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https://ucsd.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
76
GRADE
C
FIX
3
REVIEW
4
PASS
6
INFO
2

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

Mobile Desktop
56
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.
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.

4.11 s

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

6.33 s

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

54 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.

6.00 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.

10.01 s

Page Load Progression

837 ms
1.7 s
2.5 s
3.3 s
4.2 s
5.0 s
5.9 s
6.7 s
Checks
15
6 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
25.1 MB transferred, 100 requests
FIX
25.1 MB transferred, 100 requests
Critical::
Page weighs 25.7 MB (25.1 MB transferred)
Warning::
Images are 10.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 10.2 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::
Fonts are 222 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 222 KB
Info::
100 HTTP requests
Info::
Estimated 5.3 g CO2 per page load
25.1 MB / 2.4 MB budget
25.1 MB transferred
100 requests
5.3 g CO2 per page load
Other 11.1 MiB 44%
Images 10.2 MiB 41%
CSS 2.5 MiB 10%
JavaScript 922.8 KiB 4%
Fonts 222.1 KiB 1%
HTML 62.9 KiB 0%
Other 15.8 KiB 0%
Other 5.0 KiB 0%
Other 3.4 KiB 0%
Other 1.0 KiB 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
JS Bundles
Action
25 scripts, 322 KB unused
FIX
25 scripts, 322 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: 322 KB
322 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 KB20 KB (54%)✗3rd
https://www.youtube.com/iframe_api3 KB—✓3rd
https://pixel.byspotify.com/ping.min.js10 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://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://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://ucsd.edu/_images/homepage/img-always-movin... 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/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/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_search.pn... 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_bsky.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/icon_tw.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/g... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
33 images 10.2 MB
0 oversized -0 KB
33 legacy format
15 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

Set explicit width and height to prevent CLS.

Why this matters

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

Source: web.dev / Core Web Vitals

C
JS Execution Cost
Action
1004ms total JS execution
REVIEW
1004ms total JS execution
Warning::
https://ucsd.edu/: 359ms CPU time
Info::
Unattributable: 201ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-K82...: 187ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-ZBPH...: 70ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=AW-176...: 68ms CPU time
Warning::
Third-party scripts: 645ms (64% of total)

Main Thread Breakdown

Script Evaluation 42% Other 36% Style & Layout 9% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://ucsd.edu/359ms10ms2ms1st
Unattributable201ms9ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-K826VG187ms170ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-ZBPHLZYTS4&cx=c&gtm=4e64h170ms54ms16ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-17658733768&cx=c&gtm=4e64h168ms58ms9ms3rd
https://analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js62ms47ms14ms3rd
https://script.hotjar.com/modules.6a0f3932cb1341a35c18.js57ms46ms9ms3rd
C
Page Weight Inventory
Action
100 resources · 25.1 MB · 322 KB savings available
REVIEW
100 resources · 25.1 MB · 322 KB savings available
Warning::
Page weight 24.1 MB over 1MB target
Got: 25.1 MB Expected: ≤ 1 MB
Info::
~322 KB of savings available
Info::
79 third-party resources (16% of weight)
Info::
7 resources over 200KB
100 resources · 25.1 MiB · 79 third-party 24.1 MiB over 1MB target
Media 44% · 11.1 MiB
Image 41% · 10.2 MiB
CSS 10% · 2.5 MiB
JavaScript 4% · 922.8 KiB
Font 1% · 222.1 KiB
Document 0% · 63.3 KiB
Other 0% · 9.9 KiB

~322.1 KiB of savings available

Remove unused JavaScript: 322.1 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
16% third-party, 0 ms blocking
PASS
16% third-party, 0 ms blocking
Info::
Third-party code accounts for 16% of page weight (4.1 MiB of 25.1 MiB)
Info::
Third-party blocking time is low (0 ms)
84%
16%
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
5 fonts (222 KB)
PASS
5 fonts (222 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

