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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
18
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.
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.

6.48 s

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

46.77 s

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

21.32 s

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

0.168

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

18.10 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.

51.57 s

Page Load Progression

707 ms
1.4 s
2.1 s
2.8 s
3.5 s
4.2 s
4.9 s
5.7 s
Checks
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.4 MB transferred, 158 requests
FIX
5.4 MB transferred, 158 requests
Critical::
Page weighs 22.9 MB (5.4 MB transferred)
Warning::
JavaScript is 3.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 3.5 MB
Info::
CSS is 464 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 464 KB
Warning::
158 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.1 g CO2 per page load
5.4 MB / 2.4 MB budget
5.4 MB transferred
158 requests
1.1 g CO2 per page load
JavaScript 3.5 MiB 66%
HTML 544.6 KiB 10%
Other 507.4 KiB 9%
CSS 464.2 KiB 8%
Images 223.8 KiB 4%
Other 64.8 KiB 1%
Fonts 48.3 KiB 1%
Other 4.5 KiB 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

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 (5.4 MiB of 5.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
44499ms total JS execution
FIX
44499ms total JS execution
Warning::
https://www.edx.org/_next/static/chunks/31684-c747...: 27209ms CPU time
Warning::
https://www.edx.org/: 6483ms CPU time
Warning::
Unattributable: 1863ms CPU time
Warning::
https://www.edx.org/_next/static/chunks/77035-cd60...: 1741ms CPU time
Warning::
https://www.edx.org/_next/static/chunks/4bd1b696-8...: 1440ms CPU time
Warning::
Third-party scripts: 44499ms (100% of total)

Main Thread Breakdown

Script Evaluation 74% Other 11% Script Parsing & Compilation 5% Style & Layout 5%
ScriptTotalScriptingParse/CompileParty
https://www.edx.org/_next/static/chunks/31684-c747813ca79ce5e5.js27209ms25941ms26ms3rd
https://www.edx.org/6483ms1249ms607ms3rd
Unattributable1863ms89ms0ms3rd
https://www.edx.org/_next/static/chunks/77035-cd6004d04665d287.js1741ms1450ms290ms3rd
https://www.edx.org/_next/static/chunks/4bd1b696-8114277e1a0c5c1d.js1440ms1016ms53ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js927ms634ms142ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D3KS4KMDT0&cx=c&gtm=4e64e1768ms553ms98ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-543ZGMK2701ms604ms84ms3rd
https://www.edx.org/_next/static/css/c1a0daa9433fa738.css584ms0ms0ms3rd
https://beam.edx.org/scripttemplates/202407.2.0/otBannerSdk.js472ms230ms80ms3rd

Showing top 10 of 25 scripts

F
JS Bundles
Action
64 scripts, 2.1 MB unused
FIX
64 scripts, 2.1 MB unused
Warning::
https://www.edx.org/_next/static/chunks/77035-cd60...: 449 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.edx.org/_next/static/chunks/82c1a80d-a...: 191 KB unused (85%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.gstatic.com/recaptcha/releases/gTpTIWh...: 177 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 2.1 MB
2185 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.edx.org/_next/static/chunks/77035-cd6004d04665d287.js563 KB449 KB (80%)✓3rd
https://www.edx.org/_next/static/chunks/82c1a80d-ae299923ae10f5b2.js227 KB191 KB (85%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js0 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js362 KB177 KB (49%)✓3rd
https://www.edx.org/_next/static/chunks/4cde4f2d-a6ae58bcb4c8999f.js144 KB141 KB (99%)✓3rd
https://www.edx.org/_next/static/chunks/a4634e51-e0ea9966714daeda.js119 KB112 KB (95%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-543ZGMK2166 KB80 KB (48%)✓3rd
https://www.edx.org/_next/static/chunks/aaea2bcf-fcf14465037c204e.js100 KB70 KB (71%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-D3KS4KMDT0&cx=c&gtm=4e64e1180 KB68 KB (38%)✓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

