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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

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

51
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.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
91
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.

669 ms

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

5.36 s

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

103 ms

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

0.361

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.

5.36 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
15
6 PASS 3 REVIEW 4 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 687.0 KiB 27%
CSS 403.2 KiB 16%
Images 351.3 KiB 14%
Fonts 91.0 KiB 4%
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
D
Page Weight Inventory
Action
74 resources · 2.5 MB · 286 KB savings available
FIX
74 resources · 2.5 MB · 286 KB savings available
Warning::
Page weight 1.5 MB over 1MB target
Got: 2.5 MB Expected: ≤ 1 MB
Info::
~286 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 27% · 687.0 KiB
CSS 16% · 403.2 KiB
Image 15% · 381.7 KiB
Font 4% · 91.0 KiB
Document 1% · 38.3 KiB

~285.7 KiB of savings available

Remove unused JavaScript: 285.7 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 Execution Cost
Action
1224ms total JS execution
REVIEW
1224ms total JS execution
Warning::
https://www.uic.edu/: 535ms CPU time
Warning::
https://www.uic.edu/js/app.6ba5d18c.js: 272ms CPU time
Info::
Unattributable: 152ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-T6L...: 139ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-T2YV...: 73ms CPU time
Warning::
Third-party scripts: 1224ms (100% of total)

Main Thread Breakdown

Other 34% Script Evaluation 29% Style & Layout 15% Script Parsing & Compilation 8% Parse HTML & CSS 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://www.uic.edu/535ms3ms1ms3rd
https://www.uic.edu/js/app.6ba5d18c.js272ms193ms3ms3rd
Unattributable152ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-T6LXVFW139ms86ms43ms3rd
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&cx=c&_slc=173ms55ms17ms3rd
https://www.uic.edu/js/vendors~app.bff880a0.js53ms6ms8ms3rd
C
JS Bundles
Action
15 scripts, 286 KB unused
REVIEW
15 scripts, 286 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T2YV...: 115 KB unused (65%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-T2YV...: 67 KB unused (38%)
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: 286 KB
286 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&l=dataLayer&cx=c177 KB115 KB (65%)3rd
https://www.googletagmanager.com/gtag/js?id=G-T2YV1VZP5R&cx=c&_slc=1179 KB67 KB (38%)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 KB3rd
https://www.uic.edu/js/skipto.min.js12 KB3rd
https://cdn.mouseflow.com/projects/4f7b7910-6e13-4b4e-b9ff-cf52335fbf91.js0 KB3rd
https://player.vimeo.com/api/player-2.18.0.js7 KB3rd
https://www.uic.edu/js/app.6ba5d18c.js31 KB3rd
https://uic-emergency-alert-banner.azurewebsites.net/api/UICEmergencyAlertUI?code=0fasjkGLOoMn422JuxiUMgQu-2TG5atiS_l6FD2jZipzAzFus8U1kg==0 KB3rd

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
4 images, 0 KB saveable
PASS
4 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.
4 images 351 KB
0 oversized -0 KB
0 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

A+
Font Loading
4 fonts (91 KB)
PASS
4 fonts (91 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

91 KB total

Render-blocking

0

of 4

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 4.0 s 5.0 s FCP 669 ms LCP 5.4 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 — 6 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 — 4 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 — 168 ms — font-display: swapdata:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFiEABMAAAAA2FgAAFgUAAMAgwAAAAAAAAAAAA…font-woff2;charset=utf-... data:application/font-woff2;charset=utf-8;base64,d09GMgABAAAAAFiEABMAAAAA2FgAAFgUAAMAgwAAAAAAAAAAAA… — 22.1 KiB — 6 ms — font-display: swap
font-woff2;charset=utf-... woff2 swap
Size 23 KB
Load time 6 ms
Start 660 ms
Risk FOUT — text flashes from fallback to web font
font-woff2;charset=utf-... woff2 swap
Size 23 KB
Load time 4 ms
Start 663 ms
Risk FOUT — text flashes from fallback to web font
font-woff2;charset=utf-... woff2 swap
Size 23 KB
Load time 168 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
font-woff2;charset=utf-... woff2 swap
Size 22 KB
Load time 6 ms
Start 3.3 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
Network Waterfall
74 requests over 4680ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 669 ms LCP 5.4 shttps://uic.edu// https://uic.edu/ — 301 — 153 B — 113 ms — h2https://www.uic.edu/www.uic.edu/ https://www.uic.edu/ — 200 — 38.1 KiB — 143 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 — 130 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 — 178.8 KiB — 77 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 27 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 — 264 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 — 74 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 — 86.7 KiB — 79 ms — h2https://www.uic.edu/js/skipto.min.jswww.uic.edu/js/skipto.min.js https://www.uic.edu/js/skipto.min.js — 200 — 11.6 KiB — 95 ms — h2https://www.uic.edu/sri-fallback.jswww.uic.edu/sri-fallback.js https://www.uic.edu/sri-fallback.js — 200 — 740 B — 131 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 — 32 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 — 84 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 — 389 B — 225 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 — 80 ms — h2https://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 — 210 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://www.uic.edu/manifest.jsonwww.uic.edu/manifest.json https://www.uic.edu/manifest.json — 200 — 966 B — 104 ms — http/1.1https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.jsonetrust.techservices.illinois.edu/... https://onetrust.techservices.illinois.edu/scripttemplates/otSDKStub.js — 200 — 5.8 KiB — 315 ms — h2https://siteimproveanalytics.com/js/siteanalyze_2950.jssiteimproveanalytics.com/js/siteana... https://siteimproveanalytics.com/js/siteanalyze_2950.js — 200 — 780 B — 29 ms — h3https://cms.uic.edu/wp-json/menuscms.uic.edu/wp-json/menus https://cms.uic.edu/wp-json/menus — 200 — 0 B — 199 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 — 383 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 — 205 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 — 375 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 — 384 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 — 213 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 — 6 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 — 4 ms — datahttps://cms.uic.edu/wp-json/menuscms.uic.edu/wp-json/menus https://cms.uic.edu/wp-json/menus — 200 — 7.1 KiB — 284 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 — 33.1 KiB — 533 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 669 ms LCP 5.4 shttps://uic.edu// https://uic.edu/ — 301 — 153 B — 113 ms — h2https://www.uic.edu/www.uic.edu/ https://www.uic.edu/ — 200 — 38.1 KiB — 143 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 — 130 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 — 178.8 KiB — 77 ms — h2https://www.google-analytics.com/analytics.jswww.google-analytics.com/analytics.... https://www.google-analytics.com/analytics.js — 200 — 20.9 KiB — 27 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 — 264 ms — h2https://www.uic.edu/js/app.6ba5d18c.jswww.uic.edu/js/app.6ba5d18c.js 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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 1224ms · 463KB · $16/mo
www.uic.edu
Other
Costly
Execution 535ms
Transfer 38 KB
Monthly Cost $7/mo
www.uic.edu
Other
Costly
Execution 272ms
Transfer 31 KB
Monthly Cost $4/mo
Unattributable
Other
Optional
Execution 152ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 139ms
Transfer 128 KB
Unused 51%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 179 KB
Unused 38%
Monthly Cost $1/mo
www.uic.edu
Other
Optional
Execution 53ms
Transfer 87 KB
Unused 45%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.uic.edu adds 535ms and costs ~$7/month
  • www.uic.edu adds 272ms 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.uic.edu takes 535ms 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 272ms 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

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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