222 KB total

Render-blocking

0

of 5

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 FCP 4.1 s LCP 6.3 sdata:application/font-woff2;base64,d09GMgABAAAAAK6CAA4AAAACWogAAKyNAAEAAAAArOgAAAGaAAADTgAAAAAAAAAA…font-woff2;base64,d09GM... data:application/font-woff2;base64,d09GMgABAAAAAK6CAA4AAAACWogAAKyNAAEAAAAArOgAAAGaAAADTgAAAAAAAAAA… — 43.6 KiB — 45 ms — font-display: swapdata:application/font-woff2;base64,d09GMgABAAAAAKPiAA4AAAACKLQAAKHvAAEAAAAAokgAAAGaAAADSwAAAAAAAAAA…font-woff2;base64,d09GM... data:application/font-woff2;base64,d09GMgABAAAAAKPiAA4AAAACKLQAAKHvAAEAAAAAokgAAAGaAAADSwAAAAAAAAAA… — 41.0 KiB — 47 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 — 700 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 — 872 ms — font-display: swaphttps://www.ucsd.edu/_resources/fonts/font_awesome/fontawesome-webfont.woff2?v=4.6.3fontawesome-webfont.woff2 https://www.ucsd.edu/_resources/fonts/font_awesome/fontawesome-webfont.woff2?v=4.6.3 — 70.5 KiB — 585 ms — font-display: swap
font-woff2;base64,d09GM... woff2 swap
Size 44 KB
Load time 45 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
font-woff2;base64,d09GM... woff2 swap
Size 41 KB
Load time 47 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
glyphicons-halflings-re... woff swap
Size 23 KB
Load time 700 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
font.woff2 woff2 swap
Size 44 KB
Load time 872 ms
Start 2.5 s
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 70 KB
Load time 585 ms
Start 2.8 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)

