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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
67
GRADE
D
FIX
6
REVIEW
2
PASS
5
INFO
2

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

31
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.

1.33 s

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

10.12 s

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

4.93 s

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

0.048

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

6.73 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.

11.03 s

Page Load Progression

1.2 s
2.4 s
3.7 s
4.9 s
6.1 s
7.3 s
8.5 s
9.8 s
Checks
15
5 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
5.7 MB transferred, 201 requests
FIX
5.7 MB transferred, 201 requests
Critical::
Page weighs 23.3 MB (5.7 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::
201 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.2 g CO2 per page load
5.7 MB / 2.4 MB budget
5.7 MB transferred
201 requests
1.2 g CO2 per page load
JavaScript 3.5 MiB 62%
Images 588.4 KiB 10%
HTML 544.3 KiB 9%
Other 540.3 KiB 9%
CSS 464.1 KiB 8%
Other 49.4 KiB 1%
Fonts 48.4 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 (5.7 MiB of 5.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
11954ms total JS execution
FIX
11954ms total JS execution
Warning::
https://www.edx.org/_next/static/chunks/31684-c747...: 7474ms CPU time
Warning::
https://www.edx.org/: 1704ms CPU time
Warning::
https://www.edx.org/_next/static/chunks/4bd1b696-8...: 578ms CPU time
Warning::
Unattributable: 452ms CPU time
Warning::
https://www.edx.org/_next/static/chunks/77035-cd60...: 434ms CPU time
Warning::
Third-party scripts: 11954ms (100% of total)

Main Thread Breakdown

Script Evaluation 74% Other 10% Style & Layout 6% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://www.edx.org/_next/static/chunks/31684-c747813ca79ce5e5.js7474ms7096ms18ms3rd
https://www.edx.org/1704ms335ms159ms3rd
https://www.edx.org/_next/static/chunks/4bd1b696-8114277e1a0c5c1d.js578ms413ms23ms3rd
Unattributable452ms21ms0ms3rd
https://www.edx.org/_next/static/chunks/77035-cd6004d04665d287.js434ms360ms74ms3rd
https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js225ms178ms35ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-543ZGMK2220ms180ms34ms3rd
https://www.googletagmanager.com/gtag/js?id=G-D3KS4KMDT0&cx=c&gtm=4e64e1212ms140ms24ms3rd
https://www.edx.org/_next/static/css/c1a0daa9433fa738.css145ms0ms0ms3rd
https://js-agent.newrelic.com/nr-spa-1.312.1.min.js112ms89ms6ms3rd

