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.
5.76 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
11.57 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.11 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.100
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
7.59 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.
16.95 s
Page Load Progression
FPage Weight BudgetAction13.8 MB transferred, 111 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 CostAction5206ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.pitt.edu/ | 1311ms | 15ms | 1ms | 3rd |
| Unattributable | 1047ms | 15ms | 0ms | 3rd |
| https://www.pitt.edu/core/misc/drupal.init.js?v=10.6.6 | 932ms | 415ms | 0ms | 3rd |
| https://www.pitt.edu/themes/custom/pitt_25/js/gsap/dist/gsap.min.js?tdhrd4 | 456ms | 85ms | 19ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NXCGL72 | 443ms | 365ms | 68ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-TWWN6KT393&cx=c>m=4e64h1 | 405ms | 331ms | 72ms | 3rd |
| https://www.youtube.com/s/player/218d9d92/www-widgetapi.vflset/www-widgetapi.js | 170ms | 149ms | 7ms | 3rd |
| https://www.pitt.edu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 | 146ms | 100ms | 29ms | 3rd |
| https://www.pitt.edu/themes/custom/assets/fontawesome/css/all.min.css | 93ms | 0ms | 0ms | 3rd |
| https://www.pitt.edu/sites/default/files/css/css_KDfobDOoJKxkLgii_1BvywW_UyNhBvlBJg5FbCjX1i8.css?delta=4&language=en&theme=pitt_25_edu&include=eJyFkdFuwyAMRX-IgDRp37LHyAGXeDU4wtAs_fqyRtm6TtNe0PXxFcaXieG6ORYIlKOZRKrWAsurm0DxsY4sE_CgdeMnZ0JViKiPLEtA488YqEoZwXspgSS7L2VPRXLFHEwH6EJpC7CFd_jYQZaSgOmK5tR9sKJKQveg7YrTZ6n_GqzOlEwUiYyjV3S77OoNKvYx5WwSZZICOeKokNg91RZCJ2aBArHvN-vx4G9iW17axKQzBrNQrePLr9AOTKnnNVTiHtrBVqh-HjwUaYp84BFD--OWe2vuiw4zFhkuFFB-9PYpHpilVaNM_rz_qm5aMe36Qriqu582SWiMN3GOzCo | 92ms | 0ms | 0ms | 3rd |
Showing top 10 of 12 scripts
DJS BundlesAction61 scripts, 168 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-TWWN6KT393&cx=c>m=4e64h1 | 158 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-NXCGL72 | 139 KB | 60 KB (43%) | ✓ | 3rd |
| https://www.pitt.edu/themes/contrib/bootstrap5/dist/bootstrap/5.3.8/dist/js/bootstrap.bundle.js?v=5.3.8 | 56 KB | 42 KB (76%) | ✗ | 3rd |
| https://www.pitt.edu/modules/contrib/blazy/js/base/blazy.drupal.min.js?tdhrd4 | 2 KB | — | ✓ | 3rd |
| https://www.pitt.edu/modules/custom/miniorange_saml/js/dynamicPricing.js?v=10.6.6 | 2 KB | — | ✓ | 3rd |
| https://www.pitt.edu/modules/contrib/blazy/js/polyfill/blazy.classlist.min.js?tdhrd4 | 2 KB | — | ✓ | 3rd |
| https://www.pitt.edu/modules/contrib/blazy/js/polyfill/blazy.promise.min.js?tdhrd4 | 2 KB | — | ✓ | 3rd |
| https://www.pitt.edu/modules/contrib/blazy/js/polyfill/blazy.raf.min.js?tdhrd4 | 1 KB | — | ✓ | 3rd |
| https://www.pitt.edu/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 | 35 KB | — | ✓ | 3rd |
| https://www.pitt.edu/core/assets/vendor/once/once.min.js?v=1.0.1 | 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
DPage Weight InventoryAction111 resources · 13.8 MB · 168 KB savings availableFIX
~168.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 111 resources | 13.8 MiB | ||||||
FHTTP CachingActionNo cache headersFIX
No Cache-Control header
Adding a Cache-Control header can significantly improve repeat-visit performance.
BImage Optimization18 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
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 Loading11 fonts (1062 KB)PASS
Web fonts
11
1062 KB total
Render-blocking
0
of 11
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
- Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
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 ~433 KB and ~866 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 Waterfall111 requests over 4510msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.pitt.edu www.pitt.edu | Other | 1311ms | 17 KB | — | $17/mo | Costly |
Unattributable Unattributable | Other | 1047ms | 0 KB | — | $14/mo | Costly |
www.pitt.edu www.pitt.edu | Other | 932ms | 1 KB | — | $12/mo | Costly |
www.pitt.edu www.pitt.edu | Other | 456ms | 27 KB | — | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 443ms | 139 KB | 43% | $6/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 405ms | 158 KB | 42% | $5/mo | Costly |
www.youtube.com www.youtube.com | Other | 170ms | 11 KB | — | $2/mo | Optional |
www.pitt.edu www.pitt.edu | Other | 146ms | 35 KB | — | $2/mo | Optional |
www.pitt.edu www.pitt.edu | Other | 93ms | 125 KB | — | $1/mo | Optional |
www.pitt.edu www.pitt.edu | Other | 92ms | 135 KB | — | $1/mo | Optional |
www.pitt.edu www.pitt.edu | Other | 57ms | 10 KB | — | $1/mo | Optional |
www.pitt.edu www.pitt.edu | Other | 54ms | 6 KB | — | $1/mo | Optional |
These scripts may cost more than they're worth
- www.pitt.edu adds 1311ms and costs ~$17/month
- Unattributable adds 1047ms and costs ~$14/month
- www.pitt.edu adds 932ms and costs ~$12/month
- www.pitt.edu adds 456ms and costs ~$6/month
- Google Tag Manager adds 443ms and costs ~$6/month
- Google Tag Manager adds 405ms and costs ~$5/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.pitt.edu takes 1311ms 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 1047ms 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.pitt.edu takes 932ms 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.pitt.edu takes 456ms 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 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 405ms 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