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https://neurology.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
92
GRADE
A
FIX
2
REVIEW
1
PASS
12
INFO
2

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

Mobile Desktop
90
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.
36
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.

978 ms

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

1.93 s

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

396 ms

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

0.004

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

1.02 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.

3.23 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
12 PASS 1 REVIEW 2 FIX
D
Third-Party Impact
Action
82% third-party, 0 ms blocking
FIX
82% third-party, 0 ms blocking
Warning::
Third-party code accounts for 82% of page weight (451.5 KiB of 550.6 KiB)
Info::
Third-party blocking time is low (0 ms)
18%
82%
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.

B
JS Execution Cost
998ms total JS execution
REVIEW
998ms total JS execution
Warning::
https://neurology.org/cdn-cgi/challenge-platform/h...: 791ms CPU time
Info::
Unattributable: 109ms CPU time
Info::
https://neurology.org/: 98ms CPU time
Info::
Third-party scripts: 109ms (11% of total)

Main Thread Breakdown

Script Evaluation 79% Other 14%
ScriptTotalScriptingParse/CompileParty
https://neurology.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07777aa8ed9f03791ms750ms20ms1st
Unattributable109ms4ms0ms3rd
https://neurology.org/98ms36ms2ms1st
A+
Page Weight Budget
551 KB transferred, 21 requests
PASS
551 KB transferred, 21 requests
Info::
Page weighs 978 KB (551 KB transferred)
Info::
21 HTTP requests
Info::
Estimated 0.11 g CO2 per page load
551 KB / 2.4 MB budget
551 KB transferred
21 requests
0.11 g CO2 per page load
Other 331.8 KiB 60%
HTML 101.3 KiB 18%
JavaScript 99.4 KiB 18%
Images 11.5 KiB 2%
Other 5.0 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 11 KB
0 oversized -0 KB
3 legacy format
0 missing dimensions CLS risk
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
9 scripts, 0 KB unused
PASS
9 scripts, 0 KB unused
0 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da177152312451611 KB—✓3rd
https://neurology.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07777aa8ed9f0371 KB—✓1st
blob:https://neurology.org/4f8966d1-73fe-4371-9a14-2fc0c52e42cb0 KB—✓3rd
https://challenges.cloudflare.com/turnstile/v0/b/0b8fb825cb67/api.js?onload=cFRiY3&render=explicit17 KB—✓3rd
blob:https://neurology.org/3199a10b-ca0a-45d6-ac65-45380e4b1429-0 KB—✓3rd
blob:https://challenges.cloudflare.com/775c776d-47f5-437e-b7b1-f6ccd145c91a0 KB—✓3rd
blob:https://challenges.cloudflare.com/9894fc97-cdd4-43de-bf92-fcc84e0c986e-0 KB—✓3rd
blob:https://challenges.cloudflare.com/9894fc97-cdd4-43de-bf92-fcc84e0c986e-0 KB—✓3rd
blob:https://challenges.cloudflare.com/18ffda49-317e-49bf-a12e-3886e823d98e-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
21 resources · 551 KB · 0 KB savings available
PASS
21 resources · 551 KB · 0 KB savings available
Info::
Within 1MB page-weight target
Got: 551 KB
Warning::
14 third-party resources (82% of weight)
Info::
1 resources over 200KB
21 resources · 550.6 KiB · 14 third-party Within 1MB page-weight target
Other 61% · 333.5 KiB
Document 19% · 106.2 KiB
JavaScript 18% · 99.4 KiB
Image 2% · 11.5 KiB
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
21 requests over 2700ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 978 ms LCP 1.9 shttps://neurology.org// https://neurology.org/ — 307 — 63 B — 74 ms — http/1.1https://neurology.org// https://neurology.org/ — 403 — 3.7 KiB — 24 ms — h2https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516static.cloudflareinsights.com/beaco... https://static.cloudflareinsights.com/beacon.min.js/v8c78df7c7c0f484497ecbca7046644da1771523124516 — 200 — 10.7 KiB — 84 ms — h2https://neurology.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07777aa8ed9f03/cdn-cgi/challenge-platform/h/b/orc... https://neurology.org/cdn-cgi/challenge-platform/h/b/orchestrate/chl_page/v1?ray=9f07777aa8ed9f03 — 200 — 71.3 KiB — 68 ms — h3blob:https://neurology.org/4f8966d1-73fe-4371-9a14-2fc0c52e42cbneurology.org/4f8966d1-73fe-4371-9a... blob:https://neurology.org/4f8966d1-73fe-4371-9a14-2fc0c52e42cb — -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 — 87 ms — h2https://neurology.org/favicon.ico/favicon.ico https://neurology.org/favicon.ico — 403 — 5.3 KiB — 26 ms — h3https://neurology.org/cdn-cgi/rum?