Skip to content
https://clinicaltrials.gov

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
79
GRADE
C
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
42
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
97
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.
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.

2.76 s

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

9.26 s

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

1.38 s

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

0.035

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

4.86 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.

11.43 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 4 REVIEW 3 FIX
F
JS Execution Cost
Action
4836ms total JS execution
FIX
4836ms total JS execution
Warning::
https://clinicaltrials.gov/polyfills-6ISPNSXF.js: 1659ms CPU time
Warning::
Unattributable: 926ms CPU time
Warning::
https://clinicaltrials.gov/: 477ms CPU time
Warning::
https://clinicaltrials.gov/chunk-PVALZXTS.js: 384ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 295ms CPU time
Info::
Third-party scripts: 2081ms (43% of total)

Main Thread Breakdown

Script Evaluation 58% Other 19% Style & Layout 8% Parse HTML & CSS 5% Script Parsing & Compilation 5%
ScriptTotalScriptingParse/CompileParty
https://clinicaltrials.gov/polyfills-6ISPNSXF.js1659ms1373ms0ms1st
Unattributable926ms143ms0ms3rd
https://clinicaltrials.gov/477ms8ms1ms1st
https://clinicaltrials.gov/chunk-PVALZXTS.js384ms371ms0ms1st
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L295ms241ms51ms3rd
https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1293ms234ms55ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer257ms195ms50ms3rd
https://clinicaltrials.gov/scripts-2KLTL4Y7.js174ms87ms13ms1st
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.gov118ms85ms17ms3rd
https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.js105ms61ms15ms3rd

Showing top 10 of 12 scripts

D
Page Weight Inventory
Action
98 resources · 1.4 MB · 261 KB savings available
FIX
98 resources · 1.4 MB · 261 KB savings available
Warning::
Page weight 385 KB over 1MB target
Got: 1.4 MB Expected: ≤ 1 MB
Info::
~261 KB of savings available
Warning::
30 third-party resources (46% of weight)
Info::
1 resources over 200KB
98 resources · 1.4 MiB · 30 third-party 384.6 KiB over 1MB target
JavaScript 68% · 954.2 KiB
Image 20% · 285.2 KiB
CSS 7% · 100.0 KiB
Font 3% · 42.2 KiB
Document 1% · 15.2 KiB
Other 1% · 11.8 KiB

~261.4 KiB of savings available

Remove unused JavaScript: 261.4 KiB
D
HTTP Caching
Action
no-store (uncacheable)
FIX
no-store (uncacheable)
Info::
Cache-Control: no-store prevents all caching
Intentional for dynamic content, but increases server load for every page view.
Got: no-cache,no-store, max-age=0, must-revalidate
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

no-cache,no-store, max-age=0, must-revalidate

DirectiveValueMeaning
no-cache—Cache but always revalidate first
no-store—Never cache this response
max-age0Cache for 0 seconds
must-revalidate—Must recheck with server after expiry
B
Page Weight Budget
1.4 MB transferred, 98 requests
REVIEW
1.4 MB transferred, 98 requests
Info::
Page weighs 4.3 MB (1.4 MB transferred)
Warning::
JavaScript is 954 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 954 KB
Info::
98 HTTP requests
Info::
Estimated 0.29 g CO2 per page load
1.4 MB / 2.4 MB budget
1.4 MB transferred
98 requests
0.29 g CO2 per page load
JavaScript 954.2 KiB 68%
Images 252.1 KiB 18%
CSS 100.0 KiB 7%
Fonts 42.2 KiB 3%
Other 33.8 KiB 2%
HTML 14.6 KiB 1%
Other 11.1 KiB 1%
Other 687 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Under 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

B
Third-Party Impact
46% third-party, 0 ms blocking
REVIEW
46% third-party, 0 ms blocking
Info::
Third-party code accounts for 46% of page weight (648.4 KiB of 1.4 MiB)
Info::
Third-party blocking time is low (0 ms)
54%
46%
First-party Third-party
C
Image Optimization
Action
18 images, 0 KB saveable
REVIEW
18 images, 0 KB saveable
Warning::
https://clinicaltrials.gov/assets/uswds/img/us_fla... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://clinicaltrials.gov/assets/main/img/AgencyL... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://clinicaltrials.gov/assets/images/ctg-foote... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://clinicaltrials.gov/assets/images/ctg-heade... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://iad1.qualtrics.com/WRQualtricsSiteIntercep... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
18 images 252 KB
0 oversized -0 KB
17 legacy format
5 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
48 scripts, 261 KB unused
REVIEW
48 scripts, 261 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-DP2X...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-PC9...: 60 KB unused (47%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://clinicaltrials.gov/chunk-FOI7A4D4.js: 29 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://clinicaltrials.gov/chunk-J3DBZWUT.js: 26 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 261 KB
261 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1148 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB62 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer130 KB60 KB (47%)✓3rd
https://clinicaltrials.gov/chunk-FOI7A4D4.js54 KB29 KB (54%)✓1st
https://clinicaltrials.gov/chunk-J3DBZWUT.js70 KB26 KB (36%)✓1st
https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.gov36 KB21 KB (60%)✓3rd
https://clinicaltrials.gov/main-CVYC5WO6.js29 KB—✓1st
https://clinicaltrials.gov/chunk-ELQWUAPR.js6 KB—✓1st
https://clinicaltrials.gov/chunk-CET22XHF.js2 KB—✓1st
https://clinicaltrials.gov/chunk-ZTDDVPAW.js2 KB—✓1st

