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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
74
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
82
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
89
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
81
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.

1.32 s

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

2.42 s

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

4 ms

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

0.000

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

1.45 s

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

3.55 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
15
5 PASS 4 REVIEW 4 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 63 requests
FIX
3.6 MB transferred, 63 requests
Warning::
Page weighs 8.3 MB (3.6 MB transferred)
Warning::
Images are 1.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.7 MB
Warning::
JavaScript is 1.4 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.4 MB
Info::
63 HTTP requests
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
63 requests
0.76 g CO2 per page load
Images 1.7 MiB 47%
JavaScript 1.4 MiB 39%
HTML 196.0 KiB 5%
CSS 191.1 KiB 5%
Fonts 124.0 KiB 3%
Other 2.9 KiB 0%
Other 1.2 KiB 0%
Other 63 B 0%
Other 0 B 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

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 (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
63 resources · 3.6 MB · 226 KB savings available
FIX
63 resources · 3.6 MB · 226 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~226 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
3 resources over 200KB
63 resources · 3.6 MiB · 62 third-party 2.6 MiB over 1MB target
Image 47% · 1.7 MiB
JavaScript 39% · 1.4 MiB
Document 5% · 196.7 KiB
CSS 5% · 191.1 KiB
Font 3% · 124.0 KiB
Other 0% · 2.2 KiB

~226.0 KiB of savings available

Remove unused JavaScript: 226.0 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
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Warning::
https://www.ucsb.edu/sites/default/files/images/20... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
19 images 1.7 MB
0 oversized -0 KB
12 legacy format
1 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

B
JS Execution Cost
679ms total JS execution
REVIEW
679ms total JS execution
Warning::
https://www.ucsb.edu/: 254ms CPU time
Info::
https://www.ucsb.edu/sites/default/files/js/js_B_y...: 123ms CPU time
Info::
Unattributable: 99ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-MTK...: 94ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-E0YR...: 58ms CPU time
Warning::
Third-party scripts: 679ms (100% of total)

Main Thread Breakdown

Script Evaluation 42% Other 24% Style & Layout 16% Script Parsing & Compilation 10% Parse HTML & CSS 7%
ScriptTotalScriptingParse/CompileParty
https://www.ucsb.edu/254ms4ms0ms3rd
https://www.ucsb.edu/sites/default/files/js/js_B_ydWLMslrBqD99e6qotqcM8a4VESq8ene68DYIyfLk.js?scope=footer&delta=0&language=en&theme=ucsb&include=eJxlj-EOwiAMhF-I2UciBTvEsJWUoptPL1uUxfnnevell7SOWYsKZnBfZ7OQjXNU0xFkzvwgMZ4Ti-MFrjRiTdpBK6Q4E5yyCcwhkVUMEJqc8wXvuPzCySR8rbCJqb442GQoXmLWspMnuePaoZCvEnUdMqq_0bHymb3a_Mgy2eOrP_IGqflq8w123ms66ms13ms3rd
Unattributable99ms21ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MTKJ2J94ms74ms18ms3rd
https://www.googletagmanager.com/gtag/js?id=G-E0YR1WN7C7&cx=c&gtm=4e64k0h258ms43ms14ms3rd
https://connect.facebook.net/en_US/fbevents.js50ms35ms15ms3rd
C
JS Bundles
Action
21 scripts, 226 KB unused
REVIEW
21 scripts, 226 KB unused
Warning::
https://www.ucsb.edu/sites/default/files/js/js_B_y...: 67 KB unused (62%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-E0YR...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MTK...: 61 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 33 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 226 KB
226 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.ucsb.edu/sites/default/files/js/js_B_ydWLMslrBqD99e6qotqcM8a4VESq8ene68DYIyfLk.js?scope=footer&delta=0&language=en&theme=ucsb&include=eJxlj-EOwiAMhF-I2UciBTvEsJWUoptPL1uUxfnnevell7SOWYsKZnBfZ7OQjXNU0xFkzvwgMZ4Ti-MFrjRiTdpBK6Q4E5yyCcwhkVUMEJqc8wXvuPzCySR8rbCJqb442GQoXmLWspMnuePaoZCvEnUdMqq_0bHymb3a_Mgy2eOrP_IGqflq8w108 KB67 KB (62%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-E0YR1WN7C7&cx=c&gtm=4e64k0h2153 KB65 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MTKJ2J138 KB61 KB (45%)✓3rd
https://connect.facebook.net/en_US/fbevents.js97 KB33 KB (34%)✓3rd
https://www.campuscalendar.ucsb.edu/widget/view?schools=ucsb&days=365&num=4&tags=EDU+Feature&match=any&hidedesc=1&style=none&school=ucsb5 KB—✓3rd
https://siteimproveanalytics.com/js/siteanalyze_8343.js41 KB—✓3rd
https://player.vimeo.com/api/player.js9 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.ucsb.edu/libraries/lazysizes/lazysizes.min.js4 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

