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https://caltech.edu

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
89
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.17 s

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

1.90 s

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

51 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.

1.17 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.

2.40 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
15
5 PASS 4 REVIEW 4 FIX
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 (1.9 MiB of 1.9 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
17 scripts, 398 KB unused
FIX
17 scripts, 398 KB unused
Warning::
https://cdnjs.cloudflare.com/ajax/libs/apexcharts/...: 117 KB unused (93%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2...: 99 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-P8H...: 66 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7RL8...: 65 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.caltech.edu/static/CACHE/js/output.250...: 27 KB unused (80%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 398 KB
398 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://cdnjs.cloudflare.com/ajax/libs/apexcharts/5.3.2/apexcharts.min.js125 KB117 KB (93%)✓3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.min.js202 KB99 KB (50%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8H9J4S132 KB66 KB (50%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-7RL83EX4D4&cx=c&gtm=4e64h1153 KB65 KB (42%)✓3rd
https://www.caltech.edu/static/CACHE/js/output.2500c9bd34d8.js34 KB27 KB (80%)✓3rd
https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js30 KB24 KB (83%)✓3rd
https://cdn.datatables.net/1.12.1/js/dataTables.bootstrap4.min.js2 KB—✓3rd
https://www.caltech.edu/static/wagtailadmin/js/icons.js?v=38cff7380 KB—✓3rd
https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.js5 KB—✗3rd
https://www.caltech.edu/static/airspace/js/jquery.mousewheel.min.js1 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
Page Weight Inventory
Action
63 resources · 1.9 MB · 398 KB savings available
FIX
63 resources · 1.9 MB · 398 KB savings available
Warning::
Page weight 895 KB over 1MB target
Got: 1.9 MB Expected: ≤ 1 MB
Info::
~398 KB of savings available
Warning::
62 third-party resources (100% of weight)
Info::
2 resources over 200KB
63 resources · 1.9 MiB · 62 third-party 895.2 KiB over 1MB target
Image 54% · 1.0 MiB
JavaScript 40% · 769.5 KiB
CSS 4% · 76.9 KiB
Document 2% · 33.8 KiB
Other 0% · 6.9 KiB

~397.5 KiB of savings available

Remove unused JavaScript: 397.5 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.

C
Page Weight Budget
Action
1.9 MB transferred, 63 requests
REVIEW
1.9 MB transferred, 63 requests
Info::
Page weighs 4.7 MB (1.9 MB transferred)
Warning::
JavaScript is 770 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 770 KB
Info::
63 HTTP requests
Info::
Estimated 0.39 g CO2 per page load
1.9 MB / 2.4 MB budget
1.9 MB transferred
63 requests
0.39 g CO2 per page load
Images 994.5 KiB 52%
JavaScript 769.5 KiB 40%
CSS 76.9 KiB 4%
Other 33.7 KiB 2%
HTML 33.5 KiB 2%
Other 6.3 KiB 0%
Other 4.7 KiB 0%
0 2.4 MB 4.9 MB
Approaching limit

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

B
Image Optimization
33 images, 0 KB saveable
REVIEW
33 images, 0 KB saveable
Info::
All images are well-optimized
33 images 995 KB
0 oversized -0 KB
28 legacy format
0 missing dimensions CLS risk
B
JS Execution Cost
664ms total JS execution
REVIEW
664ms total JS execution
Info::
https://www.caltech.edu/: 167ms CPU time
Info::
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2...: 126ms CPU time
Info::
Unattributable: 107ms CPU time
Info::
https://code.jquery.com/jquery-3.3.1.min.js: 76ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-7RL8...: 73ms CPU time
Warning::
Third-party scripts: 664ms (100% of total)

