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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
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.

3.82 s

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

8.63 s

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

636 ms

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

0.233

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

4.74 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.

13.40 s

Page Load Progression

728 ms
1.5 s
2.2 s
2.9 s
3.6 s
4.4 s
5.1 s
5.8 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
10.6 MB transferred, 67 requests
FIX
10.6 MB transferred, 67 requests
Critical::
Page weighs 13.9 MB (10.6 MB transferred)
Warning::
JavaScript is 1.2 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.2 MB
Info::
CSS is 218 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 218 KB
Info::
67 HTTP requests
Info::
Estimated 2.2 g CO2 per page load
10.6 MB / 2.4 MB budget
10.6 MB transferred
67 requests
2.2 g CO2 per page load
Other 8.6 MiB 81%
JavaScript 1.2 MiB 11%
Images 503.8 KiB 5%
CSS 217.8 KiB 2%
HTML 115.0 KiB 1%
Fonts 70.6 KiB 1%
Other 4.8 KiB 0%
Other 3.5 KiB 0%
Other 1.0 KiB 0%
Other 556 B 0%
Other 0 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

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

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 (10.6 MiB of 10.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
3483ms total JS execution
FIX
3483ms total JS execution
Warning::
https://www.ucsc.edu/: 1158ms CPU time
Warning::
Unattributable: 885ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BWJ4...: 490ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5RF...: 287ms CPU time
Warning::
https://js-agent.newrelic.com/nr-spa-1.313.0.min.j...: 265ms CPU time
Warning::
Third-party scripts: 3483ms (100% of total)

Main Thread Breakdown

Script Evaluation 39% Other 29% Style & Layout 20% Script Parsing & Compilation 6%
ScriptTotalScriptingParse/CompileParty
https://www.ucsc.edu/1158ms214ms32ms3rd
Unattributable885ms33ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-BWJ4Z4Y66X&cx=c&gtm=4e64h1490ms399ms86ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5RFHNC287ms228ms53ms3rd
https://js-agent.newrelic.com/nr-spa-1.313.0.min.js265ms211ms14ms3rd
https://siteimproveanalytics.com/js/siteanalyze_8343.js126ms95ms28ms3rd
https://www.ucsc.edu/wp-content/themes/ucsc-2022/build/theme.js?ver=4.3.299ms35ms3ms3rd
https://ucsc-truss.netlify.app/ucsc-trss/p-53c133ae.js63ms41ms0ms3rd
https://www.ucsc.edu/wp-includes/js/wp-emoji-release.min.js?ver=6.9.460ms56ms3ms3rd
https://script.crazyegg.com/pages/scripts/0000/4979.js50ms44ms1ms3rd
D
Page Weight Inventory
Action
67 resources · 10.6 MB · 128 KB savings available
FIX
67 resources · 10.6 MB · 128 KB savings available
Warning::
Page weight 9.6 MB over 1MB target
Got: 10.6 MB Expected: ≤ 1 MB
Info::
~128 KB of savings available
Warning::
66 third-party resources (100% of weight)
Info::
2 resources over 200KB
67 resources · 10.6 MiB · 66 third-party 9.6 MiB over 1MB target
Media 81% · 8.6 MiB
JavaScript 11% · 1.2 MiB
Image 5% · 510.0 KiB
CSS 2% · 217.8 KiB
Document 1% · 115.2 KiB
Font 1% · 70.6 KiB
Other 0% · 3.5 KiB

~128.1 KiB of savings available

Remove unused JavaScript: 128.1 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
11 images, 0 KB saveable
REVIEW
11 images, 0 KB saveable
Info::
All images are well-optimized
11 images 504 KB
0 oversized -0 KB
7 legacy format
0 missing dimensions CLS risk
B
JS Bundles
18 scripts, 128 KB unused
REVIEW
18 scripts, 128 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-BWJ4...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5RF...: 63 KB unused (49%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 128 KB
128 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-BWJ4Z4Y66X&cx=c&gtm=4e64h1154 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5RFHNC129 KB63 KB (49%)✓3rd
https://siteimproveanalytics.com/js/siteanalyze_8343.js41 KB—✓3rd
https://script.crazyegg.com/pages/scripts/0000/4979.js3 KB—✓3rd
https://ucsc-truss.netlify.app/ucsc-trss/ucsc-trss.esm.js1 KB—✓3rd
https://ucsc-truss.netlify.app/ucsc-trss/p-53c133ae.js5 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=root,base193 KB—✓3rd
https://www.youtube.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.ucsc.edu/wp-content/themes/ucsc-2022/build/theme.js?ver=4.3.27 KB—✓3rd
https://www.ucsc.edu/wp-content/plugins/ucsc-custom-functionality/build/views/news-block/index.js?ver=6.9.40 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

