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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
19
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.
96
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.

2.09 s

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

16.31 s

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

1.47 s

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

0.669

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

6.02 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.

18.82 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
17
8 PASS 2 REVIEW 5 FIX
D
Page Weight Budget
Action
2.5 MB transferred, 74 requests
FIX
2.5 MB transferred, 74 requests
Warning::
Page weighs 7.9 MB (2.5 MB transferred)
Warning::
JavaScript is 687 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 687 KB
Info::
CSS is 403 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 403 KB
Info::
74 HTTP requests
Info::
Estimated 0.53 g CO2 per page load
2.5 MB / 2.4 MB budget
2.5 MB transferred
74 requests
0.53 g CO2 per page load
Other 983.3 KiB 38%
JavaScript 686.9 KiB 26%
CSS 403.2 KiB 16%
Images 384.6 KiB 15%
Fonts 68.8 KiB 3%
HTML 38.1 KiB 1%
Other 30.5 KiB 1%
Other 966 B 0%
Other 594 B 0%
Other 555 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (2.5 MiB of 2.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4925ms total JS execution
FIX
4925ms total JS execution
Warning::
https://www.uic.edu/: 2023ms CPU time
Warning::
https://www.uic.edu/js/app.6ba5d18c.js: 1246ms CPU time
Warning::
Unattributable: 525ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T6L...: 522ms CPU time
Info::
https://www.uic.edu/js/vendors~app.bff880a0.js: 193ms CPU time
Warning::
Third-party scripts: 4925ms (100% of total)

Main Thread Breakdown

Other 36% Script Evaluation 31% Style & Layout 11% Script Parsing & Compilation 9% Parse HTML & CSS 6% Rendering 5%
ScriptTotalScriptingParse/CompileParty
https://www.uic.edu/2023ms12ms3ms3rd
https://www.uic.edu/js/app.6ba5d18c.js1246ms929ms14ms3rd
Unattributable525ms9ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T6LXVFW522ms349ms169ms3rd
https://www.uic.edu/js/vendors~app.bff880a0.js193ms31ms33ms3rd
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&l=dataLayer&cx=c182ms107ms71ms3rd
https://www.google-analytics.com/analytics.js130ms63ms65ms3rd
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&cx=c&_slc=1104ms34ms69ms3rd
D
Page Weight Inventory
Action
74 resources · 2.5 MB · 285 KB savings available
FIX
74 resources · 2.5 MB · 285 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~285 KB of savings available
Warning::
73 third-party resources (100% of weight)
Info::
4 resources over 200KB
74 resources · 2.5 MiB · 73 third-party 1.5 MiB over 1MB target
Other 38% · 985.4 KiB
JavaScript 26% · 686.9 KiB
Image 16% · 415.0 KiB
CSS 16% · 403.2 KiB
Font 3% · 68.8 KiB
Document 1% · 38.3 KiB

~284.8 KiB of savings available

Remove unused JavaScript: 284.8 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
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.

C
JS Bundles
Action
15 scripts, 285 KB unused
REVIEW
15 scripts, 285 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T2YV...: 116 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T2YV...: 65 KB unused (37%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-T6L...: 65 KB unused (51%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uic.edu/js/vendors~app.bff880a0.js: 39 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 285 KB
285 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&cx=c&_slc=1179 KB116 KB (65%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&l=dataLayer&cx=c177 KB65 KB (37%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T6LXVFW128 KB65 KB (51%)✓3rd
https://www.uic.edu/js/vendors~app.bff880a0.js87 KB39 KB (45%)✓3rd
https://www.uic.edu/sri-fallback.js1 KB—✓3rd
https://www.uic.edu/js/skipto.min.js12 KB—✓3rd
https://cdn.mouseflow.com/projects/4f7b7910-6e13-4b4e-b9ff-cf52335fbf91.js0 KB—✓3rd
https://player.vimeo.com/api/player-2.18.0.js7 KB—✓3rd
https://www.uic.edu/js/app.6ba5d18c.js31 KB—✓3rd
https://uic-emergency-alert-banner.azurewebsites.net/api/UICEmergencyAlertUI?code=0fasjkGLOoMn422JuxiUMgQu-2TG5atiS_l6FD2jZipzAzFus8U1kg==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

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
Image Optimization
5 images, 0 KB saveable
PASS
5 images, 0 KB saveable
Warning::
data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAA... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
5 images 385 KB
0 oversized -0 KB
0 legacy format
2 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

A+
Font Loading
3 fonts (69 KB)
PASS
3 fonts (69 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