F
Page Weight Inventory
Action
158 resources · 5.4 MB · 2.1 MB savings available
FIX
158 resources · 5.4 MB · 2.1 MB savings available
Warning::
Page weight 4.4 MB over 1MB target
Got: 5.4 MB Expected: ≤ 1 MB
Info::
~2.1 MB of savings available
Warning::
157 third-party resources (100% of weight)
Info::
7 resources over 200KB
158 resources · 5.4 MiB · 157 third-party 4.4 MiB over 1MB target
JavaScript 66% · 3.5 MiB
Other 10% · 566.0 KiB
Document 10% · 544.6 KiB
CSS 9% · 468.9 KiB
Image 4% · 229.6 KiB
Font 1% · 48.3 KiB

~2.1 MiB of savings available

Remove unused JavaScript: 2.1 MiB
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.

B
Image Optimization
20 images, 0 KB saveable
REVIEW
20 images, 0 KB saveable
Info::
All images are well-optimized
20 images 224 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
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
1 fonts (48 KB)
PASS
1 fonts (48 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

48 KB total

Render-blocking

0

of 1

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 FCP 6.5 s LCP 46.8 shttps://www.edx.org/_next/static/media/e4af272ccee01ff0-s.p.woff2e4af272ccee01ff0-s.p.woff2 https://www.edx.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 48.3 KiB — 79 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 79 ms
Start 651 ms
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
8 hints, 0 missing preconnects
PASS
8 hints, 0 missing preconnects
Info::
Page uses 8 resource hint(s)

