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https://northwestern.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
36
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
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.

5.47 s

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

12.54 s

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

891 ms

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

0.043

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

9.05 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.

14.37 s

Page Load Progression

781 ms
1.6 s
2.3 s
3.1 s
3.9 s
4.7 s
5.5 s
6.2 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
12.1 MB transferred, 105 requests
FIX
12.1 MB transferred, 105 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 225 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 225 KB
Warning::
105 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
105 requests
2.5 g CO2 per page load
Other 9.9 MiB 81%
Images 1.5 MiB 12%
JavaScript 452.6 KiB 4%
Fonts 225.2 KiB 2%
CSS 94.5 KiB 1%
Other 19.5 KiB 0%
HTML 12.1 KiB 0%
Other 5.5 KiB 0%
Other 861 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
F
JS Execution Cost
Action
7169ms total JS execution
FIX
7169ms total JS execution
Warning::
https://www.northwestern.edu/: 1996ms CPU time
Warning::
Unattributable: 1594ms CPU time
Warning::
https://common.northwestern.edu/v9/js/nu-custom.js: 986ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-JF7C...: 790ms CPU time
Warning::
https://common.northwestern.edu/dept/4.0/js/script...: 661ms CPU time
Warning::
Third-party scripts: 7169ms (100% of total)

Main Thread Breakdown

Other 39% Script Evaluation 26% Style & Layout 22% Rendering 7% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.northwestern.edu/1996ms84ms4ms3rd
Unattributable1594ms42ms0ms3rd
https://common.northwestern.edu/v9/js/nu-custom.js986ms324ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-JF7CBCTDRN790ms466ms108ms3rd
https://common.northwestern.edu/dept/4.0/js/scripts.js661ms97ms43ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7XLBH2NC54&cx=c&gtm=4e64h1443ms353ms86ms3rd
https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/banner.js206ms127ms5ms3rd
https://cdn-cookieyes.com/client_data/9c3338e8c0f82fb5466c9727/script.js185ms161ms8ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js135ms111ms16ms3rd
https://common.northwestern.edu/dept/4.0/js/custom.js?v=20260121123ms81ms4ms3rd

Showing top 10 of 11 scripts

D
Page Weight Inventory
Action
105 resources · 12.1 MB · 169 KB savings available
FIX
105 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::
104 third-party resources (100% of weight)
Info::
5 resources over 200KB
105 resources · 12.1 MiB · 104 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% · 225.2 KiB
CSS 1% · 94.5 KiB
Other 0% · 25.4 KiB
Document 0% · 12.6 KiB

~168.7 KiB of savings available

Remove unused JavaScript: 168.7 KiB
B
Image Optimization
54 images, 0 KB saveable
REVIEW
54 images, 0 KB saveable
Info::
All images are well-optimized
54 images 1.5 MB
0 oversized -0 KB
4 legacy format
0 missing dimensions CLS risk
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...: 42 KB unused (57%)
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 KB42 KB (57%)✓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
11 fonts (225 KB)
PASS
11 fonts (225 KB)
Info::
11 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

