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https://uclahealth.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
26
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
95
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

3.84 s

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

8.61 s

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

575 ms

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

0.851

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.

14.12 s

Page Load Progression

513 ms
1.0 s
1.5 s
2.1 s
2.6 s
3.1 s
3.6 s
4.1 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
21.4 MB transferred, 72 requests
FIX
21.4 MB transferred, 72 requests
Critical::
Page weighs 24.1 MB (21.4 MB transferred)
Warning::
JavaScript is 1.8 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.8 MB
Info::
72 HTTP requests
Info::
Estimated 4.5 g CO2 per page load
21.4 MB / 2.4 MB budget
21.4 MB transferred
72 requests
4.5 g CO2 per page load
Other 19.2 MiB 89%
JavaScript 1.8 MiB 8%
CSS 152.2 KiB 1%
Fonts 146.7 KiB 1%
Images 112.6 KiB 1%
HTML 34.9 KiB 0%
Other 25.5 KiB 0%
Other 1.1 KiB 0%
Other 668 B 0%
Other 547 B 0%
0 2.4 MB 4.9 MB
Over budget

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

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 (21.4 MiB of 21.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3441ms total JS execution
FIX
3441ms total JS execution
Warning::
https://www.uclahealth.org/: 1523ms CPU time
Warning::
Unattributable: 546ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NSK...: 532ms CPU time
Warning::
https://www.uclahealth.org/libraries/fontawesome/j...: 316ms CPU time
Info::
https://translate.googleapis.com/_/translate_http/...: 209ms CPU time
Warning::
Third-party scripts: 3441ms (100% of total)

Main Thread Breakdown

Script Evaluation 32% Other 28% Style & Layout 22% Script Parsing & Compilation 8% Rendering 8%
ScriptTotalScriptingParse/CompileParty
https://www.uclahealth.org/1523ms5ms0ms3rd
Unattributable546ms21ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NSK4WRJ532ms478ms40ms3rd
https://www.uclahealth.org/libraries/fontawesome/js/solid.min.js?tdw2bm316ms118ms167ms3rd
https://translate.googleapis.com/_/translate_http/_/js/k=translate_http.tr.es.eNjH1Jo6ldQ.O/am=AAAAAQ/d=1/exm=el_conf/ed=1/rs=AN8SPfq_osd-q7vwQm5aouAQRZibUmx4sg/m=el_main209ms155ms37ms3rd
https://www.uclahealth.org/libraries/alpinejs/cdn.min.js?tdw2bm174ms134ms4ms3rd
https://www.uclahealth.org/libraries/fontawesome/js/fontawesome.min.js?tdw2bm74ms63ms5ms3rd
https://www.uclahealth.org/sites/default/files/js/js_oAL8sBVDhmxxr3L1hRNoeGNV1cqYqebUlgXjTdZUyGs.js?scope=footer&delta=1&language=en&theme=uclahealth&include=eJx9jkEWgzAIRC8UzZF8U4OIxeAL0fb4tXWTdtENMB8GgETIwGo3aBitUExl36B9EqhxjwXPMFmueJDbSrGpez-4vxXk5H9H3FRSYDNWGio48hl-9XXpC65BJd-3vWzmFCVLDfuomAla5wjdJNPiLbvsXT1_ckWltjdTse6QRNZSJ5Rxbkk9k-xriz6u7r2goQOYcp2sjBRXcgdL5hf9FoHl68ms39ms19ms3rd
D
Page Weight Inventory
Action
72 resources · 21.4 MB · 227 KB savings available
FIX
72 resources · 21.4 MB · 227 KB savings available
Warning::
Page weight 20.4 MB over 1MB target
Got: 21.4 MB Expected: ≤ 1 MB
Info::
~227 KB of savings available
Warning::
71 third-party resources (100% of weight)
Info::
3 resources over 200KB
72 resources · 21.4 MiB · 71 third-party 20.4 MiB over 1MB target
Media 89% · 19.2 MiB
JavaScript 8% · 1.8 MiB
CSS 1% · 152.2 KiB
Font 1% · 146.7 KiB
Image 1% · 113.1 KiB
Document 0% · 35.2 KiB
Other 0% · 27.1 KiB

