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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
78
GRADE
C
FIX
2
REVIEW
5
PASS
8
INFO
2

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

Mobile Desktop
46
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
100
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.

4.92 s

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

65.68 s

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

285 ms

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

0.138

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

10.24 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.

71.17 s

Page Load Progression

866 ms
1.7 s
2.6 s
3.5 s
4.3 s
5.2 s
6.1 s
6.9 s
Checks
17
8 PASS 5 REVIEW 2 FIX
F
Page Weight Budget
Action
28.1 MB transferred, 119 requests
FIX
28.1 MB transferred, 119 requests
Critical::
Page weighs 29.4 MB (28.1 MB transferred)
Warning::
Images are 22.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 22.8 MB
Warning::
JavaScript is 575 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 575 KB
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::
119 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 5.9 g CO2 per page load
28.1 MB / 2.4 MB budget
28.1 MB transferred
119 requests
5.9 g CO2 per page load
Images 22.8 MiB 81%
Other 4.3 MiB 15%
JavaScript 574.8 KiB 2%
Fonts 216.9 KiB 1%
CSS 127.8 KiB 0%
HTML 21.1 KiB 0%
Other 15.4 KiB 0%
Other 9.2 KiB 0%
Other 555 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

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

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.

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
JS Execution Cost
Action
3374ms total JS execution
FIX
3374ms total JS execution
Warning::
Unattributable: 1468ms CPU time
Warning::
https://illinois.edu/: 821ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-KTP...: 450ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5SX...: 212ms CPU time
Info::
https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js: 205ms CPU time
Warning::
Third-party scripts: 2414ms (72% of total)

Main Thread Breakdown

Other 46% Script Evaluation 22% Style & Layout 15% Rendering 7% Script Parsing & Compilation 6% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
Unattributable1468ms26ms0ms3rd
https://illinois.edu/821ms38ms8ms1st
https://www.googletagmanager.com/gtag/js?id=GT-KTPV7C3450ms349ms86ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5SX53NV7212ms171ms40ms3rd
https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js205ms36ms25ms3rd
https://illinois.edu/wp-content/themes/illinois/js/search.js80ms54ms25ms1st
https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js78ms10ms2ms3rd
https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.160ms48ms10ms1st
C
Image Optimization
Action
63 images, 0 KB saveable
REVIEW
63 images, 0 KB saveable
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://illinois.edu/wp-content/themes/illinois/as... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://media.news.illinois.edu/wp-content/uploads... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
63 images 22.8 MB
0 oversized -0 KB
62 legacy format
8 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

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

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

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

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

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

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

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 Bundles
Action
18 scripts, 258 KB unused
REVIEW
18 scripts, 258 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5SX...: 65 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=GT-KTP...: 65 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://illinois.edu/wp-content/themes/illinois/js...: 45 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.disability.illinois.edu/skipto.min.js: 36 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js: 24 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 258 KB
258 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-5SX53NV7125 KB65 KB (52%)✓3rd
https://www.googletagmanager.com/gtag/js?id=GT-KTPV7C3157 KB65 KB (41%)✓3rd
https://illinois.edu/wp-content/themes/illinois/js/search.js72 KB45 KB (63%)✓1st
https://cdn.disability.illinois.edu/skipto.min.js95 KB36 KB (38%)✓3rd
https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js55 KB24 KB (44%)✓3rd
https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.135 KB23 KB (67%)✓1st
https://illinois.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.16 KB—✓1st
https://illinois.edu/wp-content/themes/illinois/js/skiptoconf.js?ver=6.8.31 KB—✓1st
https://cdn.brand.illinois.edu/components/il-footer.mjs9 KB—✓3rd
https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js6 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

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
Page Weight Inventory
Action
119 resources · 28.1 MB · 258 KB savings available
REVIEW
119 resources · 28.1 MB · 258 KB savings available
Warning::
Page weight 27.1 MB over 1MB target
Got: 28.1 MB Expected: ≤ 1 MB
Info::
~258 KB of savings available
Info::
39 third-party resources (4% of weight)
Info::
31 resources over 200KB
119 resources · 28.1 MiB · 39 third-party 27.1 MiB over 1MB target
Image 81% · 22.9 MiB
Media 15% · 4.3 MiB
JavaScript 2% · 574.8 KiB
Font 1% · 216.9 KiB
CSS 0% · 132.1 KiB
Document 0% · 24.6 KiB
Other 0% · 1.9 KiB

