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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
2
REVIEW
1
PASS
10
INFO
2

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

Mobile Desktop
98
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
90
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.
45
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.

776 ms

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

973 ms

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

4 ms

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

0.001

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

779 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

987 ms

Page Load Progression

377 ms
754 ms
1.1 s
1.5 s
1.9 s
2.3 s
2.6 s
3.0 s
Checks
15
10 PASS 1 REVIEW 2 FIX
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 (505.7 KiB of 506.0 KiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Page Weight Budget
506 KB transferred, 24 requests
PASS
506 KB transferred, 24 requests
Info::
Page weighs 928 KB (506 KB transferred)
Info::
24 HTTP requests
Info::
Estimated 0.10 g CO2 per page load
506 KB / 2.4 MB budget
506 KB transferred
24 requests
0.10 g CO2 per page load
Other 297.1 KiB 59%
HTML 99.7 KiB 20%
JavaScript 90.0 KiB 18%
Images 12.2 KiB 2%
Other 5.3 KiB 1%
Other 1.7 KiB 0%
0 2.4 MB 4.9 MB
Under budget
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
3 images, 0 KB saveable
PASS
3 images, 0 KB saveable
Info::
All images are well-optimized
3 images 12 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
A+
JS Execution Cost
237ms total JS execution
PASS
237ms total JS execution
Info::
https://publications.aap.org/cdn-cgi/challenge-pla...: 237ms CPU time
Warning::
Third-party scripts: 237ms (100% of total)