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
3 fonts (124 KB)
PASS
3 fonts (124 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

124 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.4 shttps://fonts.gstatic.com/s/nunitosans/v19/pe0AMImSLYBIv1o4X1M8ce2xCx3yop4tQpF_MeTm0lfUVwoNnq4CLz0_kJ3xzHGGVFM.woff2pe0AMImSLYBIv1o4X1M8ce2... https://fonts.gstatic.com/s/nunitosans/v19/pe0AMImSLYBIv1o4X1M8ce2xCx3yop4tQpF_MeTm0lfUVwoNnq4CLz0_kJ3xzHGGVFM.woff2 — 48.5 KiB — 18 ms — font-display: swaphttps://webfonts.brand.ucsb.edu/Produkt/Produkt-Light-Web.woff2Produkt-Light-Web.woff2 https://webfonts.brand.ucsb.edu/Produkt/Produkt-Light-Web.woff2 — 41.7 KiB — 181 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 39 ms — font-display: swap
pe0AMImSLYBIv1o4X1M8ce2... woff2 swap
Size 48 KB
Load time 18 ms
Start 329 ms
Risk FOUT — text flashes from fallback to web font
Produkt-Light-Web.woff2 woff2 swap
Size 42 KB
Load time 181 ms
Start 329 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 39 ms
Start 399 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
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
63 requests over 1567ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.3 s LCP 2.4 shttps://ucsb.edu// https://ucsb.edu/ — 301 — 199 B — 21 ms — h2https://www.ucsb.edu/www.ucsb.edu/ https://www.ucsb.edu/ — 200 — 140.3 KiB — 151 ms — h2https://www.ucsb.edu/sites/default/files/css/css_4tfMfCGfvCFawnJZk8C-3TUkjNZZLKIAVJ1Q7OoKnhY.css?delta=0&language=en&theme=ucsb&include=eJxtkOFuwyAMhF-IhUdCBkziFjDDJm3ffiRTNVXLDw7pvjM6AyKojuoNg3K3QWQJXArWgFPUwBWvOwdQ4nqFU8bnlb9xwQYrXrGWHle2KKTkWudE-XJuZwoo7nuwophwx0gTuRHE-6HK1f5eX6Kv-cJHgOYe9pA35Mzd89NGTDCyTqOjjX00yAvc4GkiraSQ3bvIPj-I-8tCLFRNgw5rh7bJe-jPWUZtw2eSDaORlygW60HQHEXsIWcJquvpuLVTdG1jZUczK7YA1Y_IA72dJ3FVMTvhQ-ypS-E45jYn68V5ZhWdJew_5wf2Rci9www.ucsb.edu/sites/default/files/cs... https://www.ucsb.edu/sites/default/files/css/css_4tfMfCGfvCFawnJZk8C-3TUkjNZZLKIAVJ1Q7OoKnhY.css?delta=0&language=en&theme=ucsb&include=eJxtkOFuwyAMhF-IhUdCBkziFjDDJm3ffiRTNVXLDw7pvjM6AyKojuoNg3K3QWQJXArWgFPUwBWvOwdQ4nqFU8bnlb9xwQYrXrGWHle2KKTkWudE-XJuZwoo7nuwophwx0gTuRHE-6HK1f5eX6Kv-cJHgOYe9pA35Mzd89NGTDCyTqOjjX00yAvc4GkiraSQ3bvIPj-I-8tCLFRNgw5rh7bJe-jPWUZtw2eSDaORlygW60HQHEXsIWcJquvpuLVTdG1jZUczK7YA1Y_IA72dJ3FVMTvhQ-ypS-E45jYn68V5ZhWdJew_5wf2Rci9 — 200 — 11.5 KiB — 28 ms — h2https://www.ucsb.edu/sites/default/files/css/css_X8m2drtF_AsFDFx_b8NH6AbWcRo5cj2TLwICBE-2P1g.css?delta=1&language=en&theme=ucsb&include=eJxtkOFuwyAMhF-IhUdCBkziFjDDJm3ffiRTNVXLDw7pvjM6AyKojuoNg3K3QWQJXArWgFPUwBWvOwdQ4nqFU8bnlb9xwQYrXrGWHle2KKTkWudE-XJuZwoo7nuwophwx0gTuRHE-6HK1f5eX6Kv-cJHgOYe9pA35Mzd89NGTDCyTqOjjX00yAvc4GkiraSQ3bvIPj-I-8tCLFRNgw5rh7bJe-jPWUZtw2eSDaORlygW60HQHEXsIWcJquvpuLVTdG1jZUczK7YA1Y_IA72dJ3FVMTvhQ-ypS-E45jYn68V5ZhWdJew_5wf2Rci9www.ucsb.edu/sites/default/files/cs... https://www.ucsb.edu/sites/default/files/css/css_X8m2drtF_AsFDFx_b8NH6AbWcRo5cj2TLwICBE-2P1g.css?delta=1&language=en&theme=ucsb&include=eJxtkOFuwyAMhF-IhUdCBkziFjDDJm3ffiRTNVXLDw7pvjM6AyKojuoNg3K3QWQJXArWgFPUwBWvOwdQ4nqFU8bnlb9xwQYrXrGWHle2KKTkWudE-XJuZwoo7nuwophwx0gTuRHE-6HK1f5eX6Kv-cJHgOYe9pA35Mzd89NGTDCyTqOjjX00yAvc4GkiraSQ3bvIPj-I-8tCLFRNgw5rh7bJe-jPWUZtw2eSDaORlygW60HQHEXsIWcJquvpuLVTdG1jZUczK7YA1Y_IA72dJ3FVMTvhQ-ypS-E45jYn68V5ZhWdJew_5wf2Rci9 — 200 — 70.9 KiB — 33 ms — h2https://webfonts.brand.ucsb.edu/webfont.min.csswebfonts.brand.ucsb.edu/webfont.min... https://webfonts.brand.ucsb.edu/webfont.min.css — 200 — 4.3 KiB — 62 ms — h3https://www.ucsb.edu/sites/default/files/css/css_xnc2Bvc7Y6EUQBJRQkHvOGbdyr0g9123rwUpljEf3Rw.css?delta=3&language=en&theme=ucsb&include=eJxtkOFuwyAMhF-IhUdCBkziFjDDJm3ffiRTNVXLDw7pvjM6AyKojuoNg3K3QWQJXArWgFPUwBWvOwdQ4nqFU8bnlb9xwQYrXrGWHle2KKTkWudE-XJuZwoo7nuwophwx0gTuRHE-6HK1f5eX6Kv-cJHgOYe9pA35Mzd89NGTDCyTqOjjX00yAvc4GkiraSQ3bvIPj-I-8tCLFRNgw5rh7bJe-jPWUZtw2eSDaORlygW60HQHEXsIWcJquvpuLVTdG1jZUczK7YA1Y_IA72dJ3FVMTvhQ-ypS-E45jYn68V5ZhWdJew_5wf2Rci9www.ucsb.edu/sites/default/files/cs... https://www.ucsb.edu/sites/default/files/css/css_xnc2Bvc7Y6EUQBJRQkHvOGbdyr0g9123rwUpljEf3Rw.css?delta=3&language=en&theme=ucsb&include=eJxtkOFuwyAMhF-IhUdCBkziFjDDJm3ffiRTNVXLDw7pvjM6AyKojuoNg3K3QWQJXArWgFPUwBWvOwdQ4nqFU8bnlb9xwQYrXrGWHle2KKTkWudE-XJuZwoo7nuwophwx0gTuRHE-6HK1f5eX6Kv-cJHgOYe9pA35Mzd89NGTDCyTqOjjX00yAvc4GkiraSQ3bvIPj-I-8tCLFRNgw5rh7bJe-jPWUZtw2eSDaORlygW60HQHEXsIWcJquvpuLVTdG1jZUczK7YA1Y_IA72dJ3FVMTvhQ-ypS-E45jYn68V5ZhWdJew_5wf2Rci9 — 200 — 1013 B — 25 ms — h2https://www.ucsb.edu/sites/default/files/js/js_-RV6-MXY-Mw1TbUZ-G0qvhqHLmD6NcOziJMq7Cu-IvA.js?scope=header&delta=0&language=en&theme=ucsb&include=eJxlj-EOwiAMhF-I2UciBTvEsJWUoptPL1uUxfnnevell7SOWYsKZnBfZ7OQjXNU0xFkzvwgMZ4Ti-MFrjRiTdpBK6Q4E5yyCcwhkVUMEJqc8wXvuPzCySR8rbCJqb442GQoXmLWspMnuePaoZCvEnUdMqq_0bHymb3a_Mgy2eOrP_IGqflq8wwww.ucsb.edu/sites/default/files/js... https://www.ucsb.edu/sites/default/files/js/js_-RV6-MXY-Mw1TbUZ-G0qvhqHLmD6NcOziJMq7Cu-IvA.js?scope=header&delta=0&language=en&theme=ucsb&include=eJxlj-EOwiAMhF-I2UciBTvEsJWUoptPL1uUxfnnevell7SOWYsKZnBfZ7OQjXNU0xFkzvwgMZ4Ti-MFrjRiTdpBK6Q4E5yyCcwhkVUMEJqc8wXvuPzCySR8rbCJqb442GQoXmLWspMnuePaoZCvEnUdMqq_0bHymb3a_Mgy2eOrP_IGqflq8w — 200 — 573 B — 12 ms — h2https://www.ucsb.edu/modules/contrib/google_tag/js/gtag.js?tdtcgywww.ucsb.edu/modules/contrib/google... https://www.ucsb.edu/modules/contrib/google_tag/js/gtag.js?tdtcgy — 200 — 971 B — 22 ms — h2https://www.ucsb.edu/modules/contrib/google_tag/js/gtm.js?tdtcgywww.ucsb.edu/modules/contrib/google... https://www.ucsb.edu/modules/contrib/google_tag/js/gtm.js?tdtcgy — 200 — 852 B — 14 ms — h2https://player.vimeo.com/api/player.jsplayer.vimeo.com/api/player.js https://player.vimeo.com/api/player.js — 200 — 8.9 KiB — 42 ms — http/1.1https://ucsb.enterprise.localist.com/widget/view?schools=ucsb&days=365&num=4&tags=EDU+Feature&match=any&hidedesc=1&style=noneucsb.enterprise.localist.com/widget... https://ucsb.enterprise.localist.com/widget/view?schools=ucsb&days=365&num=4&tags=EDU+Feature&match=any&hidedesc=1&style=none — 301 — 693 B — 77 ms — h2https://www.ucsb.edu/sites/default/files/images/2022-08/campus-map-ucsb-edu.pngwww.ucsb.edu/sites/default/files/im... https://www.ucsb.edu/sites/default/files/images/2022-08/campus-map-ucsb-edu.png — 200 — 102.0 KiB — 13 ms — 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https://www.ucsb.edu/themes/ucsb/favicon.ico — 200 — 1.2 KiB — 15 ms — h2https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 23.2 KiB — 19 ms — h3https://www.youtube.com/generate_204?meHyEgwww.youtube.com/generate_204?meHyEg https://www.youtube.com/generate_204?meHyEg — 204 — 10 B — 8 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 30 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 21 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 679ms · 636KB · $9/mo
www.ucsb.edu
Other
Costly
Execution 254ms
Transfer 140 KB
Monthly Cost $3/mo
www.ucsb.edu
Other
Optional
Execution 123ms
Transfer 108 KB
Unused 62%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 99ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 94ms
Transfer 138 KB
Unused 45%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 58ms
Transfer 153 KB
Unused 42%
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 50ms
Transfer 97 KB
Unused 34%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.ucsb.edu adds 254ms 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.ucsb.edu takes 254ms 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

62% of www.ucsb.edu'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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