~257.9 KiB of savings available

Remove unused JavaScript: 257.9 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache, private
REVIEW
no-cache, private
Info::
Cache-Control header is set
Got: no-cache, private
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

no-cache, private

DirectiveValueMeaning
no-cache—Cache but always revalidate first
private—Only browser cache, not CDN/proxy
A+
Third-Party Impact
4% third-party, 0 ms blocking
PASS
4% third-party, 0 ms blocking
Info::
Third-party code accounts for 4% of page weight (1.1 MiB of 28.1 MiB)
Info::
Third-party blocking time is low (0 ms)
96%
First-party Third-party
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
2 fonts (217 KB)
PASS
2 fonts (217 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

217 KB total

Render-blocking

0

of 2

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 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s FCP 4.9 s LCP 65.7 shttps://cdn.brand.illinois.edu/fonts/montserrat/montserrat-700.woff2montserrat-700.woff2 https://cdn.brand.illinois.edu/fonts/montserrat/montserrat-700.woff2 — 81.9 KiB — 64 ms — font-display: swaphttps://cdn.brand.illinois.edu/fonts/source-sans/source-sans-var.woff2source-sans-var.woff2 https://cdn.brand.illinois.edu/fonts/source-sans/source-sans-var.woff2 — 135.0 KiB — 54 ms — font-display: swap
montserrat-700.woff2 woff2 swap
Size 82 KB
Load time 64 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
source-sans-var.woff2 woff2 swap
Size 135 KB
Load time 54 ms
Start 1.4 s
Risk FOUT — text flashes from fallback to web font
  • 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 ~67 KB and ~134 ms

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
6 hints, 0 missing preconnects
PASS
6 hints, 0 missing preconnects
Info::
Page uses 6 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
6
prefetch
—

