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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
4
REVIEW
3
PASS
8
INFO
2

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

Mobile Desktop
55
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
91
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

16.25 s

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

28.53 s

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

6 ms

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

0.050

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

16.25 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.

33.30 s

Page Load Progression

406 ms
812 ms
1.2 s
1.6 s
2.0 s
2.4 s
2.8 s
3.2 s
Checks
17
8 PASS 3 REVIEW 4 FIX
F
Page Weight Budget
Action
21.3 MB transferred, 99 requests
FIX
21.3 MB transferred, 99 requests
Critical::
Page weighs 23.2 MB (21.3 MB transferred)
Warning::
Images are 10.1 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.1 MB
Info::
CSS is 2.5 MB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 2.5 MB
Warning::
JavaScript is 923 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 923 KB
Info::
99 HTTP requests
Info::
Estimated 4.5 g CO2 per page load
21.3 MB / 2.4 MB budget
21.3 MB transferred
99 requests
4.5 g CO2 per page load
Images 10.1 MiB 47%
Other 7.5 MiB 35%
CSS 2.5 MiB 12%
JavaScript 923.1 KiB 4%
Fonts 151.6 KiB 1%
HTML 62.9 KiB 0%
Other 15.8 KiB 0%
Other 5.1 KiB 0%
Other 3.6 KiB 0%
Other 841 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

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

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
JS Execution Cost
Action
2942ms total JS execution
FIX
2942ms total JS execution
Warning::
Unattributable: 711ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K82...: 602ms CPU time
Warning::
https://ucsd.edu/: 593ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-176...: 226ms CPU time
Info::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 209ms CPU time
Warning::
Third-party scripts: 2349ms (80% of total)

Main Thread Breakdown

Script Evaluation 49% Other 28% Style & Layout 8% Script Parsing & Compilation 8% Rendering 4%
ScriptTotalScriptingParse/CompileParty
Unattributable711ms73ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K826VG602ms530ms59ms3rd
https://ucsd.edu/593ms54ms5ms1st
https://www.googletagmanager.com/gtag/js?id=AW-17658733768&cx=c&gtm=4e64h1226ms199ms26ms3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js209ms156ms50ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZBPHLZYTS4&cx=c&gtm=4e64h1208ms174ms32ms3rd
https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js135ms93ms8ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js134ms111ms19ms3rd
https://www.ucsd.edu/_resources/js/myscripts.js125ms81ms3ms3rd
D
JS Bundles
Action
25 scripts, 323 KB unused
FIX
25 scripts, 323 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-ZBPH...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-K82...: 59 KB unused (34%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://analytics.tiktok.com/i18n/pixel/static/mai...: 57 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-176...: 55 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://script.hotjar.com/modules.6a0f3932cb1341a3...: 38 KB unused (67%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 323 KB
323 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-ZBPHLZYTS4&cx=c&gtm=4e64h1153 KB63 KB (41%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K826VG174 KB59 KB (34%)✓3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js106 KB57 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-17658733768&cx=c&gtm=4e64h1146 KB55 KB (38%)✓3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57 KB38 KB (67%)✓3rd
https://www.ucsd.edu/_resources/bootstrap/javascripts/bootstrap.min.js36 KB30 KB (82%)✓3rd
https://www.ucsd.edu/_resources/js/myscripts.js38 KB21 KB (55%)✗3rd
https://snap.licdn.com/li.lms-analytics/insight.min.js19 KB—✓3rd
https://www.youtube.com/iframe_api4 KB—✓3rd
https://www.ucsd.edu/_resources/js/vendor/flipcards.js6 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

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: max-age=0, no-cache, no-store, must-revalidate
Info::
Last-Modified header present
Cache-Control

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

DirectiveValueMeaning
max-age0Cache for 0 seconds
no-cache—Cache but always revalidate first
no-store—Never cache this response
must-revalidate—Must recheck with server after expiry
C
Image Optimization
Action
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Warning::
https://www.ucsd.edu/_resources/img/icon_bsky.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucsd.edu/_images/homepage/img-research-mod... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/icon_tw.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/icon_linked.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/logo_UCSD_whit... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/icon_ig.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/logo_UCSD.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://today.ucsd.edu/teaser_uploads/_ucsd-feed/B... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/icon_fb.png is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.ucsd.edu/_resources/img/icon_tiktok.pn... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://today.ucsd.edu/teaser_uploads/_ucsd-feed/g... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://today.ucsd.edu/teaser_uploads/_ucsd-feed/G... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucsd.edu/_images/homepage/img-feat-us-news... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://ucsd.edu/_images/homepage/img-always-movin... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 10.1 MB
0 oversized -0 KB
33 legacy format
14 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

