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.
3.99 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
13.79 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.16 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.318
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
6.74 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.
44.47 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 BudgetAction7.2 MB transferred, 185 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
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
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
FJS Execution CostAction5343ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.unl.edu/ | 1126ms | 33ms | 2ms | 3rd |
| Unattributable | 1032ms | 63ms | 0ms | 3rd |
| https://mediahub.unl.edu/templates/iframe/js/vendor/jquery.min.js?v=51c855d | 534ms | 413ms | 8ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WKHNC39 | 461ms | 407ms | 43ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-XYGRJGQFZK | 446ms | 389ms | 53ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 237ms | 87ms | 117ms | 3rd |
| https://mediahub.unl.edu/templates/iframe/js/vendor/video.min.js?v=51c855d | 219ms | 150ms | 46ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11027044953&cx=c>m=4e64h1 | 190ms | 161ms | 27ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17881525003&cx=c>m=4e64h1 | 163ms | 135ms | 27ms | 3rd |
| https://z168.unl.edu/script.js | 159ms | 130ms | 9ms | 3rd |
Showing top 10 of 19 scripts
FJS BundlesAction93 scripts, 1.5 MB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://mediahub.unl.edu/templates/iframe/js/vendor/three.min.js?v=51c855d | 593 KB | 431 KB (73%) | ✓ | 3rd |
| https://mediahub.unl.edu/templates/iframe/js/vendor/video.min.js?v=51c855d | 670 KB | 342 KB (51%) | ✓ | 3rd |
| https://larue.unl.edu/main.js?v=6.0.11 | 219 KB | 145 KB (67%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-XYGRJGQFZK&cx=c>m=4e64h1 | 178 KB | 114 KB (64%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-XYGRJGQFZK | 178 KB | 66 KB (37%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WKHNC39 | 172 KB | 65 KB (38%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-17881525003&cx=c>m=4e64h1 | 144 KB | 64 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11027044953&cx=c>m=4e64h1 | 144 KB | 61 KB (43%) | ✓ | 3rd |
| https://ucommchat.unl.edu/assets/js?for=client&version=6.0&cb=2026421 | 84 KB | 60 KB (71%) | ✗ | 3rd |
| https://mediahub.unl.edu/templates/iframe/js/vendor/jquery.min.js?v=51c855d | 88 KB | 50 KB (58%) | ✓ | 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 InventoryAction185 resources · 7.2 MB · 1.5 MB savings availableFIX
~1.5 MiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 185 resources | 7.2 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization24 images, 0 KB saveableREVIEW
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 Loading13 fonts (668 KB)PASS
Web fonts
13
668 KB total
Render-blocking
0
of 13
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 Hints1 hints, 0 missing preconnectsPASS
Current Resource Hints
1 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall185 requests over 4146msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.unl.edu www.unl.edu | Other | 1126ms | 56 KB | — | $15/mo | Costly |
Unattributable Unattributable | Other | 1032ms | 0 KB | — | $14/mo | Costly |
mediahub.unl.edu mediahub.unl.edu | Other | 534ms | 88 KB | 58% | $7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 461ms | 172 KB | 38% | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 446ms | 178 KB | 37% | $6/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 237ms | 97 KB | 34% | $3/mo | Costly |
mediahub.unl.edu mediahub.unl.edu | Other | 219ms | 670 KB | 51% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 190ms | 144 KB | 43% | $3/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 163ms | 144 KB | 45% | $2/mo | Optional |
z168.unl.edu z168.unl.edu | Other | 159ms | 40 KB | — | $2/mo | Optional |
ucommchat.unl.edu ucommchat.unl.edu | Other | 133ms | 53 KB | 48% | $2/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 109ms | 44 KB | — | $1/mo | Optional |
sc-static.net sc-static.net | Other | 106ms | 25 KB | — | $1/mo | Optional |
cdnjs cdnjs.cloudflare.com | CDN | 103ms | 59 KB | 56% | $1/mo | Optional |
mediahub.unl.edu mediahub.unl.edu | Other | 76ms | 593 KB | 73% | $1/mo | Optional |
larue.unl.edu larue.unl.edu | Other | 69ms | 219 KB | 67% | $1/mo | Optional |
LinkedIn Insight snap.licdn.com | Advertising | 68ms | 19 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 59ms | 178 KB | 64% | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 53ms | 16 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.unl.edu adds 1126ms and costs ~$15/month
- Unattributable adds 1032ms and costs ~$14/month
- mediahub.unl.edu adds 534ms and costs ~$7/month
- Google Tag Manager adds 461ms and costs ~$6/month
- Google Tag Manager adds 446ms and costs ~$6/month
- Facebook Pixel adds 237ms and costs ~$3/month
- mediahub.unl.edu adds 219ms 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.unl.edu takes 1126ms 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 1032ms 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
mediahub.unl.edu takes 534ms 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
58% of mediahub.unl.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
Google Tag Manager takes 461ms 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 446ms 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
Facebook Pixel takes 237ms 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
mediahub.unl.edu takes 219ms 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
51% of mediahub.unl.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
56% of cdnjs'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
73% of mediahub.unl.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 larue.unl.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
64% of Google Tag Manager'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