Main Thread Breakdown

Script Evaluation 47% Other 16% Style & Layout 14% Script Parsing & Compilation 14% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.caltech.edu/167ms11ms1ms3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.min.js126ms78ms43ms3rd
Unattributable107ms2ms0ms3rd
https://code.jquery.com/jquery-3.3.1.min.js76ms65ms3ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7RL83EX4D4&cx=c&gtm=4e64h173ms58ms14ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8H9J4S60ms47ms12ms3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/input/asciimath.js54ms47ms3ms3rd
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
No web fonts (system fonts)
PASS
No web fonts (system fonts)
Info::
No web fonts loaded — system fonts are fastest
No web fonts loaded — system fonts are optimal.
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 1110ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.9 shttps://caltech.edu// https://caltech.edu/ — 301 — 294 B — 188 ms — http/1.1https://www.caltech.edu/www.caltech.edu/ https://www.caltech.edu/ — 200 — 33.5 KiB — 62 ms — h2https://cdn.datatables.net/1.12.1/css/dataTables.bootstrap4.min.csscdn.datatables.net/1.12.1/css/dataT... https://cdn.datatables.net/1.12.1/css/dataTables.bootstrap4.min.css — 200 — 1.9 KiB — 52 ms — h2https://cdn.datatables.net/responsive/2.3.0/css/responsive.dataTables.min.csscdn.datatables.net/responsive/2.3.0... https://cdn.datatables.net/responsive/2.3.0/css/responsive.dataTables.min.css — 200 — 1.4 KiB — 39 ms — h2https://www.caltech.edu/static/CACHE/css/output.7e3001c3b76e.csswww.caltech.edu/static/CACHE/css/ou... https://www.caltech.edu/static/CACHE/css/output.7e3001c3b76e.css — 200 — 73.5 KiB — 60 ms — h2https://code.jquery.com/jquery-3.3.1.min.jscode.jquery.com/jquery-3.3.1.min.js https://code.jquery.com/jquery-3.3.1.min.js — 200 — 29.9 KiB — 34 ms — h2https://cdnjs.cloudflare.com/ajax/libs/apexcharts/5.3.2/apexcharts.min.jscdnjs.cloudflare.com/ajax/libs/apex... https://cdnjs.cloudflare.com/ajax/libs/apexcharts/5.3.2/apexcharts.min.js — 200 — 125.3 KiB — 62 ms — h3https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.jscdn.datatables.net/1.12.1/js/jquery... https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js — 200 — 29.5 KiB — 55 ms — h2https://cdn.datatables.net/responsive/2.3.0/js/dataTables.responsive.min.jscdn.datatables.net/responsive/2.3.0... https://cdn.datatables.net/responsive/2.3.0/js/dataTables.responsive.min.js — 200 — 6.0 KiB — 38 ms — h2https://cdn.datatables.net/1.12.1/js/dataTables.bootstrap4.min.jscdn.datatables.net/1.12.1/js/dataTa... https://cdn.datatables.net/1.12.1/js/dataTables.bootstrap4.min.js — 200 — 2.1 KiB — 40 ms — h2https://cdnjs.cloudflare.com/ajax/libs/clamp-js/0.7.0/clamp.jscdnjs.cloudflare.com/ajax/libs/clam... https://cdnjs.cloudflare.com/ajax/libs/clamp-js/0.7.0/clamp.js — 200 — 2.9 KiB — 44 ms — h3https://www.caltech.edu/static/CACHE/js/output.54b9aeca30a0.jswww.caltech.edu/static/CACHE/js/out... https://www.caltech.edu/static/CACHE/js/output.54b9aeca30a0.js — 200 — 2.8 KiB — 27 ms — h2https://www.caltech.edu/static/wagtailadmin/js/icons.js?v=38cff738www.caltech.edu/static/wagtailadmin... https://www.caltech.edu/static/wagtailadmin/js/icons.js?v=38cff738 — 200 — 463 B — 51 ms — h2https://www.caltech.edu/static/wagtail_menu/img/icon-chevron-grey-550.pngwww.caltech.edu/static/wagtail_menu... https://www.caltech.edu/static/wagtail_menu/img/icon-chevron-grey-550.png — 200 — 453 B — 52 ms — h2https://www.caltech.edu/static/wagtail_menu/img/icon-chevron-orange.pngwww.caltech.edu/static/wagtail_menu... https://www.caltech.edu/static/wagtail_menu/img/icon-chevron-orange.png — 200 — 587 B — 23 ms — h2https://www.caltech.edu/static/core/img/caltech-new-logo.pngwww.caltech.edu/static/core/img/cal... https://www.caltech.edu/static/core/img/caltech-new-logo.png — 200 — 7.6 KiB — 43 ms — h2https://www.caltech.edu/static/wagtail_menu/img/icon-search.pngwww.caltech.edu/static/wagtail_menu... https://www.caltech.edu/static/wagtail_menu/img/icon-search.png — 200 — 1.3 KiB — 19 ms — h2https://www.caltech.edu/static/wagtail_menu/img/menu-burger.pngwww.caltech.edu/static/wagtail_menu... https://www.caltech.edu/static/wagtail_menu/img/menu-burger.png — 200 — 169 B — 21 ms — h2https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.jscdnjs.cloudflare.com/ajax/libs/anch... https://cdnjs.cloudflare.com/ajax/libs/anchor-js/5.0.0/anchor.js — 200 — 4.9 KiB — 18 ms — h3https://www.caltech.edu/static/airspace/js/jquery.mousewheel.min.jswww.caltech.edu/static/airspace/js/... https://www.caltech.edu/static/airspace/js/jquery.mousewheel.min.js — 200 — 1.2 KiB — 28 ms — h2https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.min.jscdnjs.cloudflare.com/ajax/libs/math... https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.min.js — 200 — 201.6 KiB — 56 ms — h3https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.13.7/underscore-min.jscdnjs.cloudflare.com/ajax/libs/unde... https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.13.7/underscore-min.js — 200 — 7.3 KiB — 30 ms — h3https://www.caltech.edu/static/CACHE/js/output.2500c9bd34d8.jswww.caltech.edu/static/CACHE/js/out... https://www.caltech.edu/static/CACHE/js/output.2500c9bd34d8.js — 200 — 34.1 KiB — 49 ms — h2https://www.caltech.edu/static/airspace/img/icon-chevron-white-left.pngwww.caltech.edu/static/airspace/img... https://www.caltech.edu/static/airspace/img/icon-chevron-white-left.png — 200 — 1.3 KiB — 36 ms — h2https://www.caltech.edu/static/airspace/img/icon-chevron-white-right.pngwww.caltech.edu/static/airspace/img... https://www.caltech.edu/static/airspace/img/icon-chevron-white-right.png — 200 — 458 B — 35 ms — h2https://www.caltech.edu/static/airspace/img/icon-chevron-left.pngwww.caltech.edu/static/airspace/img... https://www.caltech.edu/static/airspace/img/icon-chevron-left.png — 200 — 464 B — 37 ms — h2https://www.caltech.edu/static/airspace/img/icon-chevron-right.pngwww.caltech.edu/static/airspace/img... https://www.caltech.edu/static/airspace/img/icon-chevron-right.png — 200 — 458 B — 40 ms — h2https://www.caltech.edu/static/www/img/caltech-weekly-logo.pngwww.caltech.edu/static/www/img/calt... https://www.caltech.edu/static/www/img/caltech-weekly-logo.png — 200 — 9.7 KiB — 43 ms — h2https://scontent-sea1-1.cdninstagram.com/v/t51.82787-15/671798385_18582177727012321_6958694230070571302_n.jpg?stp=dst-jpg_e35_tt6&_nc_cat=100&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiRkVFRC5iZXN0X2ltYWdlX3VybGdlbi5DMyJ9&_nc_ohc=iaDA-V0DF1EQ7kNvwEmEJW-&_nc_oc=Adq4FfSlnraxGSwtZ0CEyEYMb5MhEm0YXoZBWyxKfSlhOay8jXRAJ6PisCM9KqDjsAA&_nc_zt=23&_nc_ht=scontent-sea1-1.