69 KB total

Render-blocking

0

of 3

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 FCP 2.1 s LCP 16.3 sdata:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFv4ABMAAAAA3AgAAFuKAAMAgwAAAAAAAAAAAA…font-woff2;charset=utf-... data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFv4ABMAAAAA3AgAAFuKAAMAgwAAAAAAAAAAAA… — 23.0 KiB — 7 ms — font-display: swapdata:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFtgABMAAAAA3WAAAFrzAAMAgwAAAAAAAAAAAA…font-woff2;charset=utf-... data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFtgABMAAAAA3WAAAFrzAAMAgwAAAAAAAAAAAA… — 22.8 KiB — 6 ms — font-display: swapdata:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFv8ABMAAAAA3BgAAFuOAAMAgwAAAAAAAAAAAA…font-woff2;charset=utf-... data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFv8ABMAAAAA3BgAAFuOAAMAgwAAAAAAAAAAAA… — 23.0 KiB — 149 ms — font-display: swap
font-woff2;charset=utf-... woff2 swap
Size 23 KB
Load time 7 ms
Start 586 ms
Risk FOUT — text flashes from fallback to web font
font-woff2;charset=utf-... woff2 swap
Size 23 KB
Load time 6 ms
Start 589 ms
Risk FOUT — text flashes from fallback to web font
font-woff2;charset=utf-... woff2 swap
Size 23 KB
Load time 149 ms
Start 1.9 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
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
2
preload
3
dns-prefetch
—
prefetch
—