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
Network Waterfall
100 requests over 4428ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s FCP 4.1 s LCP 6.3 shttps://ucsd.edu// https://ucsd.edu/ — 200 — 62.6 KiB — 460 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 — 1.9 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 — 1.0 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 — 157 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 — 856 ms — 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 — 1.2 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 — 689 ms — 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 — 519 ms — 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 — 681 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 — 681 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 — 672 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 — 159 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 — 97 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 — 506 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 — 413 ms — h2https://hello.myfonts.net/count/31ba49hello.myfonts.net/count/31ba49 https://hello.myfonts.net/count/31ba49 — 200 — 372 B — 71 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 — 177 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 — 175 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 — 194 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 — 187 ms — h2https://www.ucsd.edu/common/_emergency-broadcast/message.jswww.ucsd.edu/common/_emergency-broa... 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https://www.google.es/pagead/1p-conversion/17658733768/?random=1403449625&cv=11&fst=1776798584755&bg=ffffff&guid=ON&async=1&en=conversion&gtm=45be64h1v9232920142z872288944za20gzb72288944zd72288944xea&gcd=13l3l3l2l1l1&dma_cps=a&dma=1&tag_exp=0~115938465~115938469~117266400&u_w=800&u_h=600&url=https%3A%2F%2Fucsd.edu%2F&rcb=12&label=557uCIf5z7AbEMjJq-RB&capi=1&frm=0&tiba=University%20of%20California%20San%20Diego&value=0&hn=www.googleadservices.com&npa=1&pscdl=noapi&auid=1506727227.1776798584&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uamb=0&uam=&uap=macOS&uapv=10.15.7&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-P8T6XLzaXnzmHDuONnbn3is1_mlUSBroybOJ0adoPp8MCMVzzNZcLdEdBoCs1k&is_vtc=1&cid=CAQSWwAFq6B9AAUgT48kIg3dI446lODiAwcR4KYQI1vRYMgvq88FjR7YwtjjU7m4Qfpy5XPPFHfL4fGE_jXQtusr5JytiL6gbqND8O63njHzimVx6umgCTEGGkijxHA&eitems=ChAI8MCczwYQjZ-Zw_S9ooFIEh0A8qyDxSggCbu4eD5zXdCPz2eQikRxvfLhkZBzVA&random=1378766344&ipr=y&pscrd=IhMIj9Lxw9L_kwMV4kL2CB2k6y1sMgwIA2IICAAQABgAIAAyDAgEYggIABAAGAAgADIMCAdiCAgAEAAYACAAMgwICGIICAAQABgAIAAyDAgJYggIABAAGAAgADIMCApiCAgAEAAYACAAMgwIAmIICAAQABgAIAAyDAgLYggIABAAGAAgADIMCBViCAgAEAAYACAAMgwIH2IICAAQABgAIAAyDAgTYggIABAAGAAgADIMCBJiCAgAEAAYACAAOhFodHRwczovL3Vjc2QuZWR1L0JWQ2hBSThNQ2N6d1lRb09lNTdPdlZucm9lRWl3QXR0dm4wWkl1YVBNd1hsTU1CZ3V5OHhXSXBpaGF1ZFdYR1ZQaDM0RGM0d2dCd0RfQUdMZWJTLTdRTUF6DAgJYggIABAAGAAgAA — 200 — 405 B — 91 ms — h2https://analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.jsanalytics.tiktok.com/i18n/pixel/sta... https://analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js — 200 — 39.6 KiB — 11 ms — h2https://analytics-ipv6.tiktokw.us/ipv6/enrich_ipv6analytics-ipv6.tiktokw.us/ipv6/enri... https://analytics-ipv6.tiktokw.us/ipv6/enrich_ipv6 — 200 — 798 B — 209 ms — h2https://analytics.tiktok.com/api/v2/pixelanalytics.tiktok.com/api/v2/pixel https://analytics.tiktok.com/api/v2/pixel — 200 — 906 B — 224 ms — h2https://analytics.tiktok.com/api/v2/pixelanalytics.tiktok.com/api/v2/pixel https://analytics.tiktok.com/api/v2/pixel — 200 — 907 B — 224 ms — h2https://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=46649&time=1776798584867&url=https%3A%2F%2Fucsd.edu%2F&e_ipv6=AQKun4umi9vo3QAAAZ2xctC2NbifTz34Pg-gIardsFi06L6iFNCvL2TPO8VJS48bqwyd-SaK5BVkpx4.ads.linkedin.com/collect?v=2&fm... https://px4.ads.linkedin.com/collect?v=2&fmt=js&pid=46649&time=1776798584867&url=https%3A%2F%2Fucsd.edu%2F&e_ipv6=AQKun4umi9vo3QAAAZ2xctC2NbifTz34Pg-gIardsFi06L6iFNCvL2TPO8VJS48bqwyd-SaK5BVk — 200 — 908 B — 205 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 — 14.6 KiB — 201 ms — h2https://analytics.tiktok.com/api/v2/pixel/actanalytics.tiktok.com/api/v2/pixel/a... https://analytics.tiktok.com/api/v2/pixel/act — 200 — 907 B — 171 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 — 426 B — 178 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 — 10.9 MiB — 0 ms — h2https://ucsd.edu/favicon.ico/favicon.ico https://ucsd.edu/favicon.ico — 200 — 14.9 KiB — 159 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
64% of JavaScript execution is third-party
First-party Third-party 645ms · 636KB · $9/mo
Unattributable
Other
Costly
Execution 201ms
Transfer 0 KB
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Optional
Execution 187ms
Transfer 174 KB
Unused 34%
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 70ms
Transfer 153 KB
Unused 41%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 146 KB
Unused 38%
Monthly Cost $1/mo
analytics.tiktok.com
Other
Optional
Execution 62ms
Transfer 106 KB
Unused 54%
Monthly Cost $1/mo
Hotjar
Session Replay
Optional
Execution 57ms
Transfer 57 KB
Unused 67%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • Unattributable adds 201ms and costs ~$3/month

64% of JavaScript execution time comes from third-party scripts.

Why this matters

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

Learn more ▾

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

Source: web.dev / HTTP Archive Web Almanac

Unattributable takes 201ms 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

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

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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