Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

100

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

2.60 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

5.29 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

449 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.086

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.71 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.

6.02 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 s

Checks

9 PASS 4 REVIEW 2 FIX

Third-Party Impact

Action

100% third-party, 0 ms blocking

FIX

100% third-party, 0 ms blocking

Third-party code accounts for 100% of page weight (666.0 KiB of 666.1 KiB)

Third-party blocking time is low (0 ms)

100%

First-party Third-party

HTTP Caching

Action

No cache headers

FIX

No cache headers

No Cache-Control header found

Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

Image Optimization

21 images, 0 KB saveable

REVIEW

21 images, 0 KB saveable

All images are well-optimized

21 images 194 KB

0 oversized -0 KB

15 legacy format

0 missing dimensions CLS risk

JS Execution Cost

Action

1931ms total JS execution

REVIEW

1931ms total JS execution

https://www.mtu.edu/: 571ms CPU time

https://gtm-tagging-1.mtu.edu/gtag/js?id=G-4700E3S...: 543ms CPU time

https://gtm-tagging-1.mtu.edu/gtm.js?id=GTM-K6W7S4...: 320ms CPU time

Unattributable: 316ms CPU time

https://www.mtu.edu/mtu_resources/assets/js/app.js: 181ms CPU time

Third-party scripts: 1931ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 23% Style & Layout 20% Script Parsing & Compilation 6% Rendering 3%

Script	Total	Scripting	Parse/Compile	Party
https://www.mtu.edu/	571ms	14ms	2ms	3rd
https://gtm-tagging-1.mtu.edu/gtag/js?id=G-4700E3SK7B&cx=c&gtm=4e64k0h1&sign=93faa44af3c3d2dc174b8092f0bcbb7eb7861c10c3a8fb95a7cec53c7467c22e_20260422	543ms	461ms	42ms	3rd
https://gtm-tagging-1.mtu.edu/gtm.js?id=GTM-K6W7S4L9	320ms	265ms	46ms	3rd
Unattributable	316ms	14ms	0ms	3rd
https://www.mtu.edu/mtu_resources/assets/js/app.js	181ms	108ms	12ms	3rd

JS Bundles

10 scripts, 82 KB unused

REVIEW

10 scripts, 82 KB unused

https://gtm-tagging-1.mtu.edu/gtm.js?id=GTM-K6W7S4...: 59 KB unused (35%)

Consider code splitting or tree shaking to reduce unused code.

https://www.mtu.edu/mtu_resources/assets/js/app.js: 23 KB unused (62%)

Consider code splitting or tree shaking to reduce unused code.

https://www.mtu.edu/mtu_resources/assets/js/app.js: unminified — 15 KB could be saved

Total unused JavaScript: 82 KB

82 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://gtm-tagging-1.mtu.edu/gtm.js?id=GTM-K6W7S4L9	169 KB	59 KB (35%)	✓	3rd
https://www.mtu.edu/mtu_resources/assets/js/app.js	37 KB	23 KB (62%)	✗	3rd
https://www.mtu.edu/_assets/compiled/program-search/index.js	7 KB	—	✓	3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js	31 KB	—	✓	3rd
https://www.mtu.edu/mtu_resources/script/n/ieWarn.js	1 KB	—	✓	3rd
https://www.mtu.edu/_resources/js/ug-hidden-inline-rfi.js	4 KB	—	✓	3rd
https://cdn.jsdelivr.net/gh/fancyapps/fancybox@3.5.7/dist/jquery.fancybox.min.js	23 KB	—	✓	3rd
https://gtm-tagging-1.mtu.edu/gtag/js?id=G-4700E3SK7B&cx=c&gtm=4e64k0h1&sign=93faa44af3c3d2dc174b8092f0bcbb7eb7861c10c3a8fb95a7cec53c7467c22e_20260422	0 KB	—	✓	3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K6W7S4L9&gtg_health=1	0 KB	—	✓	3rd
https://go.mtu.edu/ping	0 KB	—	✓	3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

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.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Page Weight Budget

666 KB transferred, 50 requests

PASS

666 KB transferred, 50 requests

Page weighs 2.3 MB (666 KB transferred)