5 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
74 requests over 5257ms
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 FCP 2.1 s LCP 16.3 shttps://uic.edu// https://uic.edu/ — 301 — 153 B — 118 ms — h2https://www.uic.edu/www.uic.edu/ https://www.uic.edu/ — 200 — 38.1 KiB — 104 ms — h2https://cdn.mouseflow.com/projects/4f7b7910-6e13-4b4e-b9ff-cf52335fbf91.jscdn.mouseflow.com/projects/4f7b7910... https://cdn.mouseflow.com/projects/4f7b7910-6e13-4b4e-b9ff-cf52335fbf91.js — -1 — 0 B — 73 ms — https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&cx=c&_slc=1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&cx=c&_slc=1 — 200 — 178.7 KiB — 88 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 23 ms — h2https://www.uic.edu/css/app.cea8f156.csswww.uic.edu/css/app.cea8f156.css https://www.uic.edu/css/app.cea8f156.css — 200 — 403.2 KiB — 209 ms — h2https://www.uic.edu/js/app.6ba5d18c.jswww.uic.edu/js/app.6ba5d18c.js https://www.uic.edu/js/app.6ba5d18c.js — 200 — 31.4 KiB — 59 ms — h2https://www.uic.edu/js/vendors~app.bff880a0.jswww.uic.edu/js/vendors~app.bff880a0... https://www.uic.edu/js/vendors~app.bff880a0.js — 200 — 86.6 KiB — 115 ms — h2https://www.uic.edu/js/skipto.min.jswww.uic.edu/js/skipto.min.js https://www.uic.edu/js/skipto.min.js — 200 — 11.7 KiB — 49 ms — h2https://www.uic.edu/sri-fallback.jswww.uic.edu/sri-fallback.js https://www.uic.edu/sri-fallback.js — 200 — 740 B — 136 ms — h2https://player.vimeo.com/api/player-2.18.0.jsplayer.vimeo.com/api/player-2.18.0.... https://player.vimeo.com/api/player-2.18.0.js — 200 — 7.3 KiB — 33 ms — http/1.1data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAABGdBTUEAALGPC/xhBQAAAAlwSFlzA…data:image/png;base64,iVBORw0KGgoAA... data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAABGdBTUEAALGPC/xhBQAAAAlwSFlzA… — 200 — 0 B — 0 ms — datahttps://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&l=dataLayer&cx=cwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&l=dataLayer&cx=c — 200 — 176.7 KiB — 85 ms — h2https://uic-emergency-alert-banner.azurewebsites.net/api/UICEmergencyAlertUI?code=0fasjkGLOoMn422JuxiUMgQu-2TG5atiS_l6FD2jZipzAzFus8U1kg==uic-emergency-alert-banner.azureweb... https://uic-emergency-alert-banner.azurewebsites.net/api/UICEmergencyAlertUI?code=0fasjkGLOoMn422JuxiUMgQu-2TG5atiS_l6FD2jZipzAzFus8U1kg== — 200 — 394 B — 289 ms — http/1.1https://www.googletagmanager.com/gtm.js?id=GTM-T6LXVFWwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-T6LXVFW — 200 — 127.8 KiB — 85 ms — h2https://www.uic.edu/manifest.jsonwww.uic.edu/manifest.json https://www.uic.edu/manifest.json — 200 — 966 B — 182 ms — http/1.1https://cms.uic.edu/wp-content/uploads/2024/08/Aspire_UIC-Web-Homepage-Hero_AltText.webpcms.uic.edu/wp-content/uploads/2024... https://cms.uic.edu/wp-content/uploads/2024/08/Aspire_UIC-Web-Homepage-Hero_AltText.webp — 200 — 37.5 KiB — 186 ms — http/1.1data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7data:image/gif;base64,R0lGODlhAQABA... data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7 — 200 — 0 B — 0 ms — datahttps://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.jsonetrust.techservices.illinois.edu/... https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js — 200 — 5.8 KiB — 232 ms — h2https://siteimproveanalytics.com/js/siteanalyze_2950.jssiteimproveanalytics.com/js/siteana... https://siteimproveanalytics.com/js/siteanalyze_2950.js — 200 — 786 B — 23 ms — h3https://cms.uic.edu/wp-json/menuscms.uic.edu/wp-json/menus https://cms.uic.edu/wp-json/menus — 200 — 0 B — 240 ms — http/1.1https://cms.uic.edu/wp-json/acf_optionscms.uic.edu/wp-json/acf_options https://cms.uic.edu/wp-json/acf_options — 200 — 0 B — 257 ms — http/1.1https://cms.uic.edu/wp-json/posts?type=landing_page&filter[posts_per_page]=-1cms.uic.edu/wp-json/posts?type=land... https://cms.uic.edu/wp-json/posts?type=landing_page&filter[posts_per_page]=-1 — 200 — 0 B — 318 ms — http/1.1https://cms.uic.edu/wp-json/academic-dates/upcomingcms.uic.edu/wp-json/academic-dates/... https://cms.uic.edu/wp-json/academic-dates/upcoming — 200 — 0 B — 323 ms — http/1.1https://cms.uic.edu/wp-json/posts?type=page&filter[posts_per_page]=-1cms.uic.edu/wp-json/posts?type=page... https://cms.uic.edu/wp-json/posts?type=page&filter[posts_per_page]=-1 — 200 — 0 B — 232 ms — http/1.1https://cms.uic.edu/wp-json/posts?type=reminder&filter[posts_per_page]=-1cms.uic.edu/wp-json/posts?type=remi... https://cms.uic.edu/wp-json/posts?type=reminder&filter[posts_per_page]=-1 — 200 — 0 B — 244 ms — http/1.1data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFv4ABMAAAAA3AgAAFuKAAMAgwAAAAAAAAAAAA…data:application/font-woff2;charset... data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFv4ABMAAAAA3AgAAFuKAAMAgwAAAAAAAAAAAA… — 200 — 23.0 KiB — 7 ms — datadata:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFtgABMAAAAA3WAAAFrzAAMAgwAAAAAAAAAAAA…data:application/font-woff2;charset... data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFtgABMAAAAA3WAAAFrzAAMAgwAAAAAAAAAAAA… — 200 — 22.8 KiB — 6 ms — datahttps://cdn.mouseflow.com/projects/4f7b7910-6e13-4b4e-b9ff-cf52335fbf91.jscdn.mouseflow.com/projects/4f7b7910... https://cdn.mouseflow.com/projects/4f7b7910-6e13-4b4e-b9ff-cf52335fbf91.js — -1 — 0 B — 46 ms — https://analytics.google.com/g/collect?v=2&tid=G-T2YV1VZP5R&gtm=45je64h1v9117632985za200zd9117632985&_p=1776805228035&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&ecid=302659558&_eu=AEAEAGA&ae=a&are=1&cid=577749652.1776805228&frm=0&pscdl=noapi&rcb=9&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=0~115616985~115938466~115938468~117266401~117384406~118463261&sid=1776805228&sct=1&seg=0&dl=https%3A%2F%2Fwww.uic.edu%2F&dt=University%20of%20Illinois%20Chicago&en=scroll&_fv=1&_nsi=1&_ss=1&epn.percent_scrolled=90&tfd=700analytics.google.com/g/collect?v=2&... 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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 4925ms · 660KB · $65/mo
www.uic.edu
Other
Costly
Execution 2023ms
Transfer 38 KB
Monthly Cost $27/mo
www.uic.edu
Other
Costly
Execution 1246ms
Transfer 31 KB
Monthly Cost $17/mo
Unattributable
Other
Costly
Execution 525ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 522ms
Transfer 128 KB
Unused 51%
Monthly Cost $7/mo
www.uic.edu
Other
Optional
Execution 193ms
Transfer 87 KB
Unused 45%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 182ms
Transfer 177 KB
Unused 37%
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 130ms
Transfer 21 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 104ms
Transfer 179 KB
Unused 65%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.uic.edu adds 2023ms and costs ~$27/month
  • www.uic.edu adds 1246ms and costs ~$17/month
  • Unattributable adds 525ms and costs ~$7/month
  • Google Tag Manager adds 522ms and costs ~$7/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.

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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.uic.edu takes 2023ms 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

www.uic.edu takes 1246ms 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 525ms 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 522ms 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

51% 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

65% 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

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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