~227.0 KiB of savings available

Remove unused JavaScript: 227.0 KiB
B
Image Optimization
8 images, 0 KB saveable
REVIEW
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 113 KB
0 oversized -0 KB
6 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
36 scripts, 227 KB unused
REVIEW
36 scripts, 227 KB unused
Warning::
https://translate.googleapis.com/_/translate_http/...: 94 KB unused (79%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-NSK...: 55 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uclahealth.org/sites/default/files/js/...: 34 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://tags.tiqcdn.com/utag/uclahealth/main/prod/...: 24 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.uclahealth.org/core/assets/vendor/jque...: 20 KB unused (73%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 227 KB
227 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://translate.googleapis.com/_/translate_http/_/js/k=translate_http.tr.es.eNjH1Jo6ldQ.O/am=AAAAAQ/d=1/exm=el_conf/ed=1/rs=AN8SPfq_osd-q7vwQm5aouAQRZibUmx4sg/m=el_main119 KB94 KB (79%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-NSK4WRJ140 KB55 KB (39%)✓3rd
https://www.uclahealth.org/sites/default/files/js/js_oAL8sBVDhmxxr3L1hRNoeGNV1cqYqebUlgXjTdZUyGs.js?scope=footer&delta=1&language=en&theme=uclahealth&include=eJx9jkEWgzAIRC8UzZF8U4OIxeAL0fb4tXWTdtENMB8GgETIwGo3aBitUExl36B9EqhxjwXPMFmueJDbSrGpez-4vxXk5H9H3FRSYDNWGio48hl-9XXpC65BJd-3vWzmFCVLDfuomAla5wjdJNPiLbvsXT1_ckWltjdTse6QRNZSJ5Rxbkk9k-xriz6u7r2goQOYcp2sjBRXcgdL5hf9FoHl47 KB34 KB (73%)✓3rd
https://tags.tiqcdn.com/utag/uclahealth/main/prod/utag.js33 KB24 KB (73%)✓3rd
https://www.uclahealth.org/core/assets/vendor/jquery/jquery.min.js?v=4.0.028 KB20 KB (73%)✓3rd
https://translate-pa.googleapis.com/v1/supportedLanguages?client=te&display_language=es&key=AIzaSyBWDj0QJvVIx8XOhRegXX5_SrRWxhT5Hs4&callback=callback3 KB—✓3rd
https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/js/rpc-manager.iife.js3 KB—✓3rd
https://www.uclahealth.org/sites/default/files/js/js_ODMTJHTlsYFUZOBe2v4CnOkI7WIXP8zmmUB8fKiO6is.js?scope=footer&delta=6&language=en&theme=uclahealth&include=eJx9jkEWgzAIRC8UzZF8U4OIxeAL0fb4tXWTdtENMB8GgETIwGo3aBitUExl36B9EqhxjwXPMFmueJDbSrGpez-4vxXk5H9H3FRSYDNWGio48hl-9XXpC65BJd-3vWzmFCVLDfuomAla5wjdJNPiLbvsXT1_ckWltjdTse6QRNZSJ5Rxbkk9k-xriz6u7r2goQOYcp2sjBRXcgdL5hf9FoHl1 KB—✓3rd
https://www.uclahealth.org/libraries/fontawesome/js/fontawesome.min.js?tdw2bm16 KB—✓3rd
https://www.uclahealth.org/libraries/fontawesome/js/brands.min.js?tdw2bm3 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

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
7 fonts (147 KB)
PASS
7 fonts (147 KB)
Info::
7 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

7

147 KB total

Render-blocking

0

of 7

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 3.8 s LCP 8.6 shttps://use.typekit.net/af/b78836/00000000000000007735ba66/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/b78836/00000000000000007735ba66/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 19.5 KiB — 24 ms — font-display: swaphttps://use.typekit.net/af/f82cc1/00000000000000007735ba3f/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/f82cc1/00000000000000007735ba3f/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 20.2 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/8fe766/00000000000000007735b3d4/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3l https://use.typekit.net/af/8fe766/00000000000000007735b3d4/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n5&v=3 — 45.8 KiB — 21 ms — font-display: swaphttps://use.typekit.net/af/29fcc8/00000000000000007735ba6d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3l https://use.typekit.net/af/29fcc8/00000000000000007735ba6d/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i7&v=3 — 20.3 KiB — 17 ms — font-display: swaphttps://use.typekit.net/af/685cbf/00000000000000007735ba65/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/685cbf/00000000000000007735ba65/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 19.9 KiB — 13 ms — font-display: swaphttps://use.typekit.net/af/8d0537/00000000000000007735ba61/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3l https://use.typekit.net/af/8d0537/00000000000000007735ba61/31/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n8&v=3 — 19.4 KiB — 8 ms — font-display: swaphttps://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/sfsites/c/resource/UCLAUCLA https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/sfsites/c/resource/UCLA — 1.6 KiB — 13 ms — font-display: swap
l woff2 swap
Size 19 KB
Load time 24 ms
Start 827 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 17 ms
Start 827 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 46 KB
Load time 21 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 17 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 20 KB
Load time 13 ms
Start 828 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 19 KB
Load time 8 ms
Start 1.0 s
Risk FOUT — text flashes from fallback to web font
UCLA unknown swap
Size 2 KB
Load time 13 ms
Start 2.1 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
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
HTTP Caching
max-age=31536000 (52 weeks)
PASS
max-age=31536000 (52 weeks)
Info::
Cache-Control header is set
Got: max-age=31536000
Info::
Effective TTL: 52 weeks (max-age=31536000)
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