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
2 fonts (71 KB)
PASS
2 fonts (71 KB)
Info::
2 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

2

71 KB total

Render-blocking

0

of 2

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://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 36.7 KiB — 16 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 22 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 37 KB
Load time 16 ms
Start 861 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 22 ms
Start 987 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
4 hints, 0 missing preconnects
PASS
4 hints, 0 missing preconnects
Info::
Page uses 4 resource hint(s)

Current Resource Hints

preconnect
2
preload
—
dns-prefetch
2
prefetch
—

4 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
Network Waterfall
67 requests over 4317ms
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://ucsc.edu// https://ucsc.edu/ — 301 — 199 B — 402 ms — h2https://www.ucsc.edu/www.ucsc.edu/ https://www.ucsc.edu/ — 200 — 58.8 KiB — 234 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/icon-block.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/icon-block.css?ver=6.9.4 — 200 — 349 B — 15 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/paragraph.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/paragraph.css?ver=6.9.4 — 200 — 444 B — 30 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/columns.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/columns.css?ver=6.9.4 — 200 — 624 B — 18 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/separator.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/separator.css?ver=6.9.4 — 200 — 348 B — 16 ms — h2https://www.ucsc.edu/wp-includes/blocks/cover/style.min.css?ver=6.9.4www.ucsc.edu/wp-includes/blocks/cov... https://www.ucsc.edu/wp-includes/blocks/cover/style.min.css?ver=6.9.4 — 200 — 2.3 KiB — 22 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/image.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/image.css?ver=6.9.4 — 200 — 398 B — 30 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/button.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/button.css?ver=6.9.4 — 200 — 632 B — 33 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/post-content.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/post-content.css?ver=6.9.4 — 200 — 526 B — 47 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/style.css?ver=4.3.2www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/style.css?ver=4.3.2 — 200 — 624 B — 31 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/build/style-index.css?ver=4.3.2www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/build/style-index.css?ver=4.3.2 — 200 — 69.6 KiB — 52 ms — h2https://fonts.googleapis.com/css?family=Roboto%3A100%2C300%2C400%2C500%2C600%2C700%2C800&display=swap&ver=6.9.4fonts.googleapis.com/css?family=Rob... https://fonts.googleapis.com/css?family=Roboto%3A100%2C300%2C400%2C500%2C600%2C700%2C800&display=swap&ver=6.9.4 — 200 — 2.5 KiB — 56 ms — h2https://www.ucsc.edu/wp-includes/css/dashicons.min.css?ver=6.9.4www.ucsc.edu/wp-includes/css/dashic... https://www.ucsc.edu/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 36.1 KiB — 52 ms — h2https://www.ucsc.edu/wp-content/plugins/ucsc-custom-functionality/build/views/news-block/style-index.css?ver=6.9.4www.ucsc.edu/wp-content/plugins/ucs... https://www.ucsc.edu/wp-content/plugins/ucsc-custom-functionality/build/views/news-block/style-index.css?ver=6.9.4 — 404 — 338 B — 47 ms — h2https://www.ucsc.edu/wp-content/uploads/2023/07/04022020_meadow_LN_01-768x576.jpgwww.ucsc.edu/wp-content/uploads/202... https://www.ucsc.edu/wp-content/uploads/2023/07/04022020_meadow_LN_01-768x576.jpg — 200 — 101.5 KiB — 70 ms — h2https://www.ucsc.edu/wp-content/uploads/2026/04/hydrocatalogue-768x514.jpgwww.ucsc.edu/wp-content/uploads/202... https://www.ucsc.edu/wp-content/uploads/2026/04/hydrocatalogue-768x514.jpg — 200 — 73.3 KiB — 60 ms — h2https://www.ucsc.edu/wp-content/uploads/2026/04/preet-karia-hackathon-768x514.jpgwww.ucsc.edu/wp-content/uploads/202... https://www.ucsc.edu/wp-content/uploads/2026/04/preet-karia-hackathon-768x514.jpg — 200 — 66.0 KiB — 72 ms — h2https://ucsc-truss.netlify.app/ucsc-trss/ucsc-trss.esm.jsucsc-truss.netlify.app/ucsc-trss/uc... https://ucsc-truss.netlify.app/ucsc-trss/ucsc-trss.esm.js — 200 — 1.2 KiB — 66 ms — h2https://ucsc-truss.netlify.app/ucsc-trss/ucsc-trss.cssucsc-truss.netlify.app/ucsc-trss/uc... https://ucsc-truss.netlify.app/ucsc-trss/ucsc-trss.css — 200 — 809 B — 37 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/build/theme.js?ver=4.3.2www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/build/theme.js?ver=4.3.2 — 200 — 6.8 KiB — 30 ms — h2https://www.ucsc.edu/wp-content/plugins/ucsc-custom-functionality/build/views/news-block/index.js?ver=6.9.4www.ucsc.edu/wp-content/plugins/ucs... https://www.ucsc.edu/wp-content/plugins/ucsc-custom-functionality/build/views/news-block/index.js?ver=6.9.4 — 404 — 147 B — 195 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-5RFHNCwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-5RFHNC — 200 — 129.0 KiB — 70 ms — h2https://www.ucsc.edu/wp-content/uploads/2025/11/2025-11-campaign-header.webpwww.ucsc.edu/wp-content/uploads/202... https://www.ucsc.edu/wp-content/uploads/2025/11/2025-11-campaign-header.webp — 200 — 143.3 KiB — 22 ms — h2data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbDpzcGFjZT0icHJlc…data:image/svg+xml;base64,PHN2ZyB4b... data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbDpzcGFjZT0icHJlc… — 200 — 0 B — 2 ms — datahttps://www.ucsc.edu/wp-content/uploads/2026/04/condors-flying-768x512.jpgwww.ucsc.edu/wp-content/uploads/202... https://www.ucsc.edu/wp-content/uploads/2026/04/condors-flying-768x512.jpg — 200 — 28.8 KiB — 9 ms — h2https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2fonts.gstatic.com/s/roboto/v51/KFO7... https://fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 200 — 36.7 KiB — 16 ms — h3https://www.youtube.com/embed/y0177H1ZTNE?feature=oembedwww.youtube.com/embed/y0177H1ZTNE?f... https://www.youtube.com/embed/y0177H1ZTNE?feature=oembed — 200 — 56.2 KiB — 83 ms — h2https://www.ucsc.edu/wp-content/uploads/2025/11/inspiring-change-optmized.m4vwww.ucsc.edu/wp-content/uploads/202... https://www.ucsc.edu/wp-content/uploads/2025/11/inspiring-change-optmized.m4v — 206 — 8.6 MiB — 303 ms — h2https://siteimproveanalytics.com/js/siteanalyze_8343.jssiteimproveanalytics.com/js/siteana... https://siteimproveanalytics.com/js/siteanalyze_8343.js — 200 — 41.1 KiB — 34 ms — h3
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://ucsc.edu// https://ucsc.edu/ — 301 — 199 B — 402 ms — h2https://www.ucsc.edu/www.ucsc.edu/ https://www.ucsc.edu/ — 200 — 58.8 KiB — 234 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/icon-block.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/icon-block.css?ver=6.9.4 — 200 — 349 B — 15 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/paragraph.