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.
349 ms
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
4.71 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
42 ms
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
0.073
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
681 ms
Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.
4.86 s
Page Load Progression
FPage Weight BudgetAction7.4 MB transferred, 68 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
CImage OptimizationAction19 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.
Performance issues directly impact user engagement and conversion rates.
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 Cost688ms total JS executionREVIEW
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://missouri.edu/ | 222ms | 4ms | 0ms | 1st |
| Unattributable | 162ms | 5ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1R84ZFX37M&cx=c>m=4e64h1h1 | 85ms | 68ms | 17ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PB763WT | 78ms | 52ms | 25ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X5WTGNM3XF&cx=c>m=4e64h1 | 78ms | 63ms | 15ms | 3rd |
| https://scripts.clarity.ms/0.8.60-beta/clarity.js | 62ms | 55ms | 2ms | 3rd |
CJS BundlesAction22 scripts, 284 KB unusedREVIEW
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.googletagmanager.com/gtag/js?id=G-1R84ZFX37M&cx=c>m=4e64h1h1 | 176 KB | 71 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-X5WTGNM3XF&cx=c>m=4e64h1 | 157 KB | 66 KB (42%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-5XMXM62J | 117 KB | 64 KB (55%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-PB763WT | 132 KB | 62 KB (47%) | ✓ | 3rd |
| https://static.addtoany.com/menu/modules/core.ydpp7jcu.js | 26 KB | 21 KB (82%) | ✓ | 3rd |
| https://missouri.edu/sites/default/files/js/js_ZD5FJfCj1LiFYKrY8Ypvhdelk3NP6YajvSK60FBn1jY.js?scope=footer&delta=1&language=en&theme=miz_missouri_edu_subtheme&include=eJx1jEEOwjAMBD-UNk-ynNikKXFcxS6ifT09cAAkpNVqZg-LRK7Yj4hvmG9Du4eE-Q6uV7b4wbBayDo4ZpVNO3e3WeoJUs10HxWYdrA9-cLC0yRK2EJRLY3BscRy1a_PuOLze5Tw9zQujMQjKEtigobn0RQp1u48jLNX7ZMm4_Hg8QL5U1dk | 5 KB | — | ✓ | 1st |
| https://snap.licdn.com/li.lms-analytics/insight.min.js | 19 KB | — | ✓ | 3rd |
| https://missouri.edu/sites/default/files/js/js_VBjOLSWhC8LQfHYLwsJASAw0EgreKOvnZ6F4kZMVkpg.js?scope=footer&delta=5&language=en&theme=miz_missouri_edu_subtheme&include=eJx1jEEOwjAMBD-UNk-ynNikKXFcxS6ifT09cAAkpNVqZg-LRK7Yj4hvmG9Du4eE-Q6uV7b4wbBayDo4ZpVNO3e3WeoJUs10HxWYdrA9-cLC0yRK2EJRLY3BscRy1a_PuOLze5Tw9zQujMQjKEtigobn0RQp1u48jLNX7ZMm4_Hg8QL5U1dk | 10 KB | — | ✓ | 1st |
| https://static.addtoany.com/menu/page.js | 2 KB | — | ✓ | 3rd |
| https://missouri.edu/sites/default/files/js/js_bsqrMTIj6Ie_9J46qUNYCRWV3HfMPTljTdTHSeY4eOA.js?scope=header&delta=0&language=en&theme=miz_missouri_edu_subtheme&include=eJx1jEEOwjAMBD-UNk-ynNikKXFcxS6ifT09cAAkpNVqZg-LRK7Yj4hvmG9Du4eE-Q6uV7b4wbBayDo4ZpVNO3e3WeoJUs10HxWYdrA9-cLC0yRK2EJRLY3BscRy1a_PuOLze5Tw9zQujMQjKEtigobn0RQp1u48jLNX7ZMm4_Hg8QL5U1dk | 0 KB | — | ✓ | 1st |
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
CPage Weight InventoryAction68 resources · 7.4 MB · 284 KB savings availableREVIEW
~284.0 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 68 resources | 7.4 MiB | ||||||
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
No green hosting detected
A+Third-Party Impact10% third-party, 0 ms blockingPASS
A+Text CompressionAll text resources are compressedPASS
A+Font Loading3 fonts (597 KB)PASS
Web fonts
3
597 KB total
Render-blocking
0
of 3
Dominant font-display
swap
Most common across fonts
Font loading timeline
- Convert to woff2 for ~30% smaller file size
- 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 ~414 KB and ~828 ms
A+Resource CachingAll resources properly cachedPASS
A+Critical Rendering PathNo render-blocking resourcesPASS
A+Resource HintsNo optimization neededPASS
A+HTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400, public
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
| public | — | Any cache may store this response |
Network Waterfall68 requests over 2122msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
Unattributable Unattributable | Other | 162ms | 0 KB | — | €2/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 85ms | 176 KB | 41% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 78ms | 132 KB | 47% | €1/mo | Optional |
Google Tag Manager www.googletagmanager.com | Tag Manager | 78ms | 157 KB | 42% | €1/mo | Optional |
Microsoft Clarity scripts.clarity.ms | Session Replay | 62ms | 25 KB | — | €1/mo | Optional |
68% 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