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https://northwestern.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
70
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

1.67 s

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

3.12 s

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

30 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.

2.93 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.

3.25 s

Page Load Progression

657 ms
1.3 s
2.0 s
2.6 s
3.3 s
3.9 s
4.6 s
5.3 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
12.1 MB transferred, 108 requests
FIX
12.1 MB transferred, 108 requests
Critical::
Page weighs 13.5 MB (12.1 MB transferred)
Warning::
Images are 1.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.5 MB
Info::
Fonts are 217 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 217 KB
Warning::
108 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 2.5 g CO2 per page load
12.1 MB / 2.4 MB budget
12.1 MB transferred
108 requests
2.5 g CO2 per page load
Other 9.9 MiB 81%
Images 1.5 MiB 12%
JavaScript 452.6 KiB 4%
Fonts 217.1 KiB 2%
CSS 94.5 KiB 1%
Other 19.5 KiB 0%
HTML 12.1 KiB 0%
Other 5.5 KiB 0%
Other 879 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (12.1 MiB of 12.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
108 resources · 12.1 MB · 169 KB savings available
FIX
108 resources · 12.1 MB · 169 KB savings available
Warning::
Page weight 11.1 MB over 1MB target
Got: 12.1 MB Expected: ≤ 1 MB
Info::
~169 KB of savings available
Warning::
107 third-party resources (100% of weight)
Info::
4 resources over 200KB
108 resources · 12.1 MiB · 107 third-party 11.1 MiB over 1MB target
Media 81% · 9.9 MiB
Image 12% · 1.5 MiB
JavaScript 4% · 452.6 KiB
Font 2% · 217.1 KiB
CSS 1% · 94.5 KiB
Other 0% · 25.4 KiB
Document 0% · 12.6 KiB

~169.2 KiB of savings available

Remove unused JavaScript: 169.2 KiB
B
Image Optimization
53 images, 0 KB saveable
REVIEW
53 images, 0 KB saveable
Warning::
https://common.northwestern.edu/v9/css/images/nort... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
53 images 1.5 MB
0 oversized -0 KB
4 legacy format
1 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1368ms total JS execution
REVIEW
1368ms total JS execution
Warning::
https://www.northwestern.edu/: 506ms CPU time
Warning::
Unattributable: 399ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-JF7C...: 165ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7XLB...: 108ms CPU time
Info::
https://common.northwestern.edu/dept/4.0/js/script...: 85ms CPU time
Warning::
Third-party scripts: 1368ms (100% of total)

Main Thread Breakdown

Other 36% Script Evaluation 26% Style & Layout 25% Rendering 5% Script Parsing & Compilation 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.northwestern.edu/506ms18ms1ms3rd
Unattributable399ms11ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JF7CBCTDRN165ms94ms19ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7XLBH2NC54&cx=c&gtm=4e64h1108ms86ms21ms3rd
https://common.northwestern.edu/dept/4.0/js/scripts.js85ms20ms11ms3rd
https://common.northwestern.edu/v9/js/nu-custom.js53ms36ms1ms3rd
https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/banner.js52ms33ms2ms3rd
C
JS Bundles
Action
10 scripts, 169 KB unused
REVIEW
10 scripts, 169 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7XLB...: 65 KB unused (43%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JF7C...: 61 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://common.northwestern.edu/dept/4.0/js/script...: 43 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 169 KB
169 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-7XLBH2NC54&cx=c&gtm=4e64h1153 KB65 KB (43%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-JF7CBCTDRN152 KB61 KB (40%)✓3rd
https://common.northwestern.edu/dept/4.0/js/scripts.js74 KB43 KB (58%)✓3rd
https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/script.js12 KB—✓3rd
https://common.gmc-cloud.net/mburger.js7 KB—✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js30 KB—✓3rd
https://common.northwestern.edu/dept/4.0/js/custom.js?v=202601215 KB—✓3rd
https://common.northwestern.edu/v9/js/nu-custom.js4 KB—✓3rd
https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/banner.js8 KB—✓3rd
https://common.gmc-cloud.net/mburger-component.js7 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

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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
10 fonts (217 KB)
PASS
10 fonts (217 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

