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https://universityofcalifornia.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
3
REVIEW
4
PASS
8
INFO
2

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

Mobile Desktop
61
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
98
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
100
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.

4.53 s

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

7.40 s

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

194 ms

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

0.073

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

4.53 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.

7.40 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
17
8 PASS 4 REVIEW 3 FIX
F
Page Weight Budget
Action
9.4 MB transferred, 72 requests
FIX
9.4 MB transferred, 72 requests
Critical::
Page weighs 16.8 MB (9.4 MB transferred)
Warning::
JavaScript is 1.0 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.0 MB
Info::
Fonts are 483 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 483 KB
Info::
72 HTTP requests
Info::
Estimated 2.0 g CO2 per page load
9.4 MB / 2.4 MB budget
9.4 MB transferred
72 requests
2.0 g CO2 per page load
Other 6.8 MiB 73%
JavaScript 1.0 MiB 11%
Images 724.2 KiB 8%
Fonts 483.3 KiB 5%
CSS 170.7 KiB 2%
HTML 133.1 KiB 1%
Other 1.5 KiB 0%
Other 1.4 KiB 0%
Other 893 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

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
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 (9.4 MiB of 9.4 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
72 resources · 9.4 MB · 146 KB savings available
FIX
72 resources · 9.4 MB · 146 KB savings available
Warning::
Page weight 8.4 MB over 1MB target
Got: 9.4 MB Expected: ≤ 1 MB
Info::
~146 KB of savings available
Warning::
71 third-party resources (100% of weight)
Info::
3 resources over 200KB
72 resources · 9.4 MiB · 71 third-party 8.4 MiB over 1MB target
Media 73% · 6.8 MiB
JavaScript 11% · 1.0 MiB
Image 8% · 725.0 KiB
Font 5% · 483.3 KiB
CSS 2% · 170.7 KiB
Document 1% · 133.7 KiB
Other 0% · 2.3 KiB

~146.2 KiB of savings available

Remove unused JavaScript: 146.2 KiB
B
Image Optimization
19 images, 0 KB saveable
REVIEW
19 images, 0 KB saveable
Info::
All images are well-optimized
19 images 724 KB
0 oversized -0 KB
12 legacy format
0 missing dimensions CLS risk
C
JS Execution Cost
Action
1811ms total JS execution
REVIEW
1811ms total JS execution
Warning::
https://www.universityofcalifornia.edu/: 714ms CPU time
Warning::
Unattributable: 552ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FL92...: 310ms CPU time
Info::
https://www.universityofcalifornia.edu/sites/defau...: 95ms CPU time
Info::
https://static.addtoany.com/menu/sm.25.html: 82ms CPU time
Warning::
Third-party scripts: 1811ms (100% of total)

