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https://edutopia.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
6
REVIEW
1
PASS
8
INFO
2

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

Mobile Desktop
38
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
87
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

3.17 s

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

12.91 s

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

1.95 s

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

0.006

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

4.87 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.

14.27 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 1 REVIEW 6 FIX
D
Page Weight Budget
Action
2.1 MB transferred, 50 requests
FIX
2.1 MB transferred, 50 requests
Info::
Page weighs 5.2 MB (2.1 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
50 HTTP requests
Info::
Estimated 0.44 g CO2 per page load
2.1 MB / 2.4 MB budget
2.1 MB transferred
50 requests
0.44 g CO2 per page load
JavaScript 1.2 MiB 58%
Images 646.1 KiB 30%
Fonts 190.7 KiB 9%
HTML 37.4 KiB 2%
Other 33.0 KiB 2%
CSS 1.4 KiB 0%
Other 1.1 KiB 0%
Other 550 B 0%
0 2.4 MB 4.9 MB
Approaching limit

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

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 (2.1 MiB of 2.1 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
4342ms total JS execution
FIX
4342ms total JS execution
Warning::
https://www.edutopia.org/assets/client.d2c05d5f116...: 1550ms CPU time
Warning::
https://www.edutopia.org/: 769ms CPU time
Warning::
https://www.edutopia.org/assets/react.6a4372d92c88...: 528ms CPU time
Warning::
Unattributable: 518ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RFWV...: 284ms CPU time
Warning::
Third-party scripts: 4342ms (100% of total)

Main Thread Breakdown

Script Evaluation 57% Script Parsing & Compilation 13% Other 12% Style & Layout 11% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.edutopia.org/assets/client.d2c05d5f116b64f55f37.js1550ms1159ms261ms3rd
https://www.edutopia.org/769ms27ms21ms3rd
https://www.edutopia.org/assets/react.6a4372d92c886a45b0f6.js528ms487ms18ms3rd
Unattributable518ms128ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-RFWVENN15N&cx=c&gtm=4e64k0284ms217ms65ms3rd
https://connect.facebook.net/signals/config/1528081978025679?v=2.9.303&r=stable&domain=www.edutopia.org&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C168174ms147ms27ms3rd
https://connect.facebook.net/en_US/fbevents.js173ms125ms46ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5GV9D5CH133ms79ms39ms3rd
https://cdn.parsely.com/keys/edutopia.org/p.js113ms84ms23ms3rd
https://www.googletagmanager.com/gtag/js?id=G-RFWVENN15N99ms33ms66ms3rd
F
JS Bundles
Action
10 scripts, 622 KB unused
FIX
10 scripts, 622 KB unused
Warning::
https://www.edutopia.org/assets/client.d2c05d5f116...: 332 KB unused (58%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RFWV...: 116 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-RFWV...: 71 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5GV...: 70 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 34 KB unused (35%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 622 KB
622 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.edutopia.org/assets/client.d2c05d5f116b64f55f37.js571 KB332 KB (58%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-RFWVENN15N173 KB116 KB (67%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-RFWVENN15N&cx=c&gtm=4e64k0173 KB71 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5GV9D5CH112 KB70 KB (63%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB34 KB (35%)✓3rd
https://www.edutopia.org/assets/react.6a4372d92c886a45b0f6.js44 KB—✓3rd
https://cdn.parsely.com/keys/edutopia.org/p.js19 KB—✓3rd
https://www.edutopia.org/assets/429.bd2bf0a5f2251f3102e8.js9 KB—✓3rd
https://www.edutopia.org/assets/pages-LandingPage-LandingPage.4a4c110d3a26e30217dc.js3 KB—✓3rd
https://connect.facebook.net/signals/config/1528081978025679?v=2.9.303&r=stable&domain=www.edutopia.org&hme=97937018cefade17726f0472876fc101316b2ce9008a35a6a5a7977d7436151a&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C276%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C263%2C264%2C262%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C278%2C293%2C212%2C201%2C202%2C200%2C296%2C288%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16845 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

F
Page Weight Inventory
Action
50 resources · 2.1 MB · 622 KB savings available
FIX
50 resources · 2.1 MB · 622 KB savings available
Warning::
Page weight 1.1 MB over 1MB target
Got: 2.1 MB Expected: ≤ 1 MB
Info::
~622 KB of savings available
Warning::
49 third-party resources (100% of weight)
Info::
1 resources over 200KB
50 resources · 2.1 MiB · 49 third-party 1.1 MiB over 1MB target
JavaScript 58% · 1.2 MiB
Image 31% · 678.7 KiB
Font 9% · 190.7 KiB
Document 2% · 37.4 KiB
Other 0% · 2.0 KiB
CSS 0% · 1.4 KiB

~622.1 KiB of savings available

Remove unused JavaScript: 622.1 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.