Current Resource Hints

preconnect
2
preload
6
dns-prefetch
—
prefetch
—

8 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
158 requests over 12016ms
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 FCP 6.5 s LCP 46.8 shttps://edx.org// https://edx.org/ — 301 — 237 B — 281 ms — h2https://www.edx.org/www.edx.org/ https://www.edx.org/ — 200 — 516.9 KiB — 394 ms — h2https://www.edx.org/_next/static/media/e4af272ccee01ff0-s.p.woff2www.edx.org/_next/static/media/e4af... https://www.edx.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.3 KiB — 79 ms — h2https://www.edx.org/_next/static/css/afed01e5a59cf782.csswww.edx.org/_next/static/css/afed01... https://www.edx.org/_next/static/css/afed01e5a59cf782.css — 200 — 1.7 KiB — 63 ms — h2https://www.edx.org/_next/static/css/c1a0daa9433fa738.csswww.edx.org/_next/static/css/c1a0da... https://www.edx.org/_next/static/css/c1a0daa9433fa738.css — 200 — 308.5 KiB — 114 ms — h2https://www.edx.org/_next/static/css/63827c4f45aec93f.csswww.edx.org/_next/static/css/63827c... https://www.edx.org/_next/static/css/63827c4f45aec93f.css — 200 — 1.1 KiB — 60 ms — h2https://www.edx.org/_next/static/css/8d3c32105a4dd1a6.csswww.edx.org/_next/static/css/8d3c32... https://www.edx.org/_next/static/css/8d3c32105a4dd1a6.css — 200 — 73.3 KiB — 111 ms — h2https://www.edx.org/_next/static/css/e5fec6745b51671e.csswww.edx.org/_next/static/css/e5fec6... https://www.edx.org/_next/static/css/e5fec6745b51671e.css — 200 — 14.9 KiB — 65 ms — h2https://www.edx.org/_next/static/css/622ea16a66844b51.csswww.edx.org/_next/static/css/622ea1... https://www.edx.org/_next/static/css/622ea16a66844b51.css — 200 — 3.0 KiB — 74 ms — h2https://www.edx.org/_next/static/css/7201a3f57b93e520.csswww.edx.org/_next/static/css/7201a3... https://www.edx.org/_next/static/css/7201a3f57b93e520.css — 200 — 2.4 KiB — 71 ms — h2https://www.edx.org/_next/static/css/619a486fdabe4db9.csswww.edx.org/_next/static/css/619a48... https://www.edx.org/_next/static/css/619a486fdabe4db9.css — 200 — 1.9 KiB — 75 ms — h2https://www.edx.org/_next/static/css/b7125049fdf54480.csswww.edx.org/_next/static/css/b71250... https://www.edx.org/_next/static/css/b7125049fdf54480.css — 200 — 1.5 KiB — 77 ms — h2https://www.edx.org/_next/static/css/838d848756a3dba0.csswww.edx.org/_next/static/css/838d84... https://www.edx.org/_next/static/css/838d848756a3dba0.css — 200 — 1.3 KiB — 80 ms — h2https://www.edx.org/_next/static/css/5e9f44976815350e.csswww.edx.org/_next/static/css/5e9f44... https://www.edx.org/_next/static/css/5e9f44976815350e.css — 200 — 5.8 KiB — 82 ms — h2https://www.edx.org/_next/static/css/1e97b410b545a5d8.csswww.edx.org/_next/static/css/1e97b4... https://www.edx.org/_next/static/css/1e97b410b545a5d8.css — 200 — 6.7 KiB — 85 ms — h2https://www.edx.org/api/auto-block?id=fa169e97-be64-4cc1-bad3-9534590f9a30www.edx.org/api/auto-block?id=fa169... https://www.edx.org/api/auto-block?id=fa169e97-be64-4cc1-bad3-9534590f9a30 — 200 — 93.4 KiB — 587 ms — h2https://beam.edx.org/scripttemplates/otSDKStub.jsbeam.edx.org/scripttemplates/otSDKS... https://beam.edx.org/scripttemplates/otSDKStub.js — 200 — 9.3 KiB — 339 ms — h2https://www.edx.org/_next/static/chunks/webpack-a94bbd5414b620ac.jswww.edx.org/_next/static/chunks/web... https://www.edx.org/_next/static/chunks/webpack-a94bbd5414b620ac.js — 200 — 26.0 KiB — 110 ms — h2https://www.edx.org/_next/static/chunks/4bd1b696-8114277e1a0c5c1d.jswww.edx.org/_next/static/chunks/4bd... https://www.edx.org/_next/static/chunks/4bd1b696-8114277e1a0c5c1d.js — 200 — 53.8 KiB — 119 ms — h2https://www.edx.org/_next/static/chunks/31684-c747813ca79ce5e5.jswww.edx.org/_next/static/chunks/316... https://www.edx.org/_next/static/chunks/31684-c747813ca79ce5e5.js — 200 — 46.5 KiB — 109 ms — h2https://www.edx.org/_next/static/chunks/main-app-53c3f9f4fa7e7bfb.jswww.edx.org/_next/static/chunks/mai... https://www.edx.org/_next/static/chunks/main-app-53c3f9f4fa7e7bfb.js — 200 — 1.3 KiB — 98 ms — h2https://www.edx.org/_next/static/chunks/app/global-error-b9cdfd2b84c7c73b.jswww.edx.org/_next/static/chunks/app... https://www.edx.org/_next/static/chunks/app/global-error-b9cdfd2b84c7c73b.js — 200 — 3.6 KiB — 168 ms — h2https://www.edx.org/_next/static/chunks/0e5ce63c-06e5288fb0bdde32.jswww.edx.org/_next/static/chunks/0e5... https://www.edx.org/_next/static/chunks/0e5ce63c-06e5288fb0bdde32.js — 200 — 3.7 KiB — 112 ms — h2https://www.edx.org/_next/static/chunks/c233e9bd-b7c9422fb889c5f2.jswww.edx.org/_next/static/chunks/c23... https://www.edx.org/_next/static/chunks/c233e9bd-b7c9422fb889c5f2.js — 200 — 10.0 KiB — 100 ms — h2https://www.edx.org/_next/static/chunks/23088-5b0cccbcd59cb193.jswww.edx.org/_next/static/chunks/230... https://www.edx.org/_next/static/chunks/23088-5b0cccbcd59cb193.js — 200 — 21.8 KiB — 147 ms — h2https://www.edx.org/_next/static/chunks/6874-761b0feea70cad7a.jswww.edx.org/_next/static/chunks/687... https://www.edx.org/_next/static/chunks/6874-761b0feea70cad7a.js — 200 — 4.0 KiB — 134 ms — h2https://www.edx.org/_next/static/chunks/59054-16d2c77acd8419e5.jswww.edx.org/_next/static/chunks/590... https://www.edx.org/_next/static/chunks/59054-16d2c77acd8419e5.js — 200 — 12.9 KiB — 113 ms — h2https://www.edx.org/_next/static/chunks/33063-273ea9b69895ce90.jswww.edx.org/_next/static/chunks/330... https://www.edx.org/_next/static/chunks/33063-273ea9b69895ce90.js — 200 — 6.2 KiB — 126 ms — h2https://www.edx.org/_next/static/chunks/94466-1f4eaaf7e4c46361.jswww.edx.org/_next/static/chunks/944... https://www.edx.org/_next/static/chunks/94466-1f4eaaf7e4c46361.js — 200 — 49.1 KiB — 158 ms — h2https://www.edx.org/_next/static/chunks/43145-424523c8bdc43658.jswww.edx.org/_next/static/chunks/431... https://www.edx.org/_next/static/chunks/43145-424523c8bdc43658.js — 200 — 13.5 KiB — 273 ms — h2
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 FCP 6.5 s LCP 46.8 shttps://edx.org// https://edx.org/ — 301 — 237 B — 281 ms — h2https://www.edx.org/www.edx.org/ https://www.edx.org/ — 200 — 516.9 KiB — 394 ms — h2https://www.edx.org/_next/static/media/e4af272ccee01ff0-s.p.woff2www.edx.org/_next/static/media/e4af... https://www.edx.org/_next/static/media/e4af272ccee01ff0-s.p.woff2 — 200 — 48.3 KiB — 79 ms — h2https://www.edx.org/_next/static/css/afed01e5a59cf782.csswww.edx.org/_next/static/css/afed01... https://www.edx.org/_next/static/css/afed01e5a59cf782.css — 200 — 1.7 KiB — 63 ms — h2https://www.edx.org/_next/static/css/c1a0daa9433fa738.csswww.edx.org/_next/static/css/c1a0da... https://www.edx.org/_next/static/css/c1a0daa9433fa738.css — 200 — 308.5 KiB — 114 ms — h2https://www.edx.org/_next/static/css/63827c4f45aec93f.csswww.edx.org/_next/static/css/63827c... 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— h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/authxLogistrationSplit/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/authxLogistrationSplit/evaluations — 200 — 843 B — 268 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/homepageOptimizationTestV3/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/homepageOptimizationTestV3/evaluations — 200 — 3.0 KiB — 262 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/gtmSpotlightCarousel/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/gtmSpotlightCarousel/evaluations — 200 — 1.6 KiB — 265 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/productCardRedesignTest/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/productCardRedesignTest/evaluations — 200 — 1.1 KiB — 268 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/guidedPathVsDynamicFlow/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/guidedPathVsDynamicFlow/evaluations — 200 — 846 B — 267 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/getStartedWithModule/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/getStartedWithModule/evaluations — 200 — 1.4 KiB — 99 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/homepagePromoBanner/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/homepagePromoBanner/evaluations — 200 — 843 B — 98 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/homepageStatsAndSocialProof/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/homepageStatsAndSocialProof/evaluations — 200 — 1.5 KiB — 271 ms — h2https://www.edx.org/api/product-summarieswww.edx.org/api/product-summaries https://www.edx.org/api/product-summaries — 200 — 4.4 KiB — 227 ms — h2https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/findYourPath/evaluationswww.edx.org/beam/api/v2/sources/bda... https://www.edx.org/beam/api/v2/sources/bdac7c16-924e-4180-bb35-5b2dfff6d308/rules/findYourPath/evaluations — 200 — 1.4 KiB — 103 ms — h2https://igsyv1z1xi-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia%20for%20JavaScript%20(5.0.0)%3B%20Search%20(5.0.0)%3B%20Browser%3B%20instantsearch.js%20(4.78.1)%3B%20react%20(19.1.0-canary-029e8bd6-20250306)%3B%20react-instantsearch%20(7.15.5)%3B%20react-instantsearch-core%20(7.15.5)%3B%20next.js%20(15.2.9)%3B%20JS%20Helper%20(3.24.3)&x-algolia-api-key=6658746ce52e30dacfdd8ba5f8e8cf18&x-algolia-application-id=IGSYV1Z1XIigsyv1z1xi-dsn.algolia.net/1/indexe... https://igsyv1z1xi-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=Algolia%20for%20JavaScript%20(5.0.0)%3B%20Search%20(5.0.0)%3B%20Browser%3B%20instantsearch.js%20(4.78.1)%3B%20react%20(19.1.0-canary-029e8bd6-20250306)%3B%20react-instantsearch%20(7.15.5)%3B%20react-instantsearch-core%20(7.15.5)%3B%20next.js%20(15.2.9)%3B%20JS%20Helper%20(3.24.3)&x-algolia-api-key=6658746ce52e30dacfdd8ba5f8e8cf18&x-algolia-application-id=IGSYV1Z1XI — 200 — 9.8 KiB — 359 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogo_override%2F2e4b62c7-72eb-4e36-b016-e94aeb89acef-b4654d7c917b.png&w=256&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogo_override%2F2e4b62c7-72eb-4e36-b016-e94aeb89acef-b4654d7c917b.png&w=256&q=75 — 200 — 2.7 KiB — 62 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogo_override%2F715dd147-f76d-4b42-9f26-222a990055e7-8560d8f0f00a.png&w=256&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogo_override%2F715dd147-f76d-4b42-9f26-222a990055e7-8560d8f0f00a.png&w=256&q=75 — 200 — 5.8 KiB — 70 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2F2e4b62c7-72eb-4e36-b016-e94aeb89acef-a013be9d8cef.jpg&w=640&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2F2e4b62c7-72eb-4e36-b016-e94aeb89acef-a013be9d8cef.jpg&w=640&q=75 — 200 — 19.5 KiB — 65 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2F715dd147-f76d-4b42-9f26-222a990055e7-2f4c1ac89f77.jpg&w=640&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2F715dd147-f76d-4b42-9f26-222a990055e7-2f4c1ac89f77.jpg&w=640&q=75 — 200 — 10.6 KiB — 168 ms — h2https://bam.nr-data.net/events/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10484&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59abam.nr-data.net/events/1/NRBR-446e0... https://bam.nr-data.net/events/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10484&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59a — 200 — 413 B — 90 ms — http/1.1https://bam.nr-data.net/jserrors/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10488&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59a&ri=%7B%227045944734d26f50ac7bb4ac1a6c16efd49c23ab%22:%227045944734d26f50ac7bb4ac1a6c16efd49c23ab%22%7Dbam.nr-data.net/jserrors/1/NRBR-446... https://bam.nr-data.net/jserrors/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10488&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59a&ri=%7B%227045944734d26f50ac7bb4ac1a6c16efd49c23ab%22:%227045944734d26f50ac7bb4ac1a6c16efd49c23ab%22%7D — 200 — 413 B — 124 ms — http/1.1https://bam.nr-data.net/events/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10493&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59abam.nr-data.net/events/1/NRBR-446e0... https://bam.nr-data.net/events/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10493&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59a — 200 — 413 B — 105 ms — http/1.1https://bam.nr-data.net/events/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10497&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59abam.nr-data.net/events/1/NRBR-446e0... https://bam.nr-data.net/events/1/NRBR-446e0822169cc62f155?a=574099970&v=1.312.1&to=ZwNVMRNUC0QHVEMICl5JYAADcxdWC1JADhdbM0UMTnsATxJdRE4idTIYSjpZClQHW1I8Sms9GUtPRQRDDmpq&rst=10497&ck=0&s=94bbac574e827711&ref=https://www.edx.org/&ptid=8a55e67b62fba59a — 200 — 413 B — 98 ms — http/1.1https://www.edx.org/_next/image?url=%2Ficons%2Fai-icon.png&w=96&q=75www.edx.org/_next/image?url=%2Ficon... https://www.edx.org/_next/image?url=%2Ficons%2Fai-icon.png&w=96&q=75 — 200 — 1.8 KiB — 69 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-225044b5951fd9dcf1a878bdbd8d96bba01b5d8eee25f.jpg&w=1080&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-225044b5951fd9dcf1a878bdbd8d96bba01b5d8eee25f.jpg&w=1080&q=75 — 200 — 57.9 KiB — 66 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2Ff11c9289-596e-4c46-a9cb-318052f259ae-0b7656599f64.jpeg&w=640&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2Ff11c9289-596e-4c46-a9cb-318052f259ae-0b7656599f64.jpeg&w=640&q=75 — 200 — 42.4 KiB — 52 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogos%2F87b07564-d569-4cfd-bee6-8b0a407acb73-dc33e4b5f353.png&w=256&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogos%2F87b07564-d569-4cfd-bee6-8b0a407acb73-dc33e4b5f353.png&w=256&q=75 — 200 — 2.0 KiB — 70 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2F324970b7-03a4-44d7-b39e-10bbda6f119f-6087e3f8810e.jpeg&w=640&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Fcdn-cgi%2Fimage%2Fwidth%3Dauto%2Cheight%3Dauto%2Cquality%3D75%2Cformat%3Dwebp%2Fmedia%2Fcourse%2Fimage%2F324970b7-03a4-44d7-b39e-10bbda6f119f-6087e3f8810e.jpeg&w=640&q=75 — 200 — 29.1 KiB — 67 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogos%2F2a73d2ce-c34a-4e08-8223-83bca9d2f01d-d4f180052205.png&w=256&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogos%2F2a73d2ce-c34a-4e08-8223-83bca9d2f01d-d4f180052205.png&w=256&q=75 — 200 — 3.9 KiB — 55 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-27642Background-4.png&w=750&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-27642Background-4.png&w=750&q=75 — 200 — 18.6 KiB — 58 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-225044b5951fd9dcf1a878bdbd8d96bba01b5d8eee25f.jpg&w=1080&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-225044b5951fd9dcf1a878bdbd8d96bba01b5d8eee25f.jpg&w=1080&q=75 — 200 — 1.1 KiB — 43 ms — h2https://www.edx.org/_next/image?url=%2Ficons%2Fai-icon.png&w=96&q=75www.edx.org/_next/image?url=%2Ficon... https://www.edx.org/_next/image?url=%2Ficons%2Fai-icon.png&w=96&q=75 — 200 — 1.1 KiB — 66 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-27642Background-4.png&w=750&q=75www.edx.org/_next/image?url=https%3... https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-27642Background-4.png&w=750&q=75 — 200 — 1.1 KiB — 63 ms — h2
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 44499ms · 2789KB · €773/mo
www.edx.org
Other
Costly
Execution 27209ms
Transfer 46 KB
Monthly Cost €472/mo
www.edx.org
Other
Costly
Execution 6483ms
Transfer 458 KB
Monthly Cost €113/mo
Unattributable
Other
Costly
Execution 1863ms
Transfer 0 KB
Monthly Cost €32/mo
www.edx.org
Other
Costly
Execution 1741ms
Transfer 563 KB
Unused 80%
Monthly Cost €30/mo
www.edx.org
Other
Costly
Execution 1440ms
Transfer 54 KB
Monthly Cost €25/mo
www.gstatic.com
Other
Costly
Execution 927ms
Transfer 0 KB
Unused 49%
Monthly Cost €16/mo
Google Tag Manager
Tag Manager
Costly
Execution 768ms
Transfer 180 KB
Unused 38%
Monthly Cost €13/mo
Google Tag Manager
Tag Manager
Costly
Execution 701ms