217 KB total

Render-blocking

0

of 10

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.1 sdata:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA…font-woff;charset=utf-8... data:application/font-woff;charset=utf-8;base64, d09GRgABAAAAAAZgABAAAAAADAAAAAAAAAAAAAAAAAAAAAAAAA… — 1.6 KiB — 229 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-regular.woff2lineto-akkurat-pro-regu... https://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-regular.woff2 — 34.8 KiB — 435 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-700.woff2noto-serif-v23-latin-70... https://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-700.woff2 — 15.2 KiB — 423 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-bolditalic.woff2lineto-akkurat-pro-bold... https://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-bolditalic.woff2 — 38.0 KiB — 512 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-500.woff2noto-serif-v23-latin-50... https://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-500.woff2 — 15.3 KiB — 424 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-bold.woff2lineto-akkurat-pro-bold... https://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-bold.woff2 — 34.9 KiB — 511 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-700italic.woff2noto-serif-v23-latin-70... https://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-700italic.woff2 — 16.0 KiB — 403 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-italic.woff2lineto-akkurat-pro-ital... https://common.northwestern.edu/dept/4.0/css/fonts/akkurat/lineto-akkurat-pro-italic.woff2 — 37.7 KiB — 501 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-italic.woff2noto-serif-v23-latin-it... https://common.northwestern.edu/dept/4.0/css/fonts/noto-serif/noto-serif-v23-latin-italic.woff2 — 15.7 KiB — 501 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/poppins/poppins-v21-latin-500.woff2poppins-v21-latin-500.w... https://common.northwestern.edu/dept/4.0/css/fonts/poppins/poppins-v21-latin-500.woff2 — 8.0 KiB — 490 ms — font-display: swap
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 229 ms
Start 2.0 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
lineto-akkurat-pro-regu... woff2 swap
Size 35 KB
Load time 435 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-70... woff2 swap
Size 15 KB
Load time 423 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-bold... woff2 swap
Size 38 KB
Load time 512 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-50... woff2 swap
Size 15 KB
Load time 424 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-bold... woff2 swap
Size 35 KB
Load time 511 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-70... woff2 swap
Size 16 KB
Load time 403 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-ital... woff2 swap
Size 38 KB
Load time 501 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-it... woff2 swap
Size 16 KB
Load time 501 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
poppins-v21-latin-500.w... woff2 swap
Size 8 KB
Load time 490 ms
Start 2.1 s
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
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
A
HTTP Caching
max-age=300 (5 minutes)
PASS
max-age=300 (5 minutes)
Info::
Cache-Control header is set
Got: max-age=300
Info::
Effective TTL: 5 minutes (max-age=300)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=300