B
Image Optimization
22 images, 0 KB saveable
REVIEW
22 images, 0 KB saveable
Info::
All images are well-optimized
22 images 646 KB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
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
9 fonts (191 KB)
PASS
9 fonts (191 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

191 KB total

Render-blocking

0

of 9

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 FCP 3.2 s LCP 12.9 shttps://use.typekit.net/af/ef2129/00000000000000003b9b387c/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/ef2129/00000000000000003b9b387c/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 17.9 KiB — 29 ms — font-display: swaphttps://use.typekit.net/af/403911/00000000000000003b9b3880/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3l https://use.typekit.net/af/403911/00000000000000003b9b3880/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n6&v=3 — 17.8 KiB — 30 ms — font-display: swaphttps://use.typekit.net/af/aa1d64/00000000000000003b9b387a/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3l https://use.typekit.net/af/aa1d64/00000000000000003b9b387a/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n3&v=3 — 17.1 KiB — 31 ms — font-display: swaphttps://use.typekit.net/af/e8450c/00000000000000003b9b387e/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/e8450c/00000000000000003b9b387e/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 17.0 KiB — 34 ms — font-display: swaphttps://www.edutopia.org/assets/fonts/29D59A_0_0.woff29D59A_0_0.woff https://www.edutopia.org/assets/fonts/29D59A_0_0.woff — 36.1 KiB — 20 ms — font-display: swaphttps://use.typekit.net/af/aee0aa/00000000000000003b9b3f03/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/aee0aa/00000000000000003b9b3f03/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 13.6 KiB — 19 ms — font-display: swaphttps://use.typekit.net/af/b67c91/00000000000000003b9b387d/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/b67c91/00000000000000003b9b387d/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 19.3 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/a65f36/00000000000000003b9b4731/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3l https://use.typekit.net/af/a65f36/00000000000000003b9b4731/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i3&v=3 — 15.0 KiB — 6 ms — font-display: swaphttps://www.edutopia.org/assets/fonts/29D59A_1_0.woff29D59A_1_0.woff https://www.edutopia.org/assets/fonts/29D59A_1_0.woff — 36.8 KiB — 13 ms — font-display: swap
l woff2 swap
Size 18 KB
Load time 29 ms
Start 516 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 18 KB
Load time 30 ms
Start 519 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 17 KB
Load time 31 ms
Start 519 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 17 KB
Load time 34 ms
Start 519 ms
Risk FOUT — text flashes from fallback to web font
29D59A_0_0.woff woff swap
Size 36 KB
Load time 20 ms
Start 762 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
l woff2 swap
Size 14 KB
Load time 19 ms
Start 762 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 17 ms
Start 762 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 15 KB
Load time 6 ms
Start 909 ms
Risk FOUT — text flashes from fallback to web font
29D59A_1_0.woff woff swap
Size 37 KB
Load time 13 ms
Start 1.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~22 KB and ~44 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
12 hints, 0 missing preconnects
PASS
12 hints, 0 missing preconnects
Info::
Page uses 12 resource hint(s)

Current Resource Hints

preconnect
5
preload
7
dns-prefetch
—
prefetch
—

12 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
A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
50 requests over 2061ms
INFO
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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 4342ms · 1271KB · €47/mo
www.edutopia.org
Other
Costly
Execution 1550ms
Transfer 571 KB
Unused 58%
Monthly Cost €17/mo
www.edutopia.org
Other
Costly
Execution 769ms
Transfer 37 KB
Monthly Cost €8/mo
www.edutopia.org
Other
Costly
Execution 528ms
Transfer 44 KB
Monthly Cost €6/mo
Unattributable
Other
Costly
Execution 518ms
Transfer 0 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 284ms
Transfer 173 KB
Unused 41%
Monthly Cost €3/mo
Facebook Pixel
Advertising
Optional
Execution 174ms
Transfer 45 KB
Monthly Cost €2/mo
Facebook Pixel
Advertising
Optional
Execution 173ms
Transfer 97 KB
Unused 35%
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 133ms
Transfer 112 KB
Unused 63%
Monthly Cost €1/mo
cdn.parsely.com
Other
Optional
Execution 113ms
Transfer 19 KB
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 99ms
Transfer 173 KB
Unused 67%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.edutopia.org adds 1550ms and costs ~€17/month
  • www.edutopia.org adds 769ms and costs ~€8/month
  • www.edutopia.org adds 528ms and costs ~€6/month
  • Unattributable adds 518ms and costs ~€6/month
  • Google Tag Manager adds 284ms and costs ~€3/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.edutopia.org takes 1550ms 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

58% of www.edutopia.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.edutopia.org takes 769ms 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.edutopia.org takes 528ms 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 518ms 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 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

63% 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

67% 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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