Main Thread Breakdown

Other 47% Script Evaluation 22% Style & Layout 18% Rendering 6% Script Parsing & Compilation 4% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://www.universityofcalifornia.edu/714ms7ms2ms3rd
Unattributable552ms19ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FL92T52KS0310ms251ms52ms3rd
https://www.universityofcalifornia.edu/sites/default/files/js/js_vaPRKM6_ryQt-urLWDQJ72M_9NUZJn7ZDEQGFOJy7uA.js?scope=footer&delta=0&language=en&theme=uc&include=eJxdjUsOwjAMRC9k6uOwrJzEBIOJJcdQwukpVZEQm9HTfDRUShi1gbTDdHJrAXSh56xGhR1_eIqzW0rskJReA5PY9ImhmlXlmRrpCMkd_41vI3fes5WOFOw38it0CV6krANlD5QmAfeMVS2RHnoMlVbhIbx03HS7fQO5PEpQ95ms77ms9ms3rd
https://static.addtoany.com/menu/sm.25.html82ms0ms0ms3rd
https://www.universityofcalifornia.edu/sites/default/files/js/js_2-dxMu4uoP72Od57HMWxBAOtYAMCQrjmCsDhhazTfIE.js?scope=footer&delta=2&language=en&theme=uc&include=eJxdjUsOwjAMRC9k6uOwrJzEBIOJJcdQwukpVZEQm9HTfDRUShi1gbTDdHJrAXSh56xGhR1_eIqzW0rskJReA5PY9ImhmlXlmRrpCMkd_41vI3fes5WOFOw38it0CV6krANlD5QmAfeMVS2RHnoMlVbhIbx03HS7fQO5PEpQ57ms41ms9ms3rd
B
JS Bundles
16 scripts, 146 KB unused
REVIEW
16 scripts, 146 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FL92...: 70 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.universityofcalifornia.edu/sites/defau...: 33 KB unused (63%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.universityofcalifornia.edu/sites/defau...: 22 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://static.addtoany.com/menu/modules/core.ydpp...: 21 KB unused (82%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 146 KB
146 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-FL92T52KS0174 KB70 KB (41%)✓3rd
https://www.universityofcalifornia.edu/sites/default/files/js/js_vaPRKM6_ryQt-urLWDQJ72M_9NUZJn7ZDEQGFOJy7uA.js?scope=footer&delta=0&language=en&theme=uc&include=eJxdjUsOwjAMRC9k6uOwrJzEBIOJJcdQwukpVZEQm9HTfDRUShi1gbTDdHJrAXSh56xGhR1_eIqzW0rskJReA5PY9ImhmlXlmRrpCMkd_41vI3fes5WOFOw38it0CV6krANlD5QmAfeMVS2RHnoMlVbhIbx03HS7fQO5PEpQ53 KB33 KB (63%)✓3rd
https://www.universityofcalifornia.edu/sites/default/files/js/js_2-dxMu4uoP72Od57HMWxBAOtYAMCQrjmCsDhhazTfIE.js?scope=footer&delta=2&language=en&theme=uc&include=eJxdjUsOwjAMRC9k6uOwrJzEBIOJJcdQwukpVZEQm9HTfDRUShi1gbTDdHJrAXSh56xGhR1_eIqzW0rskJReA5PY9ImhmlXlmRrpCMkd_41vI3fes5WOFOw38it0CV6krANlD5QmAfeMVS2RHnoMlVbhIbx03HS7fQO5PEpQ30 KB22 KB (72%)✓3rd
https://static.addtoany.com/menu/modules/core.ydpp7jcu.js26 KB21 KB (82%)✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base0 KB—✓3rd
https://static.addtoany.com/menu/page.js2 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.5f0apfZzpOA.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywFg3MG1UeKh8ePjbhY_YEMv-NHjmA/m=root,base140 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js436 KB—✓3rd
https://www.universityofcalifornia.edu/themes/uc/assets/static/js/object-fit-images/dist/ofi.min.js2 KB—✓3rd
https://www.youtube.com/s/player/1bb6ee63/player_embed_es6.vflset/en_US/base.js0 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
6 fonts (483 KB)
PASS
6 fonts (483 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

483 KB total

Render-blocking

0

of 6

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 FCP 4.5 s LCP 7.4 shttps://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Kievit/KievitOffcPro-Medi.ttfKievitOffcPro-Medi.ttf https://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Kievit/KievitOffcPro-Medi.ttf — 123.6 KiB — 15 ms — font-display: swaphttps://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Kievit/KievitOffcPro-Bold.ttfKievitOffcPro-Bold.ttf https://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Kievit/KievitOffcPro-Bold.ttf — 121.8 KiB — 19 ms — font-display: swaphttps://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Kievit/KievitOffcPro-Book.ttfKievitOffcPro-Book.ttf https://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Kievit/KievitOffcPro-Book.ttf — 115.6 KiB — 20 ms — font-display: swaphttps://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Lyon/LyonText-Regular.otfLyonText-Regular.otf https://www.universityofcalifornia.edu/themes/uc/assets/static/fonts/Lyon/LyonText-Regular.otf — 88.5 KiB — 21 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 79 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 40 ms — font-display: swap
KievitOffcPro-Medi.ttf ttf swap
Size 124 KB
Load time 15 ms
Start 138 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KievitOffcPro-Bold.ttf ttf swap
Size 122 KB
Load time 19 ms
Start 139 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KievitOffcPro-Book.ttf ttf swap
Size 116 KB
Load time 20 ms
Start 139 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
LyonText-Regular.otf otf swap
Size 88 KB
Load time 21 ms
Start 139 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 79 ms
Start 458 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 40 ms
Start 503 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)