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

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 (42 KB)
PASS
1 fonts (42 KB)
Info::
1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

1

42 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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.8 s LCP 9.3 shttps://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 42.2 KiB — 40 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 42 KB
Load time 40 ms
Start 187 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
1 hints, 0 missing preconnects
PASS
1 hints, 0 missing preconnects
Info::
Page uses 1 resource hint(s)

Current Resource Hints

preconnect
1
preload
—
dns-prefetch
—
prefetch
—

1 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: Google Cloud

Network Waterfall
98 requests over 2389ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.8 s LCP 9.3 shttps://clinicaltrials.gov// https://clinicaltrials.gov/ — 200 — 14.6 KiB — 145 ms — h2https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.jscdn.ncbi.nlm.nih.gov/core/pinger/pi... https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.js — 200 — 29.7 KiB — 34 ms — h2https://clinicaltrials.gov/chunk-CSFWWYAD.js/chunk-CSFWWYAD.js https://clinicaltrials.gov/chunk-CSFWWYAD.js — 200 — 1.8 KiB — 140 ms — h2https://clinicaltrials.gov/chunk-4RLMJJU6.js/chunk-4RLMJJU6.js https://clinicaltrials.gov/chunk-4RLMJJU6.js — 200 — 3.4 KiB — 142 ms — h2https://clinicaltrials.gov/chunk-A4TKQV37.js/chunk-A4TKQV37.js https://clinicaltrials.gov/chunk-A4TKQV37.js — 200 — 19.4 KiB — 146 ms — h2https://clinicaltrials.gov/chunk-PQ7UAPLD.js/chunk-PQ7UAPLD.js https://clinicaltrials.gov/chunk-PQ7UAPLD.js — 200 — 25.3 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-6K3D2Y6T.js/chunk-6K3D2Y6T.js https://clinicaltrials.gov/chunk-6K3D2Y6T.js — 200 — 3.9 KiB — 139 ms — h2https://clinicaltrials.gov/chunk-IIYQDVVA.js/chunk-IIYQDVVA.js https://clinicaltrials.gov/chunk-IIYQDVVA.js — 200 — 15.0 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-KX25CUXS.js/chunk-KX25CUXS.js https://clinicaltrials.gov/chunk-KX25CUXS.js — 200 — 1.2 KiB — 145 ms — h2https://clinicaltrials.gov/chunk-CET22XHF.js/chunk-CET22XHF.js https://clinicaltrials.gov/chunk-CET22XHF.js — 200 — 1.7 KiB — 148 ms — h2https://clinicaltrials.gov/chunk-ZTDDVPAW.js/chunk-ZTDDVPAW.js https://clinicaltrials.gov/chunk-ZTDDVPAW.js — 200 — 2.4 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-EQYVI5PP.js/chunk-EQYVI5PP.js https://clinicaltrials.gov/chunk-EQYVI5PP.js — 200 — 1.4 KiB — 149 ms — h2https://clinicaltrials.gov/polyfills-6ISPNSXF.js/polyfills-6ISPNSXF.js https://clinicaltrials.gov/polyfills-6ISPNSXF.js — 200 — 12.5 KiB — 151 ms — h2https://clinicaltrials.gov/main-CVYC5WO6.js/main-CVYC5WO6.js https://clinicaltrials.gov/main-CVYC5WO6.js — 200 — 29.3 KiB — 168 ms — h2https://clinicaltrials.gov/scripts-2KLTL4Y7.js/scripts-2KLTL4Y7.js https://clinicaltrials.gov/scripts-2KLTL4Y7.js — 200 — 28.8 KiB — 164 ms — h2https://clinicaltrials.gov/styles-K5ERNWXN.css/styles-K5ERNWXN.css https://clinicaltrials.gov/styles-K5ERNWXN.css — 200 — 100.0 KiB — 172 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg/assets/images/glossary-panel/open-... https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg — 200 — 4.6 KiB — 154 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg/assets/images/glossary-panel/gloss... https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg — 200 — 783 B — 152 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg/assets/images/glossary-panel/close... https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg — 200 — 4.6 KiB — 155 ms — h2https://clinicaltrials.gov/assets/uswds/img/sprite.svg/assets/uswds/img/sprite.svg https://clinicaltrials.gov/assets/uswds/img/sprite.svg — 200 — 22.1 KiB — 165 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg/assets/images/glossary-panel/gloss... https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg — 200 — 0 B — 167 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/search.svg/assets/uswds/img/usa-icons/search.... https://clinicaltrials.gov/assets/uswds/img/usa-icons/search.svg — 200 — 300 B — 155 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 200 — 42.2 KiB — 40 