max-age=31536000

DirectiveValueMeaning
max-age31536000Cache for 52 weeks
Effective TTL: 31536000 seconds
Network Waterfall
72 requests over 2238ms
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 3.8 s LCP 8.6 shttps://uclahealth.org// https://uclahealth.org/ — 301 — 258 B — 530 ms — h2https://www.uclahealth.org/www.uclahealth.org/ https://www.uclahealth.org/ — 200 — 21.6 KiB — 88 ms — h2https://www.uclahealth.org/sites/default/files/css/css_-NVVepYvDezMHg-GG2o3UsrQP5YQ95KGhkbNL3BKoQU.css?delta=0&language=en&theme=uclahealth&include=eJx1kEFuxCAMRS8UmiNVP-Ah7jiYGhM1t29G6iJk1AULP8Oz-eAZ_JlFF8gU1WhO1ivkA1_4GUBiiOZJuDxrt6qNZuHFYMfUjua0zQsaTT0KVoL4OkeIaPcRWbrXLWTjkWpxKh5WzqucZ1RoPewNOsLdneDDOg-Cd6P0dvGh6mRX8pfHhQiO21c2Kj1UFY7HFVdkCs4uw-xqvJ1JhYKdM5y1XLvfnePzFWy7UiOk07QNokawuI4kvnzhLBOXfG31wjtZg_wzd-dEej40_QUBMMh5www.uclahealth.org/sites/default/fi... https://www.uclahealth.org/sites/default/files/css/css_-NVVepYvDezMHg-GG2o3UsrQP5YQ95KGhkbNL3BKoQU.css?delta=0&language=en&theme=uclahealth&include=eJx1kEFuxCAMRS8UmiNVP-Ah7jiYGhM1t29G6iJk1AULP8Oz-eAZ_JlFF8gU1WhO1ivkA1_4GUBiiOZJuDxrt6qNZuHFYMfUjua0zQsaTT0KVoL4OkeIaPcRWbrXLWTjkWpxKh5WzqucZ1RoPewNOsLdneDDOg-Cd6P0dvGh6mRX8pfHhQiO21c2Kj1UFY7HFVdkCs4uw-xqvJ1JhYKdM5y1XLvfnePzFWy7UiOk07QNokawuI4kvnzhLBOXfG31wjtZg_wzd-dEej40_QUBMMh5 — 200 — 2.3 KiB — 53 ms — h2https://www.uclahealth.org/sites/default/files/css/css_Yh5_5TfqsTkBGl5YrafYSuy1ZmWShk0cCFaO2vH5yjE.css?delta=1&language=en&theme=uclahealth&include=eJx1kEFuxCAMRS8UmiNVP-Ah7jiYGhM1t29G6iJk1AULP8Oz-eAZ_JlFF8gU1WhO1ivkA1_4GUBiiOZJuDxrt6qNZuHFYMfUjua0zQsaTT0KVoL4OkeIaPcRWbrXLWTjkWpxKh5WzqucZ1RoPewNOsLdneDDOg-Cd6P0dvGh6mRX8pfHhQiO21c2Kj1UFY7HFVdkCs4uw-xqvJ1JhYKdM5y1XLvfnePzFWy7UiOk07QNokawuI4kvnzhLBOXfG31wjtZg_wzd-dEej40_QUBMMh5www.uclahealth.org/sites/default/fi... https://www.uclahealth.org/sites/default/files/css/css_Yh5_5TfqsTkBGl5YrafYSuy1ZmWShk0cCFaO2vH5yjE.css?delta=1&language=en&theme=uclahealth&include=eJx1kEFuxCAMRS8UmiNVP-Ah7jiYGhM1t29G6iJk1AULP8Oz-eAZ_JlFF8gU1WhO1ivkA1_4GUBiiOZJuDxrt6qNZuHFYMfUjua0zQsaTT0KVoL4OkeIaPcRWbrXLWTjkWpxKh5WzqucZ1RoPewNOsLdneDDOg-Cd6P0dvGh6mRX8pfHhQiO21c2Kj1UFY7HFVdkCs4uw-xqvJ1JhYKdM5y1XLvfnePzFWy7UiOk07QNokawuI4kvnzhLBOXfG31wjtZg_wzd-dEej40_QUBMMh5 — 200 — 2.5 KiB — 36 ms — h2https://use.typekit.net/hyh4ixj.cssuse.typekit.net/hyh4ixj.css https://use.typekit.net/hyh4ixj.css — 200 — 1.2 KiB — 82 ms — 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https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/view/3ee221efd330f8f49aea18797eeac3b8/prod/en-US/frame_view — 200 — 19.4 KiB — 62 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/styles/embedded-messaging-styling.min.css?eb629b7509uclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/styles/embedded-messaging-styling.min.css?eb629b7509 — 200 — 768 B — 81 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/styles/salesforce-lightning-design-system.min.css?eb629b7509uclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/styles/salesforce-lightning-design-system.min.css?eb629b7509 — 200 — 102.0 KiB — 66 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/o11y/246/config?asGuest=true&o11y=1uclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/o11y/246/config?asGuest=true&o11y=1 — 200 — 625 B — 60 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/component/f2955555e0a68e9a0806e1fb4ad01992/prod/en-US/lightning/auraDynamic_cmpuclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/component/f2955555e0a68e9a0806e1fb4ad01992/prod/en-US/lightning/auraDynamic_cmp — 200 — 584 B — 11 