Fixing the unchecked items could save ~315 KB and ~630 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
A+
HTTP Caching
max-age=900 (15 minutes)
PASS
max-age=900 (15 minutes)
Info::
Cache-Control header is set
Got: max-age=900, public
Info::
Effective TTL: 15 minutes (max-age=900)
Info::
ETag present — enables conditional (304) responses
Info::
Last-Modified header present
Cache-Control

max-age=900, public

DirectiveValueMeaning
max-age900Cache for 15 minutes
public—Any cache may store this response
Effective TTL: 900 seconds
Network Waterfall
72 requests over 3961ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.5 s LCP 7.4 shttps://universityofcalifornia.edu// https://universityofcalifornia.edu/ — 301 — 647 B — 15 ms — h2https://www.universityofcalifornia.edu/www.universityofcalifornia.edu/ https://www.universityofcalifornia.edu/ — 200 — 17.5 KiB — 13 ms — h2https://www.googletagmanager.com/gtag/js?id=G-FL92T52KS0www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-FL92T52KS0 — 200 — 173.8 KiB — 195 ms — h2https://www.universityofcalifornia.edu/sites/default/files/css/css_BAUZmPk47IecET0nGOkwQwZltNFpV4tbfYTD4upz2cc.css?delta=0&language=en&theme=uc&include=eJxtjlFSBCEMRC-EcBw_qTD0DqxAppLgOp5edLV0q_xJvaTTSVPOxjTOQN_gL8LDHF3pLTamDAl_2FsRTgniSBUW67hiM5awqfrCHQftiBeQTUEsEI6l9P-WtRpuNSNSg1icRyaDutTo_QyJFG5ry_bIHarrgf70g_PSWLBIOrX6Drcz7w1xU4Q7Lnpet5cuL64jVwqMnpD95dNkS3IHCe1CR9GQZR7U_O_Ez3HM1KoWZPcYO9RRzemphn4POrewN07UntTOVsfuXituGr6q75xnwwdVlZGkwww.universityofcalifornia.edu/site... https://www.universityofcalifornia.edu/sites/default/files/css/css_BAUZmPk47IecET0nGOkwQwZltNFpV4tbfYTD4upz2cc.css?delta=0&language=en&theme=uc&include=eJxtjlFSBCEMRC-EcBw_qTD0DqxAppLgOp5edLV0q_xJvaTTSVPOxjTOQN_gL8LDHF3pLTamDAl_2FsRTgniSBUW67hiM5awqfrCHQftiBeQTUEsEI6l9P-WtRpuNSNSg1icRyaDutTo_QyJFG5ry_bIHarrgf70g_PSWLBIOrX6Drcz7w1xU4Q7Lnpet5cuL64jVwqMnpD95dNkS3IHCe1CR9GQZR7U_O_Ez3HM1KoWZPcYO9RRzemphn4POrewN07UntTOVsfuXituGr6q75xnwwdVlZGk — 200 — 3.1 KiB — 14 ms — h2https://www.universityofcalifornia.edu/sites/default/files/css/css_R3fvxy-CcUZ2nlZTw2rTWWj7U_5Q4yYUFalnxx1RBe4.css?delta=1&language=en&theme=uc&include=eJxtjlFSBCEMRC-EcBw_qTD0DqxAppLgOp5edLV0q_xJvaTTSVPOxjTOQN_gL8LDHF3pLTamDAl_2FsRTgniSBUW67hiM5awqfrCHQftiBeQTUEsEI6l9P-WtRpuNSNSg1icRyaDutTo_QyJFG5ry_bIHarrgf70g_PSWLBIOrX6Drcz7w1xU4Q7Lnpet5cuL64jVwqMnpD95dNkS3IHCe1CR9GQZR7U_O_Ez3HM1KoWZPcYO9RRzemphn4POrewN07UntTOVsfuXituGr6q75xnwwdVlZGkwww.universityofcalifornia.edu/site... https://www.universityofcalifornia.edu/sites/default/files/css/css_R3fvxy-CcUZ2nlZTw2rTWWj7U_5Q4yYUFalnxx1RBe4.css?delta=1&language=en&theme=uc&include=eJxtjlFSBCEMRC-EcBw_qTD0DqxAppLgOp5edLV0q_xJvaTTSVPOxjTOQN_gL8LDHF3pLTamDAl_2FsRTgniSBUW67hiM5awqfrCHQftiBeQTUEsEI6l9P-WtRpuNSNSg1icRyaDutTo_QyJFG5ry_bIHarrgf70g_PSWLBIOrX6Drcz7w1xU4Q7Lnpet5cuL64jVwqMnpD95dNkS3IHCe1CR9GQZR7U_O_Ez3HM1KoWZPcYO9RRzemphn4POrewN07UntTOVsfuXituGr6q75xnwwdVlZGk — 200 — 62.5 KiB — 20 ms — h2https://www.universityofcalifornia.edu/sites/default/files/asset_injector/css/homepage_feature_hero_hhm-847e10f6f7da79e69cdb743f4953a86e.css?tdveyowww.universityofcalifornia.edu/site... https://www.universityofcalifornia.edu/sites/default/files/asset_injector/css/homepage_feature_hero_hhm-847e10f6f7da79e69cdb743f4953a86e.css?tdveyo — 200 — 490 B — 19 ms — h2https://www.universityofcalifornia.edu/sites/default/files/css/css_IlyCf6Q6eMy0MpR1fdKGr6A9Ia_jwOGdc0bgFSaONfA.css?delta=3&language=en&theme=uc&include=eJxtjlFSBCEMRC-EcBw_qTD0DqxAppLgOp5edLV0q_xJvaTTSVPOxjTOQN_gL8LDHF3pLTamDAl_2FsRTgniSBUW67hiM5awqfrCHQftiBeQTUEsEI6l9P-WtRpuNSNSg1icRyaDutTo_QyJFG5ry_bIHarrgf70g_PSWLBIOrX6Drcz7w1xU4Q7Lnpet5cuL64jVwqMnpD95dNkS3IHCe1CR9GQZR7U_O_Ez3HM1KoWZPcYO9RRzemphn4POrewN07UntTOVsfuXituGr6q75xnwwdVlZGkwww.universityofcalifornia.edu/site... https://www.universityofcalifornia.edu/sites/default/files/css/css_IlyCf6Q6eMy0MpR1fdKGr6A9Ia_jwOGdc0bgFSaONfA.css?delta=3&language=en&theme=uc&include=eJxtjlFSBCEMRC-EcBw_qTD0DqxAppLgOp5edLV0q_xJvaTTSVPOxjTOQN_gL8LDHF3pLTamDAl_2FsRTgniSBUW67hiM5awqfrCHQftiBeQTUEsEI6l9P-WtRpuNSNSg1icRyaDutTo_QyJFG5ry_bIHarrgf70g_PSWLBIOrX6Drcz7w1xU4Q7Lnpet5cuL64jVwqMnpD95dNkS3IHCe1CR9GQZR7U_O_Ez3HM1KoWZPcYO9RRzemphn4POrewN07UntTOVsfuXituGr6q75xnwwdVlZGk — 200 — 738 B — 12 ms — 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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 1811ms · 276KB · €20/mo
www.universityofcalifornia.edu
Other
Costly
Execution 714ms
Transfer 17 KB
Monthly Cost €8/mo
Unattributable
Other
Costly
Execution 552ms
Transfer 0 KB
Monthly Cost €6/mo
Google Tag Manager
Tag Manager
Costly
Execution 310ms
Transfer 174 KB
Unused 41%
Monthly Cost €3/mo
www.universityofcalifornia.edu
Other
Optional
Execution 95ms
Transfer 53 KB
Unused 63%
Monthly Cost €1/mo
static.addtoany.com
Other
Optional
Execution 82ms
Transfer 1 KB
Monthly Cost €1/mo
www.universityofcalifornia.edu
Other
Optional
Execution 57ms
Transfer 30 KB
Unused 72%
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.universityofcalifornia.edu adds 714ms and costs ~€8/month
  • Unattributable adds 552ms and costs ~€6/month
  • Google Tag Manager adds 310ms 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.universityofcalifornia.edu takes 714ms 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 552ms 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 310ms 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

63% of www.universityofcalifornia.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

72% of www.universityofcalifornia.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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