB | — | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 359ms | 174 KB | 35% | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 222ms | 147 KB | 41% | $3/mo | Costly |
sc-static.net sc-static.net | Other | 169ms | 25 KB | — | $2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 163ms | 145 KB | 48% | $2/mo | Optional |
go.discover.grad.udel.edu go.discover.grad.udel.edu | Other | 155ms | 4 KB | — | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 148ms | 46 KB | — | $2/mo | Optional |
www.udel.edu www.udel.edu | Other | 138ms | 116 KB | 75% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 121ms | 97 KB | 34% | $2/mo | Optional |
www.udel.edu www.udel.edu | Other | 102ms | 61 KB | 67% | $1/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 74ms | 21 KB | — | $1/mo | Optional |
www.udel.edu www.udel.edu | Other | 64ms | 36 KB | 65% | $1/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 887ms and costs ~$12/month
- Google Tag Manager adds 610ms and costs ~$8/month
- Google Tag Manager adds 426ms and costs ~$6/month
- www.udel.edu adds 380ms and costs ~$5/month
- Google Tag Manager adds 359ms and costs ~$5/month
- Google Tag Manager adds 222ms 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
Unattributable takes 887ms 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 610ms 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 426ms 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.udel.edu takes 380ms 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 359ms 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 222ms 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
75% of www.udel.edu'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
67% of www.udel.edu'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
65% of www.udel.edu'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