11

225 KB total

Render-blocking

0

of 11

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.5 s LCP 12.5 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 — 93 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 — 643 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 — 37.8 KiB — 848 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 — 15.1 KiB — 758 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 — 34.8 KiB — 835 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 — 735 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 — 628 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 — 37.8 KiB — 716 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 — 15.8 KiB — 624 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 — 8.1 KiB — 624 ms — font-display: swaphttps://common.northwestern.edu/dept/4.0/css/fonts/poppins/poppins-v21-latin-300.woff2poppins-v21-latin-300.w... https://common.northwestern.edu/dept/4.0/css/fonts/poppins/poppins-v21-latin-300.woff2 — 8.1 KiB — 105 ms — font-display: swap
font-woff;charset=utf-8... woff swap
Size 2 KB
Load time 93 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
noto-serif-v23-latin-70... woff2 swap
Size 15 KB
Load time 643 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-bold... woff2 swap
Size 38 KB
Load time 848 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-50... woff2 swap
Size 15 KB
Load time 758 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-bold... woff2 swap
Size 35 KB
Load time 835 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-regu... woff2 swap
Size 35 KB
Load time 735 ms
Start 2.8 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-70... woff2 swap
Size 16 KB
Load time 628 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
lineto-akkurat-pro-ital... woff2 swap
Size 38 KB
Load time 716 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
noto-serif-v23-latin-it... woff2 swap
Size 16 KB
Load time 624 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
poppins-v21-latin-500.w... woff2 swap
Size 8 KB
Load time 624 ms
Start 2.9 s
Risk FOUT — text flashes from fallback to web font
poppins-v21-latin-300.w... woff2 swap
Size 8 KB
Load time 105 ms
Start 3.7 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+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
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
105 requests over 3934ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 5.5 s LCP 12.5 shttps://northwestern.edu// https://northwestern.edu/ — 301 — 508 B — 763 ms — http/1.1https://www.northwestern.edu/www.northwestern.edu/ https://www.northwestern.edu/ — 200 — 12.1 KiB — 1.1 s — 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 — 33 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 — 41 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 — 776 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 — 603 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 — 599 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 — 112 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 — 930 ms — h2https://log.cookieyes.com/api/v1/loglog.cookieyes.com/api/v1/log https://log.cookieyes.com/api/v1/log — 200 — 260 B — 64 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 — 167 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 — 270 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 — 335 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 — 34 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 — 718 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 — 541 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 — 541 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 — 16 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 — 411 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 — 321 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 — 393 ms — http/1.1https://www.northwestern.edu/images/homepage/tiles/research-test-tube.webpwww.northwestern.edu/images/homepag... https://www.northwestern.edu/images/homepage/tiles/research-test-tube.webp — 200 — 28.8 KiB — 626 ms — http/1.1https://region1.analytics.google.com/g/collect?v=2&tid=G-JF7CBCTDRN&gtm=45je64h1v868799143za200zd868799143&_p=1776799393746&_gaz=1&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&_eu=AAAAAGA&are=1&cid=1317623571.1776799394&frm=0&pscdl=noapi&rcb=14&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266401~117512542&sid=1776799393&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=2142region1.analytics.google.com/g/coll... 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200 — 89.5 KiB — 214 ms — http/1.1https://www.northwestern.edu/images/homepage/explore/sailing_center_1x.webpwww.northwestern.edu/images/homepag... https://www.northwestern.edu/images/homepage/explore/sailing_center_1x.webp — 200 — 25.9 KiB — 120 ms — http/1.1https://www.northwestern.edu/images/homepage/explore/alumna_greta_lee_1x.webpwww.northwestern.edu/images/homepag... https://www.northwestern.edu/images/homepage/explore/alumna_greta_lee_1x.webp — 200 — 24.4 KiB — 114 ms — http/1.1https://www.northwestern.edu/images/homepage/explore/dance_marathon_1x.webpwww.northwestern.edu/images/homepag... https://www.northwestern.edu/images/homepage/explore/dance_marathon_1x.webp — 200 — 34.0 KiB — 117 ms — http/1.1https://dgwlxezajnh25.cloudfront.net/top-level-v9/homepage-tiles/athletics-field-hockey-win.mp4dgwlxezajnh25.cloudfront.net/top-le... https://dgwlxezajnh25.cloudfront.net/top-level-v9/homepage-tiles/athletics-field-hockey-win.mp4 — 206 — 323.7 KiB — 142 ms — 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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 7169ms · 526KB · $95/mo
www.northwestern.edu
Other
Costly
Execution 1996ms
Transfer 12 KB
Monthly Cost $26/mo
Unattributable
Other
Costly
Execution 1594ms
Transfer 0 KB
Monthly Cost $21/mo
common.northwestern.edu
Other
Costly
Execution 986ms
Transfer 4 KB
Monthly Cost $13/mo
Google Tag Manager
Tag Manager
Costly
Execution 790ms
Transfer 152 KB
Unused 40%
Monthly Cost $10/mo
common.northwestern.edu
Other
Costly
Execution 661ms
Transfer 74 KB
Unused 57%
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 443ms
Transfer 153 KB
Unused 43%
Monthly Cost $6/mo
cdn-cookieyes.com
Other
Costly
Execution 206ms
Transfer 8 KB
Monthly Cost $3/mo
cdn-cookieyes.com
Other
Optional
Execution 185ms
Transfer 12 KB
Monthly Cost $2/mo
ajax.googleapis.com
Other
Optional
Execution 135ms
Transfer 30 KB
Monthly Cost $2/mo
common.northwestern.edu
Other
Optional
Execution 123ms
Transfer 5 KB
Monthly Cost $2/mo
common.northwestern.edu
Other
Optional
Execution 50ms
Transfer 75 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.northwestern.edu adds 1996ms and costs ~$26/month
  • Unattributable adds 1594ms and costs ~$21/month
  • common.northwestern.edu adds 986ms and costs ~$13/month
  • Google Tag Manager adds 790ms and costs ~$10/month
  • common.northwestern.edu adds 661ms and costs ~$9/month
  • Google Tag Manager adds 443ms and costs ~$6/month
  • cdn-cookieyes.com adds 206ms and costs ~$3/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 1996ms 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 1594ms 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

common.northwestern.edu takes 986ms 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

Google Tag Manager takes 790ms 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

common.northwestern.edu takes 661ms 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

57% 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

Google Tag Manager takes 443ms 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

cdn-cookieyes.com takes 206ms 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

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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