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.
5.66 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
7.78 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.21 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.011
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.54 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.
26.28 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 BudgetAction2.9 MB transferred, 236 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
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
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.
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 CostAction4144ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| Unattributable | 712ms | 44ms | 0ms | 3rd |
| https://www.utdallas.edu/ | 661ms | 28ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W48BR57 | 492ms | 414ms | 58ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11425704145 | 375ms | 332ms | 36ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S5RECKWMRS&l=beehiveDataLayer | 295ms | 237ms | 46ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11371885090&cx=c>m=4e64k1 | 212ms | 176ms | 35ms | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 208ms | 117ms | 88ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-13720113&cx=c>m=4e64k1 | 192ms | 159ms | 32ms | 3rd |
| https://p237.utdallas.edu/script.js | 180ms | 155ms | 11ms | 3rd |
| https://sc-static.net/scevent.min.js | 155ms | 142ms | 7ms | 3rd |
Showing top 10 of 18 scripts
FJS BundlesAction64 scripts, 609 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-S5RECKWMRS&cx=c>m=4e64k1 | 175 KB | 111 KB (64%) | ✓ | 3rd |
| https://www.google.com/cse/static/element/dc329f57de078f5d/cse_element__en.js?usqp=CAM%3D | 103 KB | 70 KB (68%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-S5RECKWMRS&l=beehiveDataLayer | 175 KB | 67 KB (39%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W48BR57 | 187 KB | 65 KB (35%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11371885090&cx=c>m=4e64k1 | 145 KB | 63 KB (44%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-1010127458 | 144 KB | 62 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-11425704145 | 146 KB | 59 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=DC-13720113&cx=c>m=4e64k1 | 130 KB | 58 KB (45%) | ✓ | 3rd |
| https://connect.facebook.net/en_US/fbevents.js | 97 KB | 31 KB (32%) | ✓ | 3rd |
| https://www.utdallas.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 | 35 KB | 23 KB (66%) | ✓ | 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 InventoryAction236 resources · 2.9 MB · 609 KB savings availableFIX
~609.5 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 236 resources | 2.9 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization50 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 Loading12 fonts (284 KB)PASS
Web fonts
12
284 KB total
Render-blocking
0
of 12
Dominant font-display
swap
Most common across fonts
Font loading timeline
- 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 ~50 KB and ~100 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource Hints16 hints, 0 missing preconnectsPASS
Current Resource Hints
16 resource hints configured
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
Network Waterfall236 requests over 3490msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 712ms | 0 KB | — | $4/mo | Costly |
www.utdallas.edu www.utdallas.edu | Other | 661ms | 56 KB | — | $4/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 492ms | 187 KB | 35% | $3/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 375ms | 146 KB | 40% | $2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 295ms | 175 KB | 39% | $2/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 212ms | 145 KB | 44% | $1/mo | Costly |
Facebook Pixel connect.facebook.net | Advertising | 208ms | 97 KB | 32% | $1/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 192ms | 130 KB | 45% | $1/mo | Optional |
p237.utdallas.edu p237.utdallas.edu | Other | 180ms | 41 KB | — | $1/mo | Optional |
sc-static.net sc-static.net | Other | 155ms | 25 KB | — | $1/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 130ms | 45 KB | — | $1/mo | Optional |
LinkedIn Insight snap.licdn.com | Advertising | 105ms | 19 KB | — | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 90ms | 144 KB | 43% | $1/mo | Optional |
www.utdallas.edu www.utdallas.edu | Other | 90ms | 35 KB | 66% | $1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 68ms | 175 KB | 64% | $0/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 65ms | 21 KB | — | $0/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 64ms | 19 KB | — | $0/mo | Optional |
Facebook Pixel connect.facebook.net | Advertising | 51ms | 17 KB | — | $0/mo | Optional |
These scripts may cost more than they're worth
- Unattributable adds 712ms and costs ~$4/month
- www.utdallas.edu adds 661ms and costs ~$4/month
- Google Tag Manager adds 492ms and costs ~$3/month
- Google Tag Manager adds 375ms and costs ~$2/month
- Google Tag Manager adds 295ms and costs ~$2/month
- Google Tag Manager adds 212ms and costs ~$1/month
- Facebook Pixel adds 208ms and costs ~$1/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 712ms 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.utdallas.edu takes 661ms 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 492ms 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 375ms 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 295ms 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 212ms 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 208ms 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
66% of www.utdallas.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