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.
3.39 s
Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.
10.37 s
Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.
1.43 s
Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.
3.368
Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.
12.92 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.
19.25 s
Page Load Progression
FPage Weight BudgetAction5.2 MB transferred, 91 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
DThird-Party ImpactAction100% third-party, 0 ms blockingFIX
FJS Execution CostAction4845ms total JS executionFIX
Main Thread Breakdown
| Script | Total | Scripting | Parse/Compile | Party |
|---|---|---|---|---|
| https://www.montana.edu/ | 1115ms | 78ms | 14ms | 3rd |
| Unattributable | 717ms | 13ms | 0ms | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WKPFHC | 436ms | 352ms | 74ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1Y3QZL2950&cx=c>m=4e64k1 | 414ms | 347ms | 62ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-666770703&cx=c>m=4e64k1 | 356ms | 295ms | 57ms | 3rd |
| https://scripts.clarity.ms/0.8.59/clarity.js | 321ms | 284ms | 11ms | 3rd |
| https://www.montana.edu/_resources/msu/2/scripts/slick-init.js?d=20210727 | 301ms | 229ms | 2ms | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-16514626677&cx=c>m=4e64k1 | 288ms | 230ms | 55ms | 3rd |
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 263ms | 133ms | 129ms | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-4471790-1 | 217ms | 161ms | 45ms | 3rd |
Showing top 10 of 13 scripts
FJS BundlesAction19 scripts, 559 KB unusedFIX
Downloaded but never executed on this page.
| Script | Size | Unused | Minified | Party |
|---|---|---|---|---|
| https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js | 362 KB | 242 KB (67%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtm.js?id=GTM-WKPFHC | 168 KB | 76 KB (45%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=UA-4471790-1 | 116 KB | 63 KB (54%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=G-1Y3QZL2950&cx=c>m=4e64k1 | 152 KB | 62 KB (41%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/destination?id=AW-16514626677&cx=c>m=4e64k1 | 143 KB | 62 KB (43%) | ✓ | 3rd |
| https://www.googletagmanager.com/gtag/js?id=AW-666770703&cx=c>m=4e64k1 | 144 KB | 54 KB (38%) | ✓ | 3rd |
| https://www.montana.edu/_resources/msu/2/scripts/slick-init.js?d=20210727 | 2 KB | — | ✓ | 3rd |
| https://www.montana.edu/_resources/msu/2/scripts/extra-slick.js?d=20210727 | 1 KB | — | ✓ | 3rd |
| https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js | 33 KB | — | ✓ | 3rd |
| https://www.google-analytics.com/analytics.js | 21 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
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 InventoryAction91 resources · 5.2 MB · 559 KB savings availableFIX
~559.4 KiB of savings available
| # | Resource | Type | Size | Cache | Unused | 3rd party | Issues |
|---|---|---|---|---|---|---|---|
| — | — | ||||||
| 91 resources | 5.2 MiB | ||||||
CImage OptimizationAction43 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
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 Loading2 fonts (113 KB)PASS
Web fonts
2
113 KB total
Render-blocking
0
of 2
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 HintsNo optimization neededPASS
A+Render-Blocking ResourcesNo render-blocking resources detectedPASS
A+Third-Party ResourcesNo third-party resources detectedPASS
AHTTP Cachingmax-age=86400 (1 day)PASS
max-age=86400
| Directive | Value | Meaning |
|---|---|---|
| max-age | 86400 | Cache for 1 day |
Network Waterfall91 requests over 20311msINFO
Third-Party Script CostPer-script blocking time, transfer cost, and cache headersINFO
| Script | Category | Execution | Transfer | Unused | Monthly Cost | Verdict |
|---|---|---|---|---|---|---|
www.montana.edu www.montana.edu | Other | 1115ms | 14 KB | — | $19/mo | Costly |
Unattributable Unattributable | Other | 717ms | 0 KB | — | $12/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 436ms | 168 KB | 45% | $8/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 414ms | 152 KB | 41% | $7/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 356ms | 144 KB | 38% | $6/mo | Costly |
Microsoft Clarity scripts.clarity.ms | Session Replay | 321ms | 26 KB | — | $6/mo | Costly |
www.montana.edu www.montana.edu | Other | 301ms | 2 KB | — | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 288ms | 143 KB | 43% | $5/mo | Costly |
www.gstatic.com www.gstatic.com | Other | 263ms | 362 KB | 67% | $5/mo | Costly |
Google Tag Manager www.googletagmanager.com | Tag Manager | 217ms | 116 KB | 54% | $4/mo | Costly |
ajax.googleapis.com ajax.googleapis.com | Other | 185ms | 33 KB | — | $3/mo | Optional |
Google Analytics www.google-analytics.com | Analytics | 138ms | 21 KB | — | $2/mo | Optional |
www.montana.edu www.montana.edu | Other | 92ms | 24 KB | — | $2/mo | Optional |
These scripts may cost more than they're worth
- www.montana.edu adds 1115ms and costs ~$19/month
- Unattributable adds 717ms and costs ~$12/month
- Google Tag Manager adds 436ms and costs ~$8/month
- Google Tag Manager adds 414ms and costs ~$7/month
- Google Tag Manager adds 356ms and costs ~$6/month
- Microsoft Clarity adds 321ms and costs ~$6/month
- www.montana.edu adds 301ms and costs ~$5/month
- Google Tag Manager adds 288ms and costs ~$5/month
- www.gstatic.com adds 263ms and costs ~$5/month
- Google Tag Manager adds 217ms and costs ~$4/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.montana.edu takes 1115ms 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 717ms 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 436ms 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 414ms 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 356ms 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
Microsoft Clarity takes 321ms 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.montana.edu takes 301ms 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 288ms 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.gstatic.com takes 263ms 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
67% of www.gstatic.com'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 217ms 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
54% 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