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.
687 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
3.22 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
12 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.002
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
2.28 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.
4.78 s
Page Load Progression
FPage Weight BudgetAction14.2 MB transferred, 96 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
DThird-Party ImpactAction66% third-party, 0 ms blockingFIX
DJS BundlesAction14 scripts, 364 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://tulane.edu/sites/default/files/js/js_4tQX1qY8CISbXz-c62wz543U9va-TfMcnlvRK6JBpO4.js?scope=footer&delta=0&language=en&theme=tulane_tailwindcss&include=eJxtjUEKhDAQBD-UNU8KbRykdZyEnQnL_l7BgxdPBVWHAjNYVm0zNMkotbWdcuHoSliV_CaTB4IerJ6X7-jQ6TEphsKkBKg_2lLdM7TTZHtt9_zj8VfaegJa1Tm- | 244 KB | 163 KB (67%) | ✓ | 1st |
| https://www.googletagmanager.com/gtag/js?id=G-DQL0R37F2R&cx=c>m=4e64h1h1 | 172 KB | 69 KB (40%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W9ZD83 | 189 KB | 68 KB (36%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-LXRZER7JKG&cx=c>m=4e64h1h1 | 153 KB | 64 KB (42%) | ✓ | 3rd |
| https://snapwidget.com/js/vendor/iframeResizer.contentWindow.min.0da4d54c7d115e53.js | 6 KB | — | ✓ | 3rd |
| https://snapwidget.com/js/embed.main.min.b26dca6d8591e5b3.js | 1 KB | — | ✓ | 3rd |
| https://tulane.edu/sites/default/files/google_tag/tulane_universal_container/google_tag.script.js?tduwxb | 1 KB | — | ✓ | 1st |
| https://snapwidget.com/js/embed.vendor.min.2f17f0b14ee46c5a.js | 1 KB | — | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-E8WQDE3S74 | 156 KB | — | ✓ | 3rd |
| https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 | 11 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
DPage Weight InventoryAction96 resources · 14.2 MB · 364 KB savings availableFIX
~364.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 96 resources | 14.2 MiB | ||||||
CImage OptimizationAction22 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
BJS Execution Cost608ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://tulane.edu/sites/default/files/js/js_4tQX1qY8CISbXz-c62wz543U9va-TfMcnlvRK6JBpO4.js?scope=footer&delta=0&language=en&theme=tulane_tailwindcss&include=eJxtjUEKhDAQBD-UNU8KbRykdZyEnQnL_l7BgxdPBVWHAjNYVm0zNMkotbWdcuHoSliV_CaTB4IerJ6X7-jQ6TEphsKkBKg_2lLdM7TTZHtt9_zj8VfaegJa1Tm- | 162ms | 79ms | 14ms | 1st |
| Unattributable | 130ms | 3ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-W9ZD83 | 84ms | 69ms | 13ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-DQL0R37F2R&cx=c>m=4e64h1h1 | 72ms | 61ms | 10ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-LXRZER7JKG&cx=c>m=4e64h1h1 | 55ms | 46ms | 9ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 53ms | 48ms | 2ms | 3rd |
| https://tulane.edu/ | 52ms | 1ms | 0ms | 1st |
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 Loading4 fonts (378 KB)PASS
Web fonts
4
378 KB total
Render-blocking
0
of 4
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
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 ~165 KB and ~330 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP Cachingmax-age=10800 (3 hours)PASS
max-age=10800, public
| Directive | Value | Meaning |
|---|---|---|
| max-age | 10800 | Cache for 3 hours |
| public | — | Any cache may store this response |
Network Waterfall96 requests over 1556msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 130ms | 0 KB | — | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 84ms | 189 KB | 36% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 72ms | 172 KB | 40% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 55ms | 153 KB | 42% | €1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 53ms | 26 KB | — | €1/mo | Optional |
65% of JavaScript execution time comes from third-party scripts.
Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.
Learn more ▾ ▴
Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.
Source: web.dev / HTTP Archive Web Almanac