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayerwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer — 200 — 129.9 KiB — 285 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/add.svg/assets/uswds/img/usa-icons/add.svg https://clinicaltrials.gov/assets/uswds/img/usa-icons/add.svg — 200 — 219 B — 127 ms — h2https://clinicaltrials.gov/chunk-KN7AZEOJ.js/chunk-KN7AZEOJ.js https://clinicaltrials.gov/chunk-KN7AZEOJ.js — 200 — 4.3 KiB — 127 ms — h2https://clinicaltrials.gov/chunk-PW3IYSAL.js/chunk-PW3IYSAL.js https://clinicaltrials.gov/chunk-PW3IYSAL.js — 200 — 1.0 KiB — 133 ms — h2https://clinicaltrials.gov/chunk-7Z3OISSX.js/chunk-7Z3OISSX.js https://clinicaltrials.gov/chunk-7Z3OISSX.js — 200 — 990 B — 135 ms — h2https://clinicaltrials.gov/chunk-PVALZXTS.js/chunk-PVALZXTS.js https://clinicaltrials.gov/chunk-PVALZXTS.js — 200 — 5.0 KiB — 140 ms — h2https://clinicaltrials.gov/chunk-3DDGAPOV.js/chunk-3DDGAPOV.js https://clinicaltrials.gov/chunk-3DDGAPOV.js — 200 — 1.1 KiB — 143 ms — h2
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s 8.0 s 9.0 s FCP 2.8 s LCP 9.3 shttps://clinicaltrials.gov// https://clinicaltrials.gov/ — 200 — 14.6 KiB — 145 ms — h2https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.jscdn.ncbi.nlm.nih.gov/core/pinger/pi... https://cdn.ncbi.nlm.nih.gov/core/pinger/pinger.js — 200 — 29.7 KiB — 34 ms — h2https://clinicaltrials.gov/chunk-CSFWWYAD.js/chunk-CSFWWYAD.js https://clinicaltrials.gov/chunk-CSFWWYAD.js — 200 — 1.8 KiB — 140 ms — h2https://clinicaltrials.gov/chunk-4RLMJJU6.js/chunk-4RLMJJU6.js https://clinicaltrials.gov/chunk-4RLMJJU6.js — 200 — 3.4 KiB — 142 ms — h2https://clinicaltrials.gov/chunk-A4TKQV37.js/chunk-A4TKQV37.js https://clinicaltrials.gov/chunk-A4TKQV37.js — 200 — 19.4 KiB — 146 ms — h2https://clinicaltrials.gov/chunk-PQ7UAPLD.js/chunk-PQ7UAPLD.js https://clinicaltrials.gov/chunk-PQ7UAPLD.js — 200 — 25.3 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-6K3D2Y6T.js/chunk-6K3D2Y6T.js https://clinicaltrials.gov/chunk-6K3D2Y6T.js — 200 — 3.9 KiB — 139 ms — h2https://clinicaltrials.gov/chunk-IIYQDVVA.js/chunk-IIYQDVVA.js https://clinicaltrials.gov/chunk-IIYQDVVA.js — 200 — 15.0 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-KX25CUXS.js/chunk-KX25CUXS.js https://clinicaltrials.gov/chunk-KX25CUXS.js — 200 — 1.2 KiB — 145 ms — h2https://clinicaltrials.gov/chunk-CET22XHF.js/chunk-CET22XHF.js https://clinicaltrials.gov/chunk-CET22XHF.js — 200 — 1.7 KiB — 148 ms — h2https://clinicaltrials.gov/chunk-ZTDDVPAW.js/chunk-ZTDDVPAW.js https://clinicaltrials.gov/chunk-ZTDDVPAW.js — 200 — 2.4 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-EQYVI5PP.js/chunk-EQYVI5PP.js https://clinicaltrials.gov/chunk-EQYVI5PP.js — 200 — 1.4 KiB — 149 ms — h2https://clinicaltrials.gov/polyfills-6ISPNSXF.js/polyfills-6ISPNSXF.js https://clinicaltrials.gov/polyfills-6ISPNSXF.js — 200 — 12.5 KiB — 151 ms — h2https://clinicaltrials.gov/main-CVYC5WO6.js/main-CVYC5WO6.js https://clinicaltrials.gov/main-CVYC5WO6.js — 200 — 29.3 KiB — 168 ms — h2https://clinicaltrials.gov/scripts-2KLTL4Y7.js/scripts-2KLTL4Y7.js https://clinicaltrials.gov/scripts-2KLTL4Y7.js — 200 — 28.8 KiB — 164 ms — h2https://clinicaltrials.gov/styles-K5ERNWXN.css/styles-K5ERNWXN.css https://clinicaltrials.gov/styles-K5ERNWXN.css — 200 — 100.0 KiB — 172 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg/assets/images/glossary-panel/open-... https://clinicaltrials.gov/assets/images/glossary-panel/open-glossary-drawer.svg — 200 — 4.6 KiB — 154 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg/assets/images/glossary-panel/gloss... https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg — 200 — 783 B — 152 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg/assets/images/glossary-panel/close... https://clinicaltrials.gov/assets/images/glossary-panel/close-glossary-drawer.svg — 200 — 4.6 KiB — 155 ms — h2https://clinicaltrials.gov/assets/uswds/img/sprite.svg/assets/uswds/img/sprite.svg https://clinicaltrials.gov/assets/uswds/img/sprite.svg — 200 — 22.1 KiB — 165 ms — h2https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg/assets/images/glossary-panel/gloss... https://clinicaltrials.gov/assets/images/glossary-panel/glossary-icon.svg — 200 — 0 B — 167 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/search.svg/assets/uswds/img/usa-icons/search.... https://clinicaltrials.gov/assets/uswds/img/usa-icons/search.svg — 200 — 300 B — 155 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBA.woff2 — 200 — 42.2 KiB — 40 ms — h3https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayerwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-PC9B6M3&l=pingerDataLayer — 200 — 129.9 KiB — 285 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/add.svg/assets/uswds/img/usa-icons/add.svg https://clinicaltrials.gov/assets/uswds/img/usa-icons/add.svg — 200 — 219 B — 127 ms — h2https://clinicaltrials.gov/chunk-KN7AZEOJ.js/chunk-KN7AZEOJ.js https://clinicaltrials.gov/chunk-KN7AZEOJ.js — 200 — 4.3 KiB — 127 ms — h2https://clinicaltrials.gov/chunk-PW3IYSAL.js/chunk-PW3IYSAL.js https://clinicaltrials.gov/chunk-PW3IYSAL.js — 200 — 1.0 KiB — 133 ms — h2https://clinicaltrials.gov/chunk-7Z3OISSX.js/chunk-7Z3OISSX.js https://clinicaltrials.gov/chunk-7Z3OISSX.js — 200 — 990 B — 135 ms — h2https://clinicaltrials.gov/chunk-PVALZXTS.js/chunk-PVALZXTS.js https://clinicaltrials.gov/chunk-PVALZXTS.js — 200 — 5.0 KiB — 140 ms — h2https://clinicaltrials.gov/chunk-3DDGAPOV.js/chunk-3DDGAPOV.js https://clinicaltrials.gov/chunk-3DDGAPOV.js — 200 — 1.1 KiB — 143 ms — h2https://clinicaltrials.gov/chunk-GFFU46TR.js/chunk-GFFU46TR.js https://clinicaltrials.gov/chunk-GFFU46TR.js — 200 — 1.3 KiB — 138 ms — h2https://clinicaltrials.gov/chunk-ASYSXKGO.js/chunk-ASYSXKGO.js https://clinicaltrials.gov/chunk-ASYSXKGO.js — 200 — 2.7 KiB — 136 ms — h2https://clinicaltrials.gov/chunk-AJBU4JFS.js/chunk-AJBU4JFS.js https://clinicaltrials.gov/chunk-AJBU4JFS.js — 200 — 1.2 KiB — 148 ms — h2https://clinicaltrials.gov/chunk-IXB22PCR.js/chunk-IXB22PCR.js https://clinicaltrials.gov/chunk-IXB22PCR.js — 200 — 436 B — 144 ms — h2https://clinicaltrials.gov/chunk-7HZVH4FN.js/chunk-7HZVH4FN.js https://clinicaltrials.gov/chunk-7HZVH4FN.js — 200 — 1.0 KiB — 140 ms — h2https://clinicaltrials.gov/chunk-K3AELK5D.js/chunk-K3AELK5D.js https://clinicaltrials.gov/chunk-K3AELK5D.js — 200 — 1.8 KiB — 145 ms — h2https://clinicaltrials.gov/chunk-AMGYH4SP.js/chunk-AMGYH4SP.js https://clinicaltrials.gov/chunk-AMGYH4SP.js — 200 — 7.2 KiB — 148 ms — h2https://clinicaltrials.gov/chunk-ELQWUAPR.js/chunk-ELQWUAPR.js https://clinicaltrials.gov/chunk-ELQWUAPR.js — 200 — 6.2 KiB — 154 ms — h2https://clinicaltrials.gov/chunk-FOI7A4D4.js/chunk-FOI7A4D4.js https://clinicaltrials.gov/chunk-FOI7A4D4.js — 200 — 54.4 KiB — 176 ms — h2https://clinicaltrials.gov/chunk-XFADYKSL.js/chunk-XFADYKSL.js https://clinicaltrials.gov/chunk-XFADYKSL.js — 200 — 842 B — 156 ms — h2https://clinicaltrials.gov/chunk-O5R2NEDA.js/chunk-O5R2NEDA.js https://clinicaltrials.gov/chunk-O5R2NEDA.js — 200 — 241 B — 161 ms — h2https://clinicaltrials.gov/chunk-DADOP32D.js/chunk-DADOP32D.js https://clinicaltrials.gov/chunk-DADOP32D.js — 200 — 613 B — 163 ms — h2https://clinicaltrials.gov/chunk-WQ2YK7CM.js/chunk-WQ2YK7CM.js https://clinicaltrials.gov/chunk-WQ2YK7CM.js — 200 — 5.4 KiB — 157 ms — h2https://clinicaltrials.gov/chunk-F5OUZD2J.js/chunk-F5OUZD2J.js https://clinicaltrials.gov/chunk-F5OUZD2J.js — 200 — 2.3 KiB — 165 ms — h2https://clinicaltrials.gov/chunk-NZ4U5M7W.js/chunk-NZ4U5M7W.js https://clinicaltrials.gov/chunk-NZ4U5M7W.js — 200 — 47.6 KiB — 176 ms — h2https://clinicaltrials.gov/chunk-J3DBZWUT.js/chunk-J3DBZWUT.js https://clinicaltrials.gov/chunk-J3DBZWUT.js — 200 — 70.5 KiB — 175 ms — h2https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-DP2X732JSX&l=pingerDataLayer&cx=c&gtm=4e64h1 — 200 — 147.6 KiB — 207 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NCBI%20-%20ncbi.nlm.nih.gov&sitetopic=NCBI%20Pinger%200.39.3&siteplatform=NCBI%20Pinger%200.39.3dap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=HHS&subagency=NCBI%20-%20ncbi.nlm.nih.gov&sitetopic=NCBI%20Pinger%200.39.3&siteplatform=NCBI%20Pinger%200.39.3 — 200 — 9.4 KiB — 26 ms — h3https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.jsdap.digitalgov.gov/web-vitals/dist/... https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js — 200 — 4.5 KiB — 48 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.2 KiB — 222 ms — h2https://www.ncbi.nlm.nih.gov/stat?HTTP_REFERER=&SELF_URL=https%3A%2F%2Fclinicaltrials.gov%2F&browserheight=823&browserwidth=412&colorDepth=24&connection_effectivetype=4g&connection_type=&cookieSize=43&cookieenabled=true&is_browser_supported=true&jsevent=render&jsloadtime=48&jsperf_basePage=2&jsperf_connect=11&jsperf_dns=4&jsperf_navTimingNetworkMS=148&jsperf_navTimingRedirectCount=0&jsperf_navTimingType=navigate&jsperf_navType=0&jsperf_redirectCount=0&jsperf_ttfb=128&jsrendertime=630&language_code=en-US&myncbi_signed_in=false&ncbi_algorithm=&ncbi_app=ctgov2&ncbi_app_version=v3.5.2&ncbi_db=&ncbi_featured_srcdb=&ncbi_nwds=&ncbi_pcid=&ncbi_pdid=home&ncbi_phid=54bc9beba1f35cd91776801222666SID&ncbi_program=&ncbi_sid=54bc9beba1f35cd7b12b1222096_7SID&ncbi_timesinceload=582&ncbi_timesincenavstart=794&pagename=ctgov2%3A%3Ahome%3ANONE&pinger_in_iframe=false&screenavailheight=823&screenavailwidth=412&screenheight=823&screenwidth=412&server=clinicaltrials.gov&sgSource=native&sgversion=0.42.0&sgversion_hotfix=0&sgversion_major=0&sgversion_minor=42&spa_index=1www.ncbi.nlm.nih.gov/stat?HTTP_REFE... https://www.ncbi.nlm.nih.gov/stat?HTTP_REFERER=&SELF_URL=https%3A%2F%2Fclinicaltrials.gov%2F&browserheight=823&browserwidth=412&colorDepth=24&connection_effectivetype=4g&connection_type=&cookieSize=43&cookieenabled=true&is_browser_supported=true&jsevent=render&jsloadtime=48&jsperf_basePage=2&jsperf_connect=11&jsperf_dns=4&jsperf_navTimingNetworkMS=148&jsperf_navTimingRedirectCount=0&jsperf_navTimingType=navigate&jsperf_navType=0&jsperf_redirectCount=0&jsperf_ttfb=128&jsrendertime=630&language_code=en-US&myncbi_signed_in=false&ncbi_algorithm=&ncbi_app=ctgov2&ncbi_app_version=v3.5.2&ncbi_db=&ncbi_featured_srcdb=&ncbi_nwds=&ncbi_pcid=&ncbi_pdid=home&ncbi_phid=54bc9beba1f35cd91776801222666SID&ncbi_program=&ncbi_sid=54bc9beba1f35cd7b12b1222096_7SID&ncbi_timesinceload=582&ncbi_timesincenavstart=794&pagename=ctgov2%3A%3Ahome%3ANONE&pinger_in_iframe=false&screenavailheight=823&screenavailwidth=412&screenheight=823&screenwidth=412&server=clinicaltrials.gov&sgSource=native&sgversion=0.42.0&sgversion_hotfix=0&sgversion_major=0&sgversion_minor=42&spa_index=1 — 200 — 79 B — 373 ms — h2https://www.ncbi.nlm.nih.gov/stat?browserheight=823&browserwidth=412&colorDepth=24&connection_effectivetype=4g&connection_type=&cookieSize=141&cookieenabled=true&is_browser_supported=true&jsevent=domready&language_code=en-US&myncbi_signed_in=false&ncbi_algorithm=&ncbi_app=ctgov2&ncbi_app_version=v3.5.2&ncbi_db=&ncbi_featured_srcdb=&ncbi_nwds=&ncbi_pcid=&ncbi_pdid=home&ncbi_phid=54bc9beba1f35cd91776801222666SID&ncbi_program=&ncbi_sid=54bc9beba1f35cd7b12b1222096_7SID&ncbi_timesinceload=599&ncbi_timesincenavstart=811&pagename=ctgov2%3A%3Ahome%3ANONE&pinger_in_iframe=false&screenavailheight=823&screenavailwidth=412&screenheight=823&screenwidth=412&server=clinicaltrials.gov&sgSource=native&sgversion=0.42.0&sgversion_hotfix=0&sgversion_major=0&sgversion_minor=42&spa_index=1www.ncbi.nlm.nih.gov/stat?browserhe... https://www.ncbi.nlm.nih.gov/stat?browserheight=823&browserwidth=412&colorDepth=24&connection_effectivetype=4g&connection_type=&cookieSize=141&cookieenabled=true&is_browser_supported=true&jsevent=domready&language_code=en-US&myncbi_signed_in=false&ncbi_algorithm=&ncbi_app=ctgov2&ncbi_app_version=v3.5.2&ncbi_db=&ncbi_featured_srcdb=&ncbi_nwds=&ncbi_pcid=&ncbi_pdid=home&ncbi_phid=54bc9beba1f35cd91776801222666SID&ncbi_program=&ncbi_sid=54bc9beba1f35cd7b12b1222096_7SID&ncbi_timesinceload=599&ncbi_timesincenavstart=811&pagename=ctgov2%3A%3Ahome%3ANONE&pinger_in_iframe=false&screenavailheight=823&screenavailwidth=412&screenheight=823&screenwidth=412&server=clinicaltrials.gov&sgSource=native&sgversion=0.42.0&sgversion_hotfix=0&sgversion_major=0&sgversion_minor=42&spa_index=1 — 200 — 398 B — 369 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-DP2X732JSX&gtm=45je64h1v884263385z8847342615za20gzb847342615zd847342615&_p=1776801222098&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=603883880.1776801223&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~118128923&dl=https%3A%2F%2Fclinicaltrials.gov%2F&sid=1776801222&sct=1&seg=0&dt=ClinicalTrials.gov&en=page_view&_fv=1&_nsi=1&_ss=1&ep.ncbi_app=ctgov2&ep.ncbi_db=(not%20set)&ep.ncbi_pdid=home&ep.ncbi_signed_in=NO&ep.ncbi_app_db_pdid=ctgov2%3A(not%20set)%3Ahome&ep.debug_event=&ep.content_group=ctgov2%3A(not%20set)%3Ahome&ep.content_group2=ctgov2&ep.content_group3=(not%20set)&ep.content_group4=home&