DirectiveValueMeaning
max-age300Cache for 5 minutes
Effective TTL: 300 seconds
Network Waterfall
108 requests over 2915ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.7 s LCP 3.1 shttps://northwestern.edu// https://northwestern.edu/ — 301 — 508 B — 482 ms — http/1.1https://www.northwestern.edu/www.northwestern.edu/ https://www.northwestern.edu/ — 200 — 12.1 KiB — 520 ms — http/1.1https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/script.jscdn-cookieyes.com/client_data/9c333... https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/script.js — 200 — 11.8 KiB — 32 ms — h2https://www.googletagmanager.com/gtag/js?id=G-JF7CBCTDRNwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-JF7CBCTDRN — 200 — 152.5 KiB — 40 ms — h2https://common.northwestern.edu/dept/4.0/css/styles.csscommon.northwestern.edu/dept/4.0/cs... https://common.northwestern.edu/dept/4.0/css/styles.css — 200 — 75.4 KiB — 791 ms — http/1.1https://common.northwestern.edu/v9/css/nu.csscommon.northwestern.edu/v9/css/nu.c... https://common.northwestern.edu/v9/css/nu.css — 200 — 17.5 KiB — 617 ms — http/1.1https://common.northwestern.edu/v9/css/images/northwestern.svgcommon.northwestern.edu/v9/css/imag... https://common.northwestern.edu/v9/css/images/northwestern.svg — 200 — 2.0 KiB — 614 ms — http/1.1https://www.northwestern.edu/images/news/2026/hdr670.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2026/hdr670.webp — 200 — 20.7 KiB — 115 ms — http/1.1https://common.gmc-cloud.net/mburger.jscommon.gmc-cloud.net/mburger.js https://common.gmc-cloud.net/mburger.js — 200 — 6.5 KiB — 774 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 66 ms — h3https://www.northwestern.edu/images/news/2026/sq-acc550.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2026/sq-acc550.webp — 200 — 28.8 KiB — 164 ms — http/1.1https://www.northwestern.edu/images/news/2026/gilman550.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2026/gilman550.webp — 200 — 10.1 KiB — 267 ms — http/1.1https://www.northwestern.edu/images/news/2026/superagers550.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2026/superagers550.webp — 200 — 11.8 KiB — 305 ms — http/1.1https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js — 200 — 30.4 KiB — 155 ms — h2https://common.northwestern.edu/dept/4.0/js/scripts.jscommon.northwestern.edu/dept/4.0/js... https://common.northwestern.edu/dept/4.0/js/scripts.js — 200 — 74.2 KiB — 728 ms — http/1.1https://common.northwestern.edu/dept/4.0/js/custom.js?v=20260121common.northwestern.edu/dept/4.0/js... https://common.northwestern.edu/dept/4.0/js/custom.js?v=20260121 — 200 — 4.9 KiB — 552 ms — http/1.1https://common.northwestern.edu/v9/js/nu-custom.jscommon.northwestern.edu/v9/js/nu-cu... https://common.northwestern.edu/v9/js/nu-custom.js — 200 — 4.3 KiB — 552 ms — http/1.1https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/banner.jscdn-cookieyes.com/client_data/9c333... https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/banner.js — 200 — 7.8 KiB — 17 ms — h2https://www.northwestern.edu/images/news/2026/cba550.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2026/cba550.webp — 200 — 35.2 KiB — 359 ms — http/1.1https://www.northwestern.edu/images/news/2026/apprentice550.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2026/apprentice550.webp — 200 — 11.0 KiB — 252 ms — http/1.1https://www.northwestern.edu/images/news/2025/search550.webpwww.northwestern.edu/images/news/20... https://www.northwestern.edu/images/news/2025/search550.webp — 200 — 26.8 KiB — 270 ms — http/1.1https://region1.analytics.google.com/g/collect?v=2&tid=G-JF7CBCTDRN&gtm=45je64h1v868799143za200zd868799143&_p=1776799416419&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=688041781.1776799417&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~118128922~118167060~118463262&sid=1776799416&sct=1&seg=0&dl=https%3A%2F%2Fwww.northwestern.edu%2F&dt=Northwestern%20University&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1216region1.analytics.google.com/g/coll... https://region1.analytics.google.com/g/collect?v=2&tid=G-JF7CBCTDRN&gtm=45je64h1v868799143za200zd868799143&_p=1776799416419&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=688041781.1776799417&frm=0&pscdl=noapi&rcb=15&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~118128922~118167060~118463262&sid=1776799416&sct=1&seg=0&dl=https%3A%2F%2Fwww.northwestern.edu%2F&dt=Northwestern%20University&en=page_view&_fv=1&_nsi=1&_ss=1&_ee=1&tfd=1216 — 204 — 553 B — 64 ms — h2https://www.googletagmanager.com/gtag/js?id=G-7XLBH2NC54&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-7XLBH2NC54&cx=c&gtm=4e64h1 — 200 — 152.8 KiB — 29 ms — h2https://www.northwestern.edu/images/homepage/tiles/research-test-tube.webpwww.northwestern.edu/images/homepag... 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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 1368ms · 404KB · $18/mo
www.northwestern.edu
Other
Costly
Execution 506ms
Transfer 12 KB
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 399ms
Transfer 0 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Optional
Execution 165ms
Transfer 152 KB
Unused 40%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 108ms
Transfer 153 KB
Unused 43%
Monthly Cost $1/mo
common.northwestern.edu
Other
Optional
Execution 85ms
Transfer 74 KB
Unused 58%
Monthly Cost $1/mo
common.northwestern.edu
Other
Optional
Execution 53ms
Transfer 4 KB
Monthly Cost $1/mo
cdn-cookieyes.com
Other
Optional
Execution 52ms
Transfer 8 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.northwestern.edu adds 506ms and costs ~$7/month
  • Unattributable adds 399ms and costs ~$5/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.northwestern.edu takes 506ms 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 399ms 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

58% of common.northwestern.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.

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