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/paragraph.css?ver=6.9.4 — 200 — 444 B — 30 ms — h2https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/columns.css?ver=6.9.4www.ucsc.edu/wp-content/themes/ucsc... https://www.ucsc.edu/wp-content/themes/ucsc-2022/wp-blocks/columns.css?ver=6.9.4 — 200 — 624 B — 18 ms — 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http/1.1https://bam.nr-data.net/events/1/NRJS-7ef008c4eac38899288?a=1084213059&v=1.313.0&to=ZlZSMEMCCEsCUE0PDl8ccQdFCglWTEdcCxFdUkQBHAAHVhVSSg%3D%3D&rst=2395&ck=0&s=333268bd9912ab42&ref=https://www.ucsc.edu/&ptid=0d0e6c75df89da2abam.nr-data.net/events/1/NRJS-7ef00... https://bam.nr-data.net/events/1/NRJS-7ef008c4eac38899288?a=1084213059&v=1.313.0&to=ZlZSMEMCCEsCUE0PDl8ccQdFCglWTEdcCxFdUkQBHAAHVhVSSg%3D%3D&rst=2395&ck=0&s=333268bd9912ab42&ref=https://www.ucsc.edu/&ptid=0d0e6c75df89da2a — 200 — 414 B — 443 ms — http/1.1https://bam.nr-data.net/browser/blobs?browser_monitoring_key=NRJS-7ef008c4eac38899288&type=BrowserSessionChunk&app_id=1084213059&protocol_version=0&timestamp=1776805571465&attributes=entityGuid%3DNDE0OTc3NHxCUk9XU0VSfEFQUExJQ0FUSU9OfDExMDMyNzY2MDI%26harvestId%3D333268bd9912ab42_0d0e6c75df89da2a_1%26trace.firstTimestamp%3D1776805571465%26trace.lastTimestamp%3D1776805573841%26trace.nodes%3D95%26trace.originTimestamp%3D1776805571465%26agentVersion%3D1.313.0%26firstSessionHarvest%3Dtrue%26ptid%3D0d0e6c75df89da2a%26session%3D333268bd9912ab42%26currentUrl%3Dhttps://www.ucsc.edu/bam.nr-data.net/browser/blobs?brows... https://bam.nr-data.net/browser/blobs?browser_monitoring_key=NRJS-7ef008c4eac38899288&type=BrowserSessionChunk&app_id=1084213059&protocol_version=0&timestamp=1776805571465&attributes=entityGuid%3DNDE0OTc3NHxCUk9XU0VSfEFQUExJQ0FUSU9OfDExMDMyNzY2MDI%26harvestId%3D333268bd9912ab42_0d0e6c75df89da2a_1%26trace.firstTimestamp%3D1776805571465%26trace.lastTimestamp%3D1776805573841%26trace.nodes%3D95%26trace.originTimestamp%3D1776805571465%26agentVersion%3D1.313.0%26firstSessionHarvest%3Dtrue%26ptid%3D0d0e6c75df89da2a%26session%3D333268bd9912ab42%26currentUrl%3Dhttps://www.ucsc.edu/ — 200 — 414 B — 1.1 s — http/1.1https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 9 ms — h3
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 3483ms · 435KB · $46/mo
www.ucsc.edu
Other
Costly
Execution 1158ms
Transfer 59 KB
Monthly Cost $15/mo
Unattributable
Other
Costly
Execution 885ms
Transfer 0 KB
Monthly Cost $12/mo
Google Tag Manager
Tag Manager
Costly
Execution 490ms
Transfer 154 KB
Unused 42%
Monthly Cost $7/mo
Google Tag Manager
Tag Manager
Costly
Execution 287ms
Transfer 129 KB
Unused 49%
Monthly Cost $4/mo
js-agent.newrelic.com
Other
Costly
Execution 265ms
Transfer 30 KB
Monthly Cost $4/mo
siteimproveanalytics.com
Other
Optional
Execution 126ms
Transfer 41 KB
Monthly Cost $2/mo
www.ucsc.edu
Other
Optional
Execution 99ms
Transfer 7 KB
Monthly Cost $1/mo
ucsc-truss.netlify.app
Other
Optional
Execution 63ms
Transfer 5 KB
Monthly Cost $1/mo
www.ucsc.edu
Other
Optional
Execution 60ms
Transfer 6 KB
Monthly Cost $1/mo
script.crazyegg.com
Other
Optional
Execution 50ms
Transfer 3 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.ucsc.edu adds 1158ms and costs ~$15/month
  • Unattributable adds 885ms and costs ~$12/month
  • Google Tag Manager adds 490ms and costs ~$7/month
  • Google Tag Manager adds 287ms and costs ~$4/month
  • js-agent.newrelic.com adds 265ms and costs ~$4/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.ucsc.edu takes 1158ms 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 885ms 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 490ms 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 287ms 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

js-agent.newrelic.com takes 265ms 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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