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

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
Page Weight Inventory
Action
99 resources · 21.3 MB · 323 KB savings available
REVIEW
99 resources · 21.3 MB · 323 KB savings available
Warning::
Page weight 20.3 MB over 1MB target
Got: 21.3 MB Expected: ≤ 1 MB
Info::
~323 KB of savings available
Info::
77 third-party resources (18% of weight)
Info::
7 resources over 200KB
99 resources · 21.3 MiB · 77 third-party 20.3 MiB over 1MB target
Image 48% · 10.1 MiB
Media 35% · 7.5 MiB
CSS 12% · 2.5 MiB
JavaScript 4% · 923.1 KiB
Font 1% · 151.6 KiB
Document 0% · 63.3 KiB
Other 0% · 9.9 KiB

~322.8 KiB of savings available

Remove unused JavaScript: 322.8 KiB
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Third-Party Impact
18% third-party, 0 ms blocking
PASS
18% third-party, 0 ms blocking
Info::
Third-party code accounts for 18% of page weight (3.9 MiB of 21.3 MiB)
Info::
Third-party blocking time is low (0 ms)
82%
18%
First-party Third-party
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
4 fonts (152 KB)
PASS
4 fonts (152 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

152 KB total

Render-blocking

0

of 4

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 16.2 s LCP 28.5 sdata:application/font-woff2;base64,d09GMgABAAAAAK6CAA4AAAACWogAAKyNAAEAAAAArOgAAAGaAAADTgAAAAAAAAAA…font-woff2;base64,d09GM... data:application/font-woff2;base64,d09GMgABAAAAAK6CAA4AAAACWogAAKyNAAEAAAAArOgAAAGaAAADTgAAAAAAAAAA… — 43.6 KiB — 21 ms — font-display: swapdata:application/font-woff2;base64,d09GMgABAAAAAKPiAA4AAAACKLQAAKHvAAEAAAAAokgAAAGaAAADSwAAAAAAAAAA…font-woff2;base64,d09GM... data:application/font-woff2;base64,d09GMgABAAAAAKPiAA4AAAACKLQAAKHvAAEAAAAAokgAAAGaAAADSwAAAAAAAAAA… — 41.0 KiB — 24 ms — font-display: swaphttps://www.ucsd.edu/_resources/fonts/refrigerator_deluxe_extrabold/font.woff2font.woff2 https://www.ucsd.edu/_resources/fonts/refrigerator_deluxe_extrabold/font.woff2 — 43.9 KiB — 726 ms — font-display: swaphttps://www.ucsd.edu/_resources/bootstrap/fonts/glyphicons-halflings-regular.woffglyphicons-halflings-re... https://www.ucsd.edu/_resources/bootstrap/fonts/glyphicons-halflings-regular.woff — 23.1 KiB — 504 ms — font-display: swap
font-woff2;base64,d09GM... woff2 swap
Size 44 KB
Load time 21 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
font-woff2;base64,d09GM... woff2 swap
Size 41 KB
Load time 24 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
font.woff2 woff2 swap
Size 44 KB
Load time 726 ms
Start 2.2 s
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff swap
Size 23 KB
Load time 504 ms
Start 2.6 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
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)