ep.ncbi_pcid=(not%20set)&tfd=900www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-DP2X732JSX&gtm=45je64h1v884263385z8847342615za20gzb847342615zd847342615&_p=1776801222098&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=603883880.1776801223&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266400~118128923&dl=https%3A%2F%2Fclinicaltrials.gov%2F&sid=1776801222&sct=1&seg=0&dt=ClinicalTrials.gov&en=page_view&_fv=1&_nsi=1&_ss=1&ep.ncbi_app=ctgov2&ep.ncbi_db=(not%20set)&ep.ncbi_pdid=home&ep.ncbi_signed_in=NO&ep.ncbi_app_db_pdid=ctgov2%3A(not%20set)%3Ahome&ep.debug_event=&ep.content_group=ctgov2%3A(not%20set)%3Ahome&ep.content_group2=ctgov2&ep.content_group3=(not%20set)&ep.content_group4=home&ep.ncbi_pcid=(not%20set)&tfd=900 — 204 — 551 B — 121 ms — h2https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776801222486&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=603883880.1776801223&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400&dl=https%3A%2F%2Fclinicaltrials.gov%2F&dt=ClinicalTrials.gov&dr=&sid=1776801222&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=NCBI%20-%20NCBI.NLM.NIH.GOV&ep.site_topic=ncbi%20pinger%200.39.3&ep.site_platform=ncbi%20pinger%200.39.3&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=clinicaltrials.gov&tfd=969www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zd9131934939&_p=1776801222486&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=603883880.1776801223&frm=0&pscdl=noapi&rcb=16&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938468~117266400&dl=https%3A%2F%2Fclinicaltrials.gov%2F&dt=ClinicalTrials.gov&dr=&sid=1776801222&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=HHS&ep.subagency=NCBI%20-%20NCBI.NLM.NIH.GOV&ep.site_topic=ncbi%20pinger%200.39.3&ep.site_platform=ncbi%20pinger%200.39.3&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=clinicaltrials.gov&tfd=969 — 204 — 48 B — 66 ms — h2https://zndikywqsjiuwn0q5-nlmenterprise.siteintercept.qualtrics.com/SIE/?Q_ZID=ZN_dikYWqsjiUWN0Q5zndikywqsjiuwn0q5-nlmenterprise.sit... https://zndikywqsjiuwn0q5-nlmenterprise.siteintercept.qualtrics.com/SIE/?Q_ZID=ZN_dikYWqsjiUWN0Q5 — 200 — 4.6 KiB — 39 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/expand_more.svg/assets/uswds/img/usa-icons/expand_... https://clinicaltrials.gov/assets/uswds/img/usa-icons/expand_more.svg — 200 — 231 B — 128 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition — 200 — 350 B — 132 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition — 200 — 167 B — 260 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=InterventionName/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=InterventionName — 200 — 273 B — 131 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName — 200 — 264 B — 134 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName — 200 — 168 B — 258 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LocationFacility/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LocationFacility — 200 — 263 B — 130 ms — h2https://cdn.ncbi.nlm.nih.gov/core/alerts/alerts.jscdn.ncbi.nlm.nih.gov/core/alerts/al... https://cdn.ncbi.nlm.nih.gov/core/alerts/alerts.js — 200 — 6.1 KiB — 8 ms — h2https://clinicaltrials.gov/assets/uswds/img/us_flag_small.png/assets/uswds/img/us_flag_small.png https://clinicaltrials.gov/assets/uswds/img/us_flag_small.png — 200 — 360 B — 132 ms — h2https://clinicaltrials.gov/assets/uswds/img/icon-dot-gov.svg/assets/uswds/img/icon-dot-gov.svg https://clinicaltrials.gov/assets/uswds/img/icon-dot-gov.svg — 200 — 455 B — 140 ms — h2https://clinicaltrials.gov/assets/uswds/img/icon-https.svg/assets/uswds/img/icon-https.svg https://clinicaltrials.gov/assets/uswds/img/icon-https.svg — 200 — 481 B — 133 ms — h2https://clinicaltrials.gov/assets/main/img/AgencyLogo.svg/assets/main/img/AgencyLogo.svg https://clinicaltrials.gov/assets/main/img/AgencyLogo.svg — 200 — 9.0 KiB — 136 ms — h2https://clinicaltrials.gov/assets/images/ctg-header-logo.svg/assets/images/ctg-header-logo.svg https://clinicaltrials.gov/assets/images/ctg-header-logo.svg — 200 — 3.4 KiB — 139 ms — h2https://clinicaltrials.gov/assets/images/nih-nlm-ncbi-logo.png/assets/images/nih-nlm-ncbi-logo.pn... https://clinicaltrials.gov/assets/images/nih-nlm-ncbi-logo.png — 200 — 230.6 KiB — 159 ms — h2https://clinicaltrials.gov/assets/images/close.png/assets/images/close.png https://clinicaltrials.gov/assets/images/close.png — 200 — 368 B — 149 ms — h2https://clinicaltrials.gov/assets/images/warning.svg/assets/images/warning.svg https://clinicaltrials.gov/assets/images/warning.svg — 200 — 1.0 KiB — 142 ms — h2https://clinicaltrials.gov/assets/images/ctg-footer-logo.svg/assets/images/ctg-footer-logo.svg https://clinicaltrials.gov/assets/images/ctg-footer-logo.svg — 200 — 1.9 KiB — 146 ms — h2https://clinicaltrials.gov/assets/uswds/img/usa-icons/warning.svg/assets/uswds/img/usa-icons/warning... https://clinicaltrials.gov/assets/uswds/img/usa-icons/warning.svg — 200 — 235 B — 136 ms — h2https://clinicaltrials.gov/assets/favicons/favicon.svg/assets/favicons/favicon.svg https://clinicaltrials.gov/assets/favicons/favicon.svg — 200 — 1.1 KiB — 130 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.govsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.gov — 200 — 18.6 KiB — 29 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.govsiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=clinicaltrials.gov — 200 — 35.9 KiB — 63 ms — h2https://cdn.ncbi.nlm.nih.gov/ncbi-media/alerts/alerts.jsoncdn.ncbi.nlm.nih.gov/ncbi-media/ale... https://cdn.ncbi.nlm.nih.gov/ncbi-media/alerts/alerts.json — 200 — 0 B — 186 ms — h3https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition — 200 — 80 B — 138 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=Condition — 200 — 79 B — 258 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=InterventionName/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=InterventionName — 200 — 83 B — 132 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName — 200 — 79 B — 133 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LeadSponsorName — 200 — 79 B — 260 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_dikYWqsjiUWN0Q5&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=websiteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Targeting.php?Q_ZoneID=ZN_dikYWqsjiUWN0Q5&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web — 200 — 6.5 KiB — 154 ms — h2https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LocationFacility/api/int/suggest?input=&dictionary=... https://clinicaltrials.gov/api/int/suggest?input=&dictionary=LocationFacility — 200 — 79 B — 133 ms — h2https://clinicaltrials.gov/assets/favicons/favicon.svg/assets/favicons/favicon.svg https://clinicaltrials.gov/assets/favicons/favicon.svg — 200 — 0 B — 2 ms — h2https://cdn.ncbi.nlm.nih.gov/ncbi-media/alerts/alerts.jsoncdn.ncbi.nlm.nih.gov/ncbi-media/ale... https://cdn.ncbi.nlm.nih.gov/ncbi-media/alerts/alerts.json — 200 — 88 B — 7 ms — h3https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprisesiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/CoreModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprise — 200 — 30.9 KiB — 14 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/7.f7df015b06d8a90ce822.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprisesiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/7.f7df015b06d8a90ce822.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprise — 200 — 1.4 KiB — 14 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/1.bc67e778235741631577.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprisesiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/1.bc67e778235741631577.chunk.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprise — 200 — 7.1 KiB — 17 ms — h2https://siteintercept.qualtrics.com/dxjsmodule/FeedbackButtonModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprisesiteintercept.qualtrics.com/dxjsmod... https://siteintercept.qualtrics.com/dxjsmodule/FeedbackButtonModule.js?Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BRANDID=nlmenterprise — 200 — 19.4 KiB — 16 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=SI_bKiAbBcUpLnKJkG&Version=85&Q_ORIGIN=https://clinicaltrials.gov&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1siteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=SI_bKiAbBcUpLnKJkG&Version=85&Q_ORIGIN=https://clinicaltrials.gov&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1 — 200 — 1.7 KiB — 27 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=CR_0xPTUK44OaAt52u&Version=1&Q_InterceptID=SI_bKiAbBcUpLnKJkG&Q_ORIGIN=https://clinicaltrials.gov&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1siteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/Asset.php?Module=CR_0xPTUK44OaAt52u&Version=1&Q_InterceptID=SI_bKiAbBcUpLnKJkG&Q_ORIGIN=https://clinicaltrials.gov&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&Q_BrandTier=RQqcwhV2J1&Q_ARCACHEVERSION=21&Q_BRANDDC=iad1 — 200 — 792 B — 27 ms — h2https://iad1.qualtrics.com/WRQualtricsSiteIntercept/Graphic.php?IM=IM_cTi8DT6KZkcCkUmiad1.qualtrics.com/WRQualtricsSiteI... https://iad1.qualtrics.com/WRQualtricsSiteIntercept/Graphic.php?IM=IM_cTi8DT6KZkcCkUm — 200 — 2.3 KiB — 319 ms — h2https://siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_Impress=1&Q_CID=CR_0xPTUK44OaAt52u&Q_SIID=SI_bKiAbBcUpLnKJkG&Q_ASID=AS_65741875&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&r=1776801224135siteintercept.qualtrics.com/WRSiteI... https://siteintercept.qualtrics.com/WRSiteInterceptEngine/?Q_Impress=1&Q_CID=CR_0xPTUK44OaAt52u&Q_SIID=SI_bKiAbBcUpLnKJkG&Q_ASID=AS_65741875&Q_CLIENTVERSION=2.46.0&Q_CLIENTTYPE=web&r=1776801224135 — 200 — 250 B — 135 ms — h2https://siteintercept.qualtrics.com/WRQualtricsShared/Graphics/siteintercept/wr-dialog-close-btn-white.pngsiteintercept.qualtrics.com/WRQualt... https://siteintercept.qualtrics.com/WRQualtricsShared/Graphics/siteintercept/wr-dialog-close-btn-white.png — 307 — 226 B — 13 ms — h2https://siteintercept.qualtrics.com/static/q-siteintercept/~/img/wr-dialog-close-btn-white.pngsiteintercept.qualtrics.com/static/... https://siteintercept.qualtrics.com/static/q-siteintercept/~/img/wr-dialog-close-btn-white.png — 307 — 212 B — 13 ms — h2https://siteintercept.qualtrics.com/static/q-siteintercept/7a60db0a092ca9fa11ea8d85c6482411984c89e6/img/wr-dialog-close-btn-white.pngsiteintercept.qualtrics.com/static/... https://siteintercept.qualtrics.com/static/q-siteintercept/7a60db0a092ca9fa11ea8d85c6482411984c89e6/img/wr-dialog-close-btn-white.png — 301 — 207 B — 11 ms — h2https://siteintercept.qualtrics.com/static/q-siteintercept/.blob/56b835a07f920ea8f0bf56870c152414f841792f_wr-dialog-close-btn-white.pngsiteintercept.qualtrics.com/static/... https://siteintercept.qualtrics.com/static/q-siteintercept/.blob/56b835a07f920ea8f0bf56870c152414f841792f_wr-dialog-close-btn-white.png — 200 — 810 B — 13 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
43% of JavaScript execution is third-party
First-party Third-party 2081ms · 495KB · €23/mo
Unattributable
Other
Costly
Execution 926ms
Transfer 0 KB
Monthly Cost €10/mo
Google Tag Manager
Tag Manager
Costly
Execution 295ms
Transfer 147 KB
Unused 42%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 293ms
Transfer 148 KB
Unused 42%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 257ms
Transfer 130 KB
Unused 47%
Monthly Cost €3/mo
siteintercept.qualtrics.com
Other
Optional
Execution 118ms
Transfer 36 KB
Unused 60%
Monthly Cost €1/mo
cdn.ncbi.nlm.nih.gov
Other
Optional
Execution 105ms
Transfer 30 KB
Monthly Cost €1/mo
dap.digitalgov.gov
Other
Optional
Execution 88ms
Transfer 4 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • Unattributable adds 926ms and costs ~€10/month
  • Google Tag Manager adds 295ms and costs ~€3/month
  • Google Tag Manager adds 293ms and costs ~€3/month
  • Google Tag Manager adds 257ms and costs ~€3/month

43% of JavaScript execution time comes from third-party scripts.

Why this matters

Third-party scripts (analytics, ads, social, A/B testing) often dominate execution time — every one is a perf-and-privacy tax.

Learn more ▾

Each third-party script is a black box: you don't control when it loads, what it executes, or how much it grows. They often account for a major share of total blocking time on average sites (HTTP Archive's Web Almanac documents the trend). Audit which ones you actually need, defer the rest, and use facade patterns (lite-youtube, lite-vimeo) for embedded media.

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 926ms 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 295ms 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 293ms 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 257ms 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 siteintercept.qualtrics.com'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.

Send Feedback