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/js/rpc-manager.iife.jsuclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/assets/js/rpc-manager.iife.js — 200 — 3.1 KiB — 13 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/log/metricsuclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/log/metrics — 200 — 668 B — 202 ms — h2https://www.uclahealth.org/themes/custom/uclahealth/favicons/favicon-32x32.png?tdw2bmwww.uclahealth.org/themes/custom/uc... https://www.uclahealth.org/themes/custom/uclahealth/favicons/favicon-32x32.png?tdw2bm — 200 — 495 B — 30 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/component/769a3bbaf4b329a78402db88550744d6/prod/en-US/o11y/simple_collector_cmpuclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/component/769a3bbaf4b329a78402db88550744d6/prod/en-US/o11y/simple_collector_cmp — 200 — 1.9 KiB — 12 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/component/0af3d31fc8338a2518abfa12ed682846/prod/en-US/o11y/collectors_cmpuclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/component/0af3d31fc8338a2518abfa12ed682846/prod/en-US/o11y/collectors_cmp — 200 — 22.2 KiB — 13 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/log/metrics?o11y=2uclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/webruntime/log/metrics?o11y=2 — 200 — 685 B — 204 ms — h2https://www.uclahealth.org/themes/custom/uclahealth/favicons/favicon-16x16.pngwww.uclahealth.org/themes/custom/uc... https://www.uclahealth.org/themes/custom/uclahealth/favicons/favicon-16x16.png — 200 — 560 B — 142 ms — h2https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/sfsites/c/resource/UCLAuclahealth.my.site.com/ESWPatientIn... https://uclahealth.my.site.com/ESWPatientInformationAgen1772145536473/sfsites/c/resource/UCLA — 200 — 1.6 KiB — 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
100% of JavaScript execution is third-party
First-party Third-party 3441ms · 792KB · $46/mo
www.uclahealth.org
Other
Costly
Execution 1523ms
Transfer 22 KB
Monthly Cost $20/mo
Unattributable
Other
Costly
Execution 546ms
Transfer 0 KB
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 532ms
Transfer 140 KB
Unused 39%
Monthly Cost $7/mo
www.uclahealth.org
Other
Costly
Execution 316ms
Transfer 433 KB
Monthly Cost $4/mo
translate.googleapis.com
Other
Costly
Execution 209ms
Transfer 119 KB
Unused 79%
Monthly Cost $3/mo
www.uclahealth.org
Other
Optional
Execution 174ms
Transfer 16 KB
Monthly Cost $2/mo
www.uclahealth.org
Other
Optional
Execution 74ms
Transfer 16 KB
Monthly Cost $1/mo
www.uclahealth.org
Other
Optional
Execution 68ms
Transfer 47 KB
Unused 73%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.uclahealth.org adds 1523ms and costs ~$20/month
  • Unattributable adds 546ms and costs ~$7/month
  • Google Tag Manager adds 532ms and costs ~$7/month
  • www.uclahealth.org adds 316ms and costs ~$4/month
  • translate.googleapis.com adds 209ms 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.uclahealth.org takes 1523ms 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 546ms 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 532ms 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.uclahealth.org takes 316ms 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

translate.googleapis.com takes 209ms 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

79% of translate.googleapis.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

73% of www.uclahealth.org's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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