6 resource hints configured

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
Network Waterfall
119 requests over 6004ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s 58.0 s 60.0 s 62.0 s 64.0 s 66.0 s 68.0 s FCP 4.9 s LCP 65.7 shttps://illinois.edu// https://illinois.edu/ — 200 — 21.1 KiB — 495 ms — http/1.1https://illinois.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3/wp-includes/css/dist/block-library... https://illinois.edu/wp-includes/css/dist/block-library/style.min.css?ver=6.8.3 — 200 — 19.7 KiB — 133 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/style.css?ver=02.13.2026/wp-content/themes/illinois/style.c... https://illinois.edu/wp-content/themes/illinois/style.css?ver=02.13.2026 — 200 — 1.4 KiB — 137 ms — http/1.1https://cdn.brand.illinois.edu/illinois.css?ver=6.8.3cdn.brand.illinois.edu/illinois.css... https://cdn.brand.illinois.edu/illinois.css?ver=6.8.3 — 200 — 2.0 KiB — 114 ms — h2https://cdn.toolkit.illinois.edu/3.7.0/toolkit.csscdn.toolkit.illinois.edu/3.7.0/tool... https://cdn.toolkit.illinois.edu/3.7.0/toolkit.css — 200 — 65.6 KiB — 128 ms — h2https://cdn.brand.illinois.edu/components/il-footer.css?ver=6.8.3cdn.brand.illinois.edu/components/i... https://cdn.brand.illinois.edu/components/il-footer.css?ver=6.8.3 — 200 — 1.3 KiB — 115 ms — h2https://illinois.edu/wp-content/plugins/illinois-calendar//js/calendar.js?ver=6.8.3/wp-content/plugins/illinois-calend... https://illinois.edu/wp-content/plugins/illinois-calendar//js/calendar.js?ver=6.8.3 — 200 — 4.0 KiB — 262 ms — http/1.1https://illinois.edu/wp-content/plugins/illinois-calendar//js/slider.js?ver=6.8.3/wp-content/plugins/illinois-calend... https://illinois.edu/wp-content/plugins/illinois-calendar//js/slider.js?ver=6.8.3 — 200 — 2.2 KiB — 267 ms — http/1.1https://illinois.edu/wp-content/plugins/illinois-card-carousel//js/card-carousel.js?ver=6.8.3/wp-content/plugins/illinois-card-c... https://illinois.edu/wp-content/plugins/illinois-card-carousel//js/card-carousel.js?ver=6.8.3 — 200 — 1.8 KiB — 763 ms — http/1.1https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1/wp-includes/js/jquery/jquery.min.j... https://illinois.edu/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 — 200 — 35.1 KiB — 772 ms — http/1.1https://illinois.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1/wp-includes/js/jquery/jquery-migra... https://illinois.edu/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1 — 200 — 5.7 KiB — 788 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/js/skiptoconf.js?ver=6.8.3/wp-content/themes/illinois/js/skip... https://illinois.edu/wp-content/themes/illinois/js/skiptoconf.js?ver=6.8.3 — 200 — 813 B — 790 ms — http/1.1https://cdn.disability.illinois.edu/skipto.min.jscdn.disability.illinois.edu/skipto.... https://cdn.disability.illinois.edu/skipto.min.js — 200 — 95.3 KiB — 123 ms — http/1.1https://cdn.toolkit.illinois.edu/3.7.0/toolkit.jscdn.toolkit.illinois.edu/3.7.0/tool... https://cdn.toolkit.illinois.edu/3.7.0/toolkit.js — 200 — 55.1 KiB — 118 ms — h2https://cdn.brand.illinois.edu/components/il-footer.mjscdn.brand.illinois.edu/components/i... https://cdn.brand.illinois.edu/components/il-footer.mjs — 200 — 9.0 KiB — 113 ms — h2https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.jsonetrust.techservices.illinois.edu/... https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js — 200 — 5.7 KiB — 224 ms — h2https://illinois.edu/wp-content/uploads/2025/07/Journey-PNG-scaled-2-768x401.png/wp-content/uploads/2025/07/Journey... https://illinois.edu/wp-content/uploads/2025/07/Journey-PNG-scaled-2-768x401.png — 200 — 27.5 KiB — 1.0 s — http/1.1blob:https://illinois.edu/1292dadb-9405-428c-90d5-c042e31de188illinois.edu/1292dadb-9405-428c-90d... blob:https://illinois.edu/1292dadb-9405-428c-90d5-c042e31de188 — 200 — -1 B — 31 ms — blobhttps://cdn.brand.illinois.edu/illinois.csscdn.brand.illinois.edu/illinois.css https://cdn.brand.illinois.edu/illinois.css — 200 — 2.0 KiB — 23 ms — h2https://illinois.edu/wp-content/themes/illinois/css/typography.css/wp-content/themes/illinois/css/typ... https://illinois.edu/wp-content/themes/illinois/css/typography.css — 200 — 1.6 KiB — 230 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/wp-overrides.css/wp-content/themes/illinois/css/wp-... https://illinois.edu/wp-content/themes/illinois/css/wp-overrides.css — 200 — 1.6 KiB — 231 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/wigg.css/wp-content/themes/illinois/css/wig... https://illinois.edu/wp-content/themes/illinois/css/wigg.css — 200 — 1.1 KiB — 233 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/header.css/wp-content/themes/illinois/css/hea... https://illinois.edu/wp-content/themes/illinois/css/header.css — 200 — 3.7 KiB — 244 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/footer.css/wp-content/themes/illinois/css/foo... https://illinois.edu/wp-content/themes/illinois/css/footer.css — 200 — 1.9 KiB — 251 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/search.css/wp-content/themes/illinois/css/sea... https://illinois.edu/wp-content/themes/illinois/css/search.css — 200 — 3.7 KiB — 258 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/page.css/wp-content/themes/illinois/css/pag... https://illinois.edu/wp-content/themes/illinois/css/page.css — 200 — 990 B — 357 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/slider.css/wp-content/themes/illinois/css/sli... https://illinois.edu/wp-content/themes/illinois/css/slider.css — 200 — 2.0 KiB — 360 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/card-carousel.css/wp-content/themes/illinois/css/car... https://illinois.edu/wp-content/themes/illinois/css/card-carousel.css — 200 — 3.1 KiB — 358 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/calendar.css/wp-content/themes/illinois/css/cal... https://illinois.edu/wp-content/themes/illinois/css/calendar.css — 200 — 2.3 KiB — 378 ms — http/1.1https://illinois.edu/wp-content/themes/illinois/css/hero.css/wp-content/themes/illinois/css/her... https://illinois.edu/wp-content/themes/illinois/css/hero.css — 200 — 1.4 KiB — 376 ms — http/1.1
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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
72% of JavaScript execution is third-party
First-party Third-party 2414ms · 344KB · $42/mo
Unattributable
Other
Costly
Execution 1468ms
Transfer 0 KB
Monthly Cost $25/mo
Google Tag Manager
Tag Manager
Costly
Execution 450ms
Transfer 157 KB
Unused 41%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 212ms
Transfer 125 KB
Unused 52%
Monthly Cost $4/mo
cdn.toolkit.illinois.edu
Other
Costly
Execution 205ms
Transfer 55 KB
Unused 44%
Monthly Cost $4/mo
onetrust.techservices.illinois.edu
Other
Optional
Execution 78ms
Transfer 6 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 1468ms and costs ~$25/month
  • Google Tag Manager adds 450ms and costs ~$8/month
  • Google Tag Manager adds 212ms and costs ~$4/month
  • cdn.toolkit.illinois.edu adds 205ms and costs ~$4/month

72% 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

Unattributable takes 1468ms 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 450ms 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 212ms 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

52% of Google Tag Manager'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

cdn.toolkit.illinois.edu takes 205ms 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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