/cdn-cgi/rum? https://neurology.org/cdn-cgi/rum? — 204 — 209 B — 21 ms — h3https://neurology.org/favicon.ico/favicon.ico https://neurology.org/favicon.ico — 403 — 4.9 KiB — 38 ms — h3https://neurology.org/cdn-cgi/challenge-platform/h/b/flow/ov1/2574961096:1776888745:P4hk-3o_RhsRQQX88q8VNO601T4pZszmFrMeGiReD2Q/9f07777aa8ed9f03/iqct_LOSEKcwO22p_UEHi6MqdbY.W4O7iljOyeTbR1I-1776890669-1.2.1.1-oqPEsTfbDYn2bj9O3vMqUds0k6R_2eilISzg9xV8HWcDac9kfUdBR9.O1efe2lRe/cdn-cgi/challenge-platform/h/b/flo... https://neurology.org/cdn-cgi/challenge-platform/h/b/flow/ov1/2574961096:1776888745:P4hk-3o_RhsRQQX88q8VNO601T4pZszmFrMeGiReD2Q/9f07777aa8ed9f03/iqct_LOSEKcwO22p_UEHi6MqdbY.W4O7iljOyeTbR1I-1776890669-1.2.1.1-oqPEsTfbDYn2bj9O3vMqUds0k6R_2eilISzg9xV8HWcDac9kfUdBR9.O1efe2lRe — 200 — 13.5 KiB — 39 ms — h3blob:https://neurology.org/3199a10b-ca0a-45d6-ac65-45380e4b1429neurology.org/3199a10b-ca0a-45d6-ac... blob:https://neurology.org/3199a10b-ca0a-45d6-ac65-45380e4b1429 — 200 — -1 B — 23 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/turnstile/f/ov2/av0/rch/2zza5/0x4AAAAAAADnPIDROrmt1Wwj/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/2zza5/0x4AAAAAAADnPIDROrmt1Wwj/light/fbE/new/normal?lang=auto — 200 — 97.5 KiB — 101 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 — 29 ms — h3blob:https://challenges.cloudflare.com/775c776d-47f5-437e-b7b1-f6ccd145c91achallenges.cloudflare.com/775c776d-... blob:https://challenges.cloudflare.com/775c776d-47f5-437e-b7b1-f6ccd145c91a — -1 — 0 B — 0 ms — https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/132605135:1776888746:UUgqxRDgmAerTIn1KCwsWYrFICNJQNFuswq5ghIZNvY/9f07777d0cbbd10b/_wUepkWQMN7.vjV6UTXTt6U6jSJkE3jbXsV6ddMdZzg-1776890669-1.2.1.1-RpOnKiEBElbnAeQaXH6rX3vHCV5Fbo5Mh1W0p1cJEtQXZpy0K9nc1Uwgy8WFh2Sgchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/132605135:1776888746:UUgqxRDgmAerTIn1KCwsWYrFICNJQNFuswq5ghIZNvY/9f07777d0cbbd10b/_wUepkWQMN7.vjV6UTXTt6U6jSJkE3jbXsV6ddMdZzg-1776890669-1.2.1.1-RpOnKiEBElbnAeQaXH6rX3vHCV5Fbo5Mh1W0p1cJEtQXZpy0K9nc1Uwgy8WFh2Sg — 200 — 295.2 KiB — 136 ms — h3blob:https://challenges.cloudflare.com/9894fc97-cdd4-43de-bf92-fcc84e0c986echallenges.cloudflare.com/9894fc97-... blob:https://challenges.cloudflare.com/9894fc97-cdd4-43de-bf92-fcc84e0c986e — 200 — -1 B — 66 ms — blobblob:https://challenges.cloudflare.com/9894fc97-cdd4-43de-bf92-fcc84e0c986echallenges.cloudflare.com/9894fc97-... blob:https://challenges.cloudflare.com/9894fc97-cdd4-43de-bf92-fcc84e0c986e — 200 — -1 B — 10 ms — blobhttps://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/pat/9f07777d0cbbd10b/1776890669890/8531033910dc071ff4953bc79efb26e50e70c5c20d87feaa3327f756af024ec4/FMRvnDTGrXXOOIAchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/pat/9f07777d0cbbd10b/1776890669890/8531033910dc071ff4953bc79efb26e50e70c5c20d87feaa3327f756af024ec4/FMRvnDTGrXXOOIA — 401 — 1.7 KiB — 20 ms — h3https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/d/9f07777d0cbbd10b/1776890669891/2KWwvW15OJcif0Qchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/d/9f07777d0cbbd10b/1776890669891/2KWwvW15OJcif0Q — 200 — 6.0 KiB — 21 ms — h3https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/132605135:1776888746:UUgqxRDgmAerTIn1KCwsWYrFICNJQNFuswq5ghIZNvY/9f07777d0cbbd10b/_wUepkWQMN7.vjV6UTXTt6U6jSJkE3jbXsV6ddMdZzg-1776890669-1.2.1.1-RpOnKiEBElbnAeQaXH6rX3vHCV5Fbo5Mh1W0p1cJEtQXZpy0K9nc1Uwgy8WFh2Sgchallenges.cloudflare.com/cdn-cgi/c... https://challenges.cloudflare.com/cdn-cgi/challenge-platform/h/b/flow/ov1/132605135:1776888746:UUgqxRDgmAerTIn1KCwsWYrFICNJQNFuswq5ghIZNvY/9f07777d0cbbd10b/_wUepkWQMN7.vjV6UTXTt6U6jSJkE3jbXsV6ddMdZzg-1776890669-1.2.1.1-RpOnKiEBElbnAeQaXH6rX3vHCV5Fbo5Mh1W0p1cJEtQXZpy0K9nc1Uwgy8WFh2Sg — 200 — 22.8 KiB — 45 ms — h3blob:https://challenges.cloudflare.com/18ffda49-317e-49bf-a12e-3886e823d98echallenges.cloudflare.com/18ffda49-... blob:https://challenges.cloudflare.com/18ffda49-317e-49bf-a12e-3886e823d98e — 200 — -1 B — 12 ms — blob
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
11% of JavaScript execution is third-party
First-party Third-party 109ms · 0KB · $1/mo
Unattributable
Other
Optional
Execution 109ms
Transfer 0 KB
Monthly Cost $1/mo

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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