50 HTTP requests

Estimated 0.14 g CO2 per page load

666 KB transferred

50 requests

0.14 g CO2 per page load

JavaScript 272.2 KiB 41%

Images 194.2 KiB 29%

CSS 88.0 KiB 13%

Fonts 86.4 KiB 13%

HTML 24.0 KiB 4%

Other 1.1 KiB 0%

Other 124 B 0%

Other 0 B 0%

0 2.4 MB 4.9 MB

Under budget

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

A+

Font Loading

2 fonts (86 KB)

PASS

2 fonts (86 KB)

2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

86 KB total

Render-blocking

of 2

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

open-sans-italic-v44.woff2 woff2 swap

Size 44 KB

Load time 48 ms

Start 483 ms

Risk FOUT — text flashes from fallback to web font

open-sans-normal-v44.woff2 woff2 swap

Size 42 KB

Load time 28 ms

Start 617 ms

Risk FOUT — text flashes from fallback to web font

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 Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

1 hints, 0 missing preconnects

PASS

1 hints, 0 missing preconnects

Page uses 1 resource hint(s)

Current Resource Hints

preconnect

—

preload

dns-prefetch

—

prefetch

—

1 resource hints configured

Page Weight Inventory

50 resources · 666 KB · 82 KB savings available

PASS

50 resources · 666 KB · 82 KB savings available

Within 1MB page-weight target

Got: 666 KB

~82 KB of savings available

49 third-party resources (100% of weight)

50 resources · 666.1 KiB · 49 third-party Within 1MB page-weight target

JavaScript 41% · 272.2 KiB

Image 29% · 194.2 KiB

CSS 13% · 88.0 KiB

Font 13% · 86.4 KiB

Document 4% · 24.0 KiB

Other 0% · 1.2 KiB

~82.4 KiB of savings available

Remove unused JavaScript: 82.4 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

50 resources			666.1 KiB

A+

Render-Blocking Resources

No render-blocking resources detected

PASS

No render-blocking resources detected

No render-blocking resources detected in <head>

A+

Third-Party Resources

No third-party resources detected

PASS

No third-party resources detected

Network Waterfall

50 requests over 5314ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Third-Party Script Cost

Per-script blocking time, transfer cost, and cache headers

INFO

100% of JavaScript execution is third-party

First-party Third-party 1931ms · 228KB · $26/mo

Script	Category	Execution	Transfer	Unused	Monthly Cost	Verdict
www.mtu.edu www.mtu.edu	Other	571ms	22 KB	—	$8/mo	Costly
gtm-tagging-1.mtu.edu gtm-tagging-1.mtu.edu	Other	543ms	0 KB	—	$7/mo	Costly
gtm-tagging-1.mtu.edu gtm-tagging-1.mtu.edu	Other	320ms	169 KB	35%	$4/mo	Costly
Unattributable Unattributable	Other	316ms	0 KB	—	$4/mo	Costly
www.mtu.edu www.mtu.edu	Other	181ms	37 KB	62%	$2/mo	Optional

www.mtu.edu

Other

Costly

Execution 571ms

Transfer 22 KB

Monthly Cost $8/mo

gtm-tagging-1.mtu.edu

Other

Costly

Execution 543ms

Transfer 0 KB

Monthly Cost $7/mo

gtm-tagging-1.mtu.edu

Other

Costly

Execution 320ms

Transfer 169 KB

Unused 35%

Monthly Cost $4/mo

Unattributable

Other

Costly

Execution 316ms

Transfer 0 KB

Monthly Cost $4/mo

www.mtu.edu

Other

Optional

Execution 181ms

Transfer 37 KB

Unused 62%

Monthly Cost $2/mo

These scripts may cost more than they're worth

www.mtu.edu adds 571ms and costs ~$8/month
gtm-tagging-1.mtu.edu adds 543ms and costs ~$7/month
gtm-tagging-1.mtu.edu adds 320ms and costs ~$4/month
Unattributable adds 316ms and costs ~$4/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

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.mtu.edu takes 571ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

gtm-tagging-1.mtu.edu takes 543ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

gtm-tagging-1.mtu.edu takes 320ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 316ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

62% of www.mtu.edu's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.