Main Thread Breakdown

Script Evaluation 77% Other 15%
ScriptTotalScriptingParse/CompileParty
https://publications.aap.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f001a667deecea9237ms224ms4ms3rd
A+
Font Loading
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
A+
JS Bundles
11 scripts, 0 KB unused
PASS
11 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://publications.aap.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f001a667deecea973 KB—✓3rd
blob:https://publications.aap.org/efb11bb5-8b6a-439b-835b-41006796386e0 KB—✓3rd
https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicit17 KB—✓3rd
blob:https://publications.aap.org/169ad513-a8a1-476f-8066-09d909ccddde-0 KB—✓3rd
blob:https://challenges.cloudflare.com/eaa2bacb-e361-43dd-9dc2-faf6af4166270 KB—✓3rd
blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8-0 KB—✓3rd
blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8-0 KB—✓3rd
blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee80 KB—✓3rd
blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8-0 KB—✓3rd
blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8-0 KB—✓3rd
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
A
Page Weight Inventory
24 resources · 506 KB · 0 KB savings available
PASS
24 resources · 506 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 506 KB
Warning::
22 third-party resources (100% of weight)
Info::
1 resources over 200KB
24 resources · 506.0 KiB · 22 third-party Within 1MB page-weight target
Other 59% · 298.8 KiB
Document 21% · 105.0 KiB
JavaScript 18% · 90.0 KiB
Image 2% · 12.2 KiB
Network Waterfall
24 requests over 2804ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 776 ms LCP 973 mshttps://aappublications.org// https://aappublications.org/ — 301 — 398 B — 300 ms — h2https://publications.aap.org/publications.aap.org/ https://publications.aap.org/ — 307 — 69 B — 63 ms — http/1.1https://aappublications.org// https://aappublications.org/ — 301 — 0 B — 1 ms — h2https://publications.aap.org/publications.aap.org/ https://publications.aap.org/ — 403 — 3.9 KiB — 21 ms — h2https://publications.aap.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f001a667deecea9publications.aap.org/cdn-cgi/challe... https://publications.aap.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f001a667deecea9 — 200 — 72.7 KiB — 33 ms — h2blob:https://publications.aap.org/efb11bb5-8b6a-439b-835b-41006796386epublications.aap.org/efb11bb5-8b6a-... blob:https://publications.aap.org/efb11bb5-8b6a-439b-835b-41006796386e — -1 — 0 B — 0 ms — https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicitchallenges.cloudflare.com/turnstile... https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicit — 200 — 17.3 KiB — 150 ms — h2https://publications.aap.org/favicon.icopublications.aap.org/favicon.ico https://publications.aap.org/favicon.ico — 403 — 5.9 KiB — 21 ms — h2https://publications.aap.org/cdn-cgi/challenge-platform/h/b/flow/ov1/3499000528:1776812993:fvsTiSt19tDWhePhcNRo5OEHFi1GoXkVfbP61LZHlDw/9f001a667deecea9/o17QKnIkMGF.f1ilnfihPJfLoB.Ls7yw1MXp4f9D7Kc-1776813456-1.2.1.1-1kI6l3iz6PhrvgqqsS9B63_vOTH0PxcH905jFI6OS3B2qNnf1sq_MGGvh6huPOM2publications.aap.org/cdn-cgi/challe... https://publications.aap.org/cdn-cgi/challenge-platform/h/b/flow/ov1/3499000528:1776812993:fvsTiSt19tDWhePhcNRo5OEHFi1GoXkVfbP61LZHlDw/9f001a667deecea9/o17QKnIkMGF.f1ilnfihPJfLoB.Ls7yw1MXp4f9D7Kc-1776813456-1.2.1.1-1kI6l3iz6PhrvgqqsS9B63_vOTH0PxcH905jFI6OS3B2qNnf1sq_MGGvh6huPOM2 — 200 — 13.9 KiB — 30 ms — h2https://publications.aap.org/favicon.icopublications.aap.org/favicon.ico https://publications.aap.org/favicon.ico — 403 — 4.9 KiB — 21 ms — h2blob:https://publications.aap.org/169ad513-a8a1-476f-8066-09d909ccdddepublications.aap.org/169ad513-a8a1-... blob:https://publications.aap.org/169ad513-a8a1-476f-8066-09d909ccddde — 200 — -1 B — 23 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/turnstile/f/ov2/av0/rch/sof52/0x4AAAAAAADnPIDROrmt1Wwj/light/fbE/new/normal?lang=autochallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/turnstile/f/ov2/av0/rch/sof52/0x4AAAAAAADnPIDROrmt1Wwj/light/fbE/new/normal?lang=auto — 200 — 95.8 KiB — 102 ms — h3https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/1challenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/cmg/1 — 200 — 208 B — 21 ms — h3blob:https://challenges.cloudflare.com/eaa2bacb-e361-43dd-9dc2-faf6af416627challenges.cloudflare.com/eaa2bacb-... blob:https://challenges.cloudflare.com/eaa2bacb-e361-43dd-9dc2-faf6af416627 — -1 — 0 B — 0 ms — https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/2431635084:1776812995:-4DE9CYO4IcAVX1gqKxpBQ13Iyx-3skO0IHEUQsE6Qs/9f001a68a82d6fb8/DCljv2geyWUtgCmVBTJWYesemRfmxxWw61G671tkTS8-1776813456-1.2.1.1-Em2AE91VONdXY9rWYC7Boezmy2ivJyj.wavV8HxEy9hyGCN_tUA19P5LVbpKc1Puchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/2431635084:1776812995:-4DE9CYO4IcAVX1gqKxpBQ13Iyx-3skO0IHEUQsE6Qs/9f001a68a82d6fb8/DCljv2geyWUtgCmVBTJWYesemRfmxxWw61G671tkTS8-1776813456-1.2.1.1-Em2AE91VONdXY9rWYC7Boezmy2ivJyj.wavV8HxEy9hyGCN_tUA19P5LVbpKc1Pu — 200 — 260.5 KiB — 152 ms — h3blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8challenges.cloudflare.com/c6dc18c2-... blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8 — 200 — -1 B — 14 ms — blobblob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8challenges.cloudflare.com/c6dc18c2-... blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8 — 200 — -1 B — 13 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/d/9f001a68a82d6fb8/1776813457053/olT95g2F3ACyJJgchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/d/9f001a68a82d6fb8/1776813457053/olT95g2F3ACyJJg — 200 — 6.1 KiB — 21 ms — h3https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/pat/9f001a68a82d6fb8/1776813457054/ff50d2d7e6f2cc7d3a0f0f44374f920452c543275f22ac73bc53362db3eecd14/dgVCL2x9Qb4W9_lchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/pat/9f001a68a82d6fb8/1776813457054/ff50d2d7e6f2cc7d3a0f0f44374f920452c543275f22ac73bc53362db3eecd14/dgVCL2x9Qb4W9_l — 401 — 1.7 KiB — 21 ms — h3blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8challenges.cloudflare.com/c6dc18c2-... blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8 — -1 — 0 B — 0 ms — blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8challenges.cloudflare.com/c6dc18c2-... blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8 — 200 — -1 B — 11 ms — blobblob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8challenges.cloudflare.com/c6dc18c2-... blob:https://challenges.cloudflare.com/c6dc18c2-93b8-466f-9fcf-b1a3b18c5ee8 — 200 — -1 B — 11 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/2431635084:1776812995:-4DE9CYO4IcAVX1gqKxpBQ13Iyx-3skO0IHEUQsE6Qs/9f001a68a82d6fb8/DCljv2geyWUtgCmVBTJWYesemRfmxxWw61G671tkTS8-1776813456-1.2.1.1-Em2AE91VONdXY9rWYC7Boezmy2ivJyj.wavV8HxEy9hyGCN_tUA19P5LVbpKc1Puchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/2431635084:1776812995:-4DE9CYO4IcAVX1gqKxpBQ13Iyx-3skO0IHEUQsE6Qs/9f001a68a82d6fb8/DCljv2geyWUtgCmVBTJWYesemRfmxxWw61G671tkTS8-1776813456-1.2.1.1-Em2AE91VONdXY9rWYC7Boezmy2ivJyj.wavV8HxEy9hyGCN_tUA19P5LVbpKc1Pu — 200 — 22.8 KiB — 49 ms — h3blob:https://challenges.cloudflare.com/274d853d-d8e2-45c7-b504-5a62654d0b16challenges.cloudflare.com/274d853d-... 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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 237ms · 73KB · $3/mo
publications.aap.org
Other
Costly
Execution 237ms
Transfer 73 KB
Monthly Cost $3/mo

These scripts may cost more than they're worth

  • publications.aap.org adds 237ms 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

publications.aap.org takes 237ms 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

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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