Transfer 166 KB
Unused 48%
Monthly Cost €12/mo
www.edx.org
Other
Costly
Execution 584ms
Transfer 309 KB
Monthly Cost €10/mo
beam.edx.org
Other
Costly
Execution 472ms
Transfer 110 KB
Unused 60%
Monthly Cost €8/mo
www.edx.org
Other
Costly
Execution 362ms
Transfer 35 KB
Monthly Cost €6/mo
js-agent.newrelic.com
Other
Costly
Execution 334ms
Transfer 30 KB
Monthly Cost €6/mo
www.edx.org
Other
Costly
Execution 286ms
Transfer 93 KB
Monthly Cost €5/mo
www.edx.org
Other
Costly
Execution 284ms
Transfer 7 KB
Monthly Cost €5/mo
www.edx.org
Other
Costly
Execution 202ms
Transfer 94 KB
Unused 67%
Monthly Cost €4/mo
www.edx.org
Other
Optional
Execution 174ms
Transfer 24 KB
Monthly Cost €3/mo
www.edx.org
Other
Optional
Execution 113ms
Transfer 227 KB
Unused 85%
Monthly Cost €2/mo
beam.edx.org
Other
Optional
Execution 96ms
Transfer 9 KB
Monthly Cost €2/mo
www.edx.org
Other
Optional
Execution 89ms
Transfer 13 KB
Monthly Cost €2/mo
sonic-ui.highereducation.com
Other
Optional
Execution 84ms
Transfer 21 KB
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 67ms
Transfer 57 KB
Unused 100%
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 58ms
Transfer 119 KB
Unused 95%
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 58ms
Transfer 144 KB
Unused 99%
Monthly Cost €1/mo
app.link
Other
Optional
Execution 54ms
Transfer 1 KB
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 50ms
Transfer 27 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.edx.org adds 27209ms and costs ~€472/month
  • www.edx.org adds 6483ms and costs ~€113/month
  • Unattributable adds 1863ms and costs ~€32/month
  • www.edx.org adds 1741ms and costs ~€30/month
  • www.edx.org adds 1440ms and costs ~€25/month
  • www.gstatic.com adds 927ms and costs ~€16/month
  • Google Tag Manager adds 768ms and costs ~€13/month
  • Google Tag Manager adds 701ms and costs ~€12/month
  • www.edx.org adds 584ms and costs ~€10/month
  • beam.edx.org adds 472ms and costs ~€8/month
  • www.edx.org adds 362ms and costs ~€6/month
  • js-agent.newrelic.com adds 334ms and costs ~€6/month
  • www.edx.org adds 286ms and costs ~€5/month
  • www.edx.org adds 284ms and costs ~€5/month
  • www.edx.org adds 202ms 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.edx.org takes 27209ms 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.edx.org takes 6483ms 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 1863ms 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.edx.org takes 1741ms 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

80% of www.edx.org'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

www.edx.org takes 1440ms 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.gstatic.com takes 927ms 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 768ms 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 701ms 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.edx.org takes 584ms 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

beam.edx.org takes 472ms 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

60% of beam.edx.org'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

www.edx.org takes 362ms 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

js-agent.newrelic.com takes 334ms 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.edx.org takes 286ms 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.edx.org takes 284ms 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.edx.org takes 202ms 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

67% of www.edx.org'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

85% of www.edx.org'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

100% of www.edx.org'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

95% of www.edx.org'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

99% of www.edx.org'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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