Fixing the unchecked items could save ~7 KB and ~14 ms

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
Network Waterfall
99 requests over 4379ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s 22.0 s 24.0 s 26.0 s 28.0 s FCP 16.2 s LCP 28.5 shttps://ucsd.edu// https://ucsd.edu/ — 200 — 62.6 KiB — 467 ms — h2https://www.ucsd.edu/_resources/css/vendor/brix_sans.csswww.ucsd.edu/_resources/css/vendor/... https://www.ucsd.edu/_resources/css/vendor/brix_sans.css — 200 — 2.0 MiB — 1.6 s — h2https://www.ucsd.edu/_resources/css/vendor/refrigerator_deluxe.csswww.ucsd.edu/_resources/css/vendor/... https://www.ucsd.edu/_resources/css/vendor/refrigerator_deluxe.css — 200 — 1.1 KiB — 1.1 s — h2https://www.ucsd.edu/_resources/css/styles.csswww.ucsd.edu/_resources/css/styles.... https://www.ucsd.edu/_resources/css/styles.css — 200 — 194.4 KiB — 1.2 s — h2https://ucsd.edu/_resources/css/custom-img.css/_resources/css/custom-img.css https://ucsd.edu/_resources/css/custom-img.css — 200 — 20.6 KiB — 155 ms — h2https://www.ucsd.edu/_resources/css/custom.csswww.ucsd.edu/_resources/css/custom.... https://www.ucsd.edu/_resources/css/custom.css — 200 — 188.6 KiB — 1.4 s — h2https://www.ucsd.edu/_resources/css/vendor/font-awesome.csswww.ucsd.edu/_resources/css/vendor/... https://www.ucsd.edu/_resources/css/vendor/font-awesome.css — 200 — 34.7 KiB — 1.2 s — h2https://www.ucsd.edu/_resources/css/vendor/animate.csswww.ucsd.edu/_resources/css/vendor/... https://www.ucsd.edu/_resources/css/vendor/animate.css — 200 — 70.9 KiB — 1.4 s — h2https://www.ucsd.edu/_resources/css/vendor/slick.csswww.ucsd.edu/_resources/css/vendor/... https://www.ucsd.edu/_resources/css/vendor/slick.css — 200 — 1.9 KiB — 1.1 s — h2https://www.ucsd.edu/_resources/css/vendor/slick-theme.csswww.ucsd.edu/_resources/css/vendor/... https://www.ucsd.edu/_resources/css/vendor/slick-theme.css — 200 — 3.3 KiB — 1.2 s — h2https://www.ucsd.edu/_resources/img/logo_UCSD.pngwww.ucsd.edu/_resources/img/logo_UC... https://www.ucsd.edu/_resources/img/logo_UCSD.png — 200 — 11.8 KiB — 524 ms — h2https://www.ucsd.edu/_resources/img/icon_search.pngwww.ucsd.edu/_resources/img/icon_se... https://www.ucsd.edu/_resources/img/icon_search.png — 200 — 1.6 KiB — 524 ms — h2https://www.ucsd.edu/_resources/css/modules/uikit-cards.csswww.ucsd.edu/_resources/css/modules... https://www.ucsd.edu/_resources/css/modules/uikit-cards.css — 200 — 3.4 KiB — 199 ms — h2https://www.ucsd.edu/_resources/img/icon_check.pngwww.ucsd.edu/_resources/img/icon_ch... https://www.ucsd.edu/_resources/img/icon_check.png — 200 — 1.2 KiB — 180 ms — h2https://ucsd.edu/_resources/js/time-converter.js/_resources/js/time-converter.js https://ucsd.edu/_resources/js/time-converter.js — 200 — 957 B — 155 ms — h2https://hello.myfonts.net/count/31ba49hello.myfonts.net/count/31ba49 https://hello.myfonts.net/count/31ba49 — 200 — 371 B — 101 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js — 200 — 33.3 KiB — 118 ms — h2https://www.ucsd.edu/_resources/bootstrap/javascripts/bootstrap.min.jswww.ucsd.edu/_resources/bootstrap/j... https://www.ucsd.edu/_resources/bootstrap/javascripts/bootstrap.min.js — 200 — 36.5 KiB — 184 ms — h2https://www.ucsd.edu/_resources/js/vendor/slick.min.jswww.ucsd.edu/_resources/js/vendor/s... https://www.ucsd.edu/_resources/js/vendor/slick.min.js — 200 — 41.2 KiB — 193 ms — h2https://www.ucsd.edu/_resources/js/vendor/responsive-tabs.jswww.ucsd.edu/_resources/js/vendor/r... https://www.ucsd.edu/_resources/js/vendor/responsive-tabs.js — 200 — 5.7 KiB — 186 ms — h2https://www.ucsd.edu/_resources/js/vendor/jquery.easings.min.jswww.ucsd.edu/_resources/js/vendor/j... https://www.ucsd.edu/_resources/js/vendor/jquery.easings.min.js — 200 — 12.9 KiB — 185 ms — h2https://www.ucsd.edu/_resources/js/myscripts.jswww.ucsd.edu/_resources/js/myscript... https://www.ucsd.edu/_resources/js/myscripts.js — 200 — 37.6 KiB — 190 ms — 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h3https://www.google.es/pagead/1p-conversion/17658733768/?random=2071088378&cv=11&fst=1776798566672&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64h1v9232920142z872288944za20gzb72288944zd72288944xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938468~117266400~117884344&u_w=412&u_h=823&url=https%3A%2F%2Fucsd.edu%2F&rcb=16&label=557uCIf5z7AbEMjJq-RB&capi=1&frm=0&tiba=University%20of%20California%20San%20Diego&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=1676367316.1776798566&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKFHRyaWdnZXI7ZXZlbnQtc291cmNlWgMKAQFiAwoBAw&cerd=CgEA&fsk=ChAI8MCczwYQ5M2swJGnz8hdEiwA-P8T6WWZ4EQSe1jFWJ4oh_4dJWitR-ir0bmuTB4IiuSdgCyldZtFcUU74BoCRCs&is_vtc=1&cid=CAQSWwAFq6B9D9mdK8Ct-iXaWoYML65tl3MVsqvy-5IqsfreDN5o4UgiwDzQaTPHDn_Df8JdaQD9XCAj-C0iyjyP3hd3uuRQd62F4_BmZG2HNw1fjZKlP-3JwBUZl0Q&eitems=ChAI8MCczwYQjZ-Zw_S9ooFIEh0A8qyDxX2p60NMX9QyvD1OVVg2x8qVxvzZhRjgMw&random=1892140023&ipr=y&pscrd=IhMI0rqiu9L_kwMV_V_2CB0k-DtrMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOhFodHRwczovL3Vjc2QuZWR1L0JWQ2hBSThNQ2N6d1lRb09lNTdPdlZucm9lRWl3QXR0dm4wVXlnTFYzM1lKRzY4ZVJrcVdEa2JKNDA0QnhoYUdGY2VMRk1lOFRrcW4wNnhIMzV5X3haNnd6DAgJYggIABAAGAAgAAwww.google.es/pagead/1p-conversion/... https://www.google.es/pagead/1p-conversion/17658733768/?random=2071088378&cv=11&fst=1776798566672&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64h1v9232920142z872288944za20gzb72288944zd72288944xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938468~117266400~117884344&u_w=412&u_h=823&url=https%3A%2F%2Fucsd.edu%2F&rcb=16&label=557uCIf5z7AbEMjJq-RB&capi=1&frm=0&tiba=University%20of%20California%20San%20Diego&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=1676367316.1776798566&uaa=&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=1&uam=moto%20g%20power%20(2022)&uap=Android&uapv=11.0&uaw=0&ec_mode=a&_tu=CA&gcl_ctr=1~0~0~0&category=acrcp_v1_512&em=tv.1&fmt=8&ct_cookie_present=false&crd=CLTesQII8t-xAgit4bECCKG4sQIIscGxAgiwwbECCLHDsQIIisWxAgjCybECCLTGsQIIk9qxAgjb3LECCIfbsQII08WxAgjrzLECCO3OsQII1c-xAgj02rECCJfUsQIIyduxAgix4bECCLPhsQIIpt2xAgiw3rECCIDbsQJKFHRyaWdnZXI7ZXZlbnQtc291cmNlWgMKAQFiAwoBAw&cerd=CgEA&fsk=ChAI8MCczwYQ5M2swJGnz8hdEiwA-P8T6WWZ4EQSe1jFWJ4oh_4dJWitR-ir0bmuTB4IiuSdgCyldZtFcUU74BoCRCs&is_vtc=1&cid=CAQSWwAFq6B9D9mdK8Ct-iXaWoYML65tl3MVsqvy-5IqsfreDN5o4UgiwDzQaTPHDn_Df8JdaQD9XCAj-C0iyjyP3hd3uuRQd62F4_BmZG2HNw1fjZKlP-3JwBUZl0Q&eitems=ChAI8MCczwYQjZ-Zw_S9ooFIEh0A8qyDxX2p60NMX9QyvD1OVVg2x8qVxvzZhRjgMw&random=1892140023&ipr=y&pscrd=IhMI0rqiu9L_kwMV_V_2CB0k-DtrMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOhFodHRwczovL3Vjc2QuZWR1L0JWQ2hBSThNQ2N6d1lRb09lNTdPdlZucm9lRWl3QXR0dm4wVXlnTFYzM1lKRzY4ZVJrcVdEa2JKNDA0QnhoYUdGY2VMRk1lOFRrcW4wNnhIMzV5X3haNnd6DAgJYggIABAAGAAgAA — 200 — 405 B — 101 ms — h2https://today.ucsd.edu/teaser_uploads/_ucsd-feed/Birch_Aquarium_-_Imagine_Wild_2026-109_-_1200x628.jpgtoday.ucsd.edu/teaser_uploads/_ucsd... https://today.ucsd.edu/teaser_uploads/_ucsd-feed/Birch_Aquarium_-_Imagine_Wild_2026-109_-_1200x628.jpg — 200 — 85.8 KiB — 1.0 s — h2https://today.ucsd.edu/teaser_uploads/_ucsd-feed/Glass-Center-Teaser.jpgtoday.ucsd.edu/teaser_uploads/_ucsd... https://today.ucsd.edu/teaser_uploads/_ucsd-feed/Glass-Center-Teaser.jpg — 200 — 54.0 KiB — 874 ms — h2https://today.ucsd.edu/teaser_uploads/_ucsd-feed/grad-slam-postdoc-teaser.jpegtoday.ucsd.edu/teaser_uploads/_ucsd... https://today.ucsd.edu/teaser_uploads/_ucsd-feed/grad-slam-postdoc-teaser.jpeg — 200 — 60.5 KiB — 1.0 s — h2https://ucsd.edu/_resources/vid/you-belong-here-cut.mov/_resources/vid/you-belong-here-cut... https://ucsd.edu/_resources/vid/you-belong-here-cut.mov — -1 — 0 B — 1 ms — https://ucsd.edu/_resources/vid/you-belong-here-cut.mov/_resources/vid/you-belong-here-cut... https://ucsd.edu/_resources/vid/you-belong-here-cut.mov — 206 — 14.6 KiB — 199 ms — h2https://analytics.tiktok.com/api/v2/pixel/actanalytics.tiktok.com/api/v2/pixel/a... https://analytics.tiktok.com/api/v2/pixel/act — 200 — 902 B — 187 ms — h2https://px.ads.linkedin.com/wa/?medium=fetch&fmt=gpx.ads.linkedin.com/wa/?medium=fetc... https://px.ads.linkedin.com/wa/?medium=fetch&fmt=g — 204 — 585 B — 153 ms — h2https://ucsd.edu/_resources/vid/you-belong-here-cut.mov/_resources/vid/you-belong-here-cut... https://ucsd.edu/_resources/vid/you-belong-here-cut.mov — 206 — 7.5 MiB — 0 ms — h2https://ucsd.edu/favicon.ico/favicon.ico https://ucsd.edu/favicon.ico — 200 — 14.9 KiB — 155 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
80% of JavaScript execution is third-party
First-party Third-party 2349ms · 707KB · $31/mo
Unattributable
Other
Costly
Execution 711ms
Transfer 0 KB
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 602ms
Transfer 174 KB
Unused 34%
Monthly Cost $8/mo
Google Tag Manager
Tag Manager
Costly
Execution 226ms
Transfer 146 KB
Unused 38%
Monthly Cost $3/mo
analytics.tiktok.com
Other
Costly
Execution 209ms
Transfer 106 KB
Unused 54%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 208ms
Transfer 153 KB
Unused 41%
Monthly Cost $3/mo
ajax.googleapis.com
Other
Optional
Execution 135ms
Transfer 33 KB
Monthly Cost $2/mo
Hotjar
Session Replay
Optional
Execution 134ms
Transfer 57 KB
Unused 67%
Monthly Cost $2/mo
www.ucsd.edu
Other
Optional
Execution 125ms
Transfer 38 KB
Unused 55%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • Unattributable adds 711ms and costs ~$9/month
  • Google Tag Manager adds 602ms and costs ~$8/month
  • Google Tag Manager adds 226ms and costs ~$3/month
  • analytics.tiktok.com adds 209ms and costs ~$3/month
  • Google Tag Manager adds 208ms and costs ~$3/month

80% 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

Unattributable takes 711ms 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 602ms 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 226ms 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

analytics.tiktok.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

54% of analytics.tiktok.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

Google Tag Manager takes 208ms 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

67% of Hotjar'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

55% of www.ucsd.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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