Showing top 10 of 15 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
2183 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
201 resources · 5.7 MB · 2.1 MB savings available
FIX
201 resources · 5.7 MB · 2.1 MB savings available
Warning::
Page weight 4.7 MB over 1MB target
Got: 5.7 MB Expected: ≤ 1 MB
Info::
~2.1 MB of savings available
Warning::
200 third-party resources (100% of weight)
Info::
7 resources over 200KB
201 resources · 5.7 MiB · 200 third-party 4.7 MiB over 1MB target
JavaScript 62% · 3.5 MiB
Image 10% · 594.3 KiB
Other 10% · 583.5 KiB
Document 9% · 544.3 KiB
CSS 8% · 468.9 KiB
Font 1% · 48.4 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
63 images, 0 KB saveable
REVIEW
63 images, 0 KB saveable
Info::
All images are well-optimized
63 images 588 KB
0 oversized -0 KB
4 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 FCP 1.3 s LCP 10.1 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 — 48.4 KiB — 75 ms — font-display: swap
e4af272ccee01ff0-s.p.woff2 woff2 swap
Size 48 KB
Load time 75 ms
Start 649 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
201 requests over 13194ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 1.3 s LCP 10.1 shttps://edx.org// https://edx.org/ — 301 — 238 B — 287 ms — h2https://www.edx.org/www.edx.org/ https://www.edx.org/ — 200 — 516.8 KiB — 391 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 — 48.4 KiB — 75 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 — 95 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 — 142 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 — 72 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 — 95 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 — 53 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 — 86 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 — 96 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 — 91 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 — 93 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 — 87 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 — 81 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 — 78 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 — 93.5 KiB — 724 ms — h2https://beam.edx.org/scripttemplates/otSDKStub.jsbeam.edx.org/scripttemplates/otSDKS... https://beam.edx.org/scripttemplates/otSDKStub.js — 200 — 9.3 KiB — 443 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 — 92 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 — 78 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 — 97 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 — 66 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 — 127 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 — 123 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 — 129 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 — 122 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 — 115 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 — 13.0 KiB — 151 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 — 119 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 — 168 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 — 191 ms — h2
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 1.3 s LCP 10.1 shttps://edx.org// https://edx.org/ — 301 — 238 B — 287 ms — h2https://www.edx.org/www.edx.org/ https://www.edx.org/ — 200 — 516.8 KiB — 391 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 — 48.4 KiB — 75 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 — 95 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 — 142 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 — 72 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 — 95 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 — 53 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 — 86 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 — 96 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 — 91 ms — 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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=384&q=75 — 200 — 17.4 KiB — 67 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=128&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=128&q=75 — 200 — 2.0 KiB — 82 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=384&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=384&q=75 — 200 — 16.5 KiB — 63 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=128&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=128&q=75 — 200 — 3.5 KiB — 55 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-27642Background-4.png&w=1920&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=1920&q=75 — 200 — 67.3 KiB — 59 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogos%2F2b6a09a3-61a9-415b-9048-cf90451c6bb2-681cbc2f42ed.png&w=128&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%2F2b6a09a3-61a9-415b-9048-cf90451c6bb2-681cbc2f42ed.png&w=128&q=75 — 200 — 4.1 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%2F5f1c55b4-354e-4155-af4a-76450953e10d-7e2641a8e04e.jpeg&w=384&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%2F5f1c55b4-354e-4155-af4a-76450953e10d-7e2641a8e04e.jpeg&w=384&q=75 — 200 — 14.4 KiB — 58 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fprod-discovery.edx-cdn.org%2Forganization%2Flogos%2Ffaaf3d47-e4af-4da6-8cb8-c7051d7b1572-0d113e57e4e4.png&w=128&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%2Ffaaf3d47-e4af-4da6-8cb8-c7051d7b1572-0d113e57e4e4.png&w=128&q=75 — 200 — 3.5 KiB — 59 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%2F9711b45f-6075-4299-86fd-1cf2ee7bc778-63c4f2f37559.png&w=384&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%2F9711b45f-6075-4299-86fd-1cf2ee7bc778-63c4f2f37559.png&w=384&q=75 — 200 — 8.2 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%2Fea33caa5-e1bc-49f4-a4b0-af629b2db110-befb91f8b6ed.png&w=384&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%2Fea33caa5-e1bc-49f4-a4b0-af629b2db110-befb91f8b6ed.png&w=384&q=75 — 200 — 12.1 KiB — 386 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%2F00b2f427-aeaa-4931-ba7b-e679197b5bbe-a051242af5da.jpeg&w=384&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%2F00b2f427-aeaa-4931-ba7b-e679197b5bbe-a051242af5da.jpeg&w=384&q=75 — 200 — 10.3 KiB — 71 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%2F802013b0-3d05-46bb-9f8d-74873d8099d9-e03450fc651b.png&w=384&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%2F802013b0-3d05-46bb-9f8d-74873d8099d9-e03450fc651b.png&w=384&q=75 — 200 — 16.2 KiB — 193 ms — h2https://www.edx.org/_next/image?url=%2Ficons%2Fai-icon.png&w=48&q=75www.edx.org/_next/image?url=%2Ficon... https://www.edx.org/_next/image?url=%2Ficons%2Fai-icon.png&w=48&q=75 — 200 — 1.1 KiB — 71 ms — h2https://www.edx.org/_next/image?url=https%3A%2F%2Fimages.cdn.edx.org%2Fattachment-27642Background-4.png&w=1920&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=1920&q=75 — 200 — 1.1 KiB — 61 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 11954ms · 2145KB · €208/mo
www.edx.org
Other
Costly
Execution 7474ms
Transfer 46 KB
Monthly Cost €130/mo
www.edx.org
Other
Costly
Execution 1704ms
Transfer 457 KB
Monthly Cost €30/mo
www.edx.org
Other
Costly
Execution 578ms
Transfer 54 KB
Monthly Cost €10/mo
Unattributable
Other
Costly
Execution 452ms
Transfer 0 KB
Monthly Cost €8/mo
www.edx.org
Other
Costly
Execution 434ms
Transfer 563 KB
Unused 80%
Monthly Cost €8/mo
www.gstatic.com
Other
Costly
Execution 225ms
Transfer 0 KB
Unused 49%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 220ms
Transfer 166 KB
Unused 48%
Monthly Cost €4/mo
Google Tag Manager
Tag Manager
Costly
Execution 212ms
Transfer 180 KB
Unused 38%
Monthly Cost €4/mo
www.edx.org
Other
Optional
Execution 145ms
Transfer 308 KB
Monthly Cost €3/mo
js-agent.newrelic.com
Other
Optional
Execution 112ms
Transfer 30 KB
Monthly Cost €2/mo
beam.edx.org
Other
Optional
Execution 103ms
Transfer 110 KB
Unused 60%
Monthly Cost €2/mo
www.edx.org
Other
Optional
Execution 85ms
Transfer 35 KB
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 81ms
Transfer 6 KB
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 65ms
Transfer 93 KB
Monthly Cost €1/mo
www.edx.org
Other
Optional
Execution 63ms
Transfer 94 KB
Unused 67%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.edx.org adds 7474ms and costs ~€130/month
  • www.edx.org adds 1704ms and costs ~€30/month
  • www.edx.org adds 578ms and costs ~€10/month
  • Unattributable adds 452ms and costs ~€8/month
  • www.edx.org adds 434ms and costs ~€8/month
  • www.gstatic.com adds 225ms and costs ~€4/month
  • Google Tag Manager adds 220ms and costs ~€4/month
  • Google Tag Manager adds 212ms 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 7474ms 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 1704ms 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 578ms 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 452ms 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 434ms 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.gstatic.com takes 225ms 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 220ms 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

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

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

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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