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=Sc4jkq7wyw7yEsBh0qW-fA&_nc_tpa=Q5bMBQHmYCPzv1UKKZWlbhLu_UjzEMxvRADotMx-yRFQ-17pUy8w0yuQlp_I8YXiZ0hBqRfqRLjdc5sLzQ&oh=00_Af3Mrb3bE9JS4th_kl4j1alpnne8jU8FCV1Mm5lSZ77WRA&oe=69ED9723scontent-sea1-1.cdninstagram.com/v/... https://scontent-sea1-1.cdninstagram.com/v/t51.82787-15/671798385_18582177727012321_6958694230070571302_n.jpg?stp=dst-jpg_e35_tt6&_nc_cat=100&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiRkVFRC5iZXN0X2ltYWdlX3VybGdlbi5DMyJ9&_nc_ohc=iaDA-V0DF1EQ7kNvwEmEJW-&_nc_oc=Adq4FfSlnraxGSwtZ0CEyEYMb5MhEm0YXoZBWyxKfSlhOay8jXRAJ6PisCM9KqDjsAA&_nc_zt=23&_nc_ht=scontent-sea1-1.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=Sc4jkq7wyw7yEsBh0qW-fA&_nc_tpa=Q5bMBQHmYCPzv1UKKZWlbhLu_UjzEMxvRADotMx-yRFQ-17pUy8w0yuQlp_I8YXiZ0hBqRfqRLjdc5sLzQ&oh=00_Af3Mrb3bE9JS4th_kl4j1alpnne8jU8FCV1Mm5lSZ77WRA&oe=69ED9723 — 200 — 217.4 KiB — 361 ms — h3https://scontent-sea1-1.cdninstagram.com/v/t51.71878-15/670311347_4253466034928050_6186471018531983105_n.jpg?stp=dst-jpg_e35_tt6&_nc_cat=106&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiQ0xJUFMuYmVzdF9pbWFnZV91cmxnZW4uQzMifQ%3D%3D&_nc_ohc=o5wjgD7hg6gQ7kNvwGO34C5&_nc_oc=AdoiUiyX__nDL22ZDdIyP3HSxjOamEYHsqpOSRkf0mfY_BnwKFN2qrcNyPz0ueCyTJA&_nc_zt=23&_nc_ht=scontent-sea1-1.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=Sc4jkq7wyw7yEsBh0qW-fA&_nc_tpa=Q5bMBQFjyJzRg5Lxxe6pOEa7ElzJrQAhubY2_Tf-NaigFfJ8NrRP8WLncgCQnnacF2_xppX4scr1lPjjMQ&oh=00_Af1J6oAf3h6WCHCCotW0nCmmChBoFBcV72K0Xwm4tvcoUg&oe=69EDB580scontent-sea1-1.cdninstagram.com/v/... https://scontent-sea1-1.cdninstagram.com/v/t51.71878-15/670311347_4253466034928050_6186471018531983105_n.jpg?stp=dst-jpg_e35_tt6&_nc_cat=106&ccb=7-5&_nc_sid=18de74&efg=eyJlZmdfdGFnIjoiQ0xJUFMuYmVzdF9pbWFnZV91cmxnZW4uQzMifQ%3D%3D&_nc_ohc=o5wjgD7hg6gQ7kNvwGO34C5&_nc_oc=AdoiUiyX__nDL22ZDdIyP3HSxjOamEYHsqpOSRkf0mfY_BnwKFN2qrcNyPz0ueCyTJA&_nc_zt=23&_nc_ht=scontent-sea1-1.cdninstagram.com&edm=ANo9K5cEAAAA&_nc_gid=Sc4jkq7wyw7yEsBh0qW-fA&_nc_tpa=Q5bMBQFjyJzRg5Lxxe6pOEa7ElzJrQAhubY2_Tf-NaigFfJ8NrRP8WLncgCQnnacF2_xppX4scr1lPjjMQ&oh=00_Af1J6oAf3h6WCHCCotW0nCmmChBoFBcV72K0Xwm4tvcoUg&oe=69EDB580 — 200 — 75.5 KiB — 287 ms — h3
0 ms 500 ms 1.0 s 1.5 s FCP 1.2 s LCP 1.9 shttps://caltech.edu// https://caltech.edu/ — 301 — 294 B — 188 ms — http/1.1https://www.caltech.edu/www.caltech.edu/ https://www.caltech.edu/ — 200 — 33.5 KiB — 62 ms — h2https://cdn.datatables.net/1.12.1/css/dataTables.bootstrap4.min.csscdn.datatables.net/1.12.1/css/dataT... https://cdn.datatables.net/1.12.1/css/dataTables.bootstrap4.min.css — 200 — 1.9 KiB — 52 ms — h2https://cdn.datatables.net/responsive/2.3.0/css/responsive.dataTables.min.csscdn.datatables.net/responsive/2.3.0... https://cdn.datatables.net/responsive/2.3.0/css/responsive.dataTables.min.css — 200 — 1.4 KiB — 39 ms — h2https://www.caltech.edu/static/CACHE/css/output.7e3001c3b76e.csswww.caltech.edu/static/CACHE/css/ou... https://www.caltech.edu/static/CACHE/css/output.7e3001c3b76e.css — 200 — 73.5 KiB — 60 ms — h2https://code.jquery.com/jquery-3.3.1.min.jscode.jquery.com/jquery-3.3.1.min.js https://code.jquery.com/jquery-3.3.1.min.js — 200 — 29.9 KiB — 34 ms — 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h2https://www.google-analytics.com/g/collect?v=2&tid=G-7RL83EX4D4&gtm=45je64h1v867489695z8831249748za20gzb831249748zd831249748&_p=1776800910125&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=2015746449.1776800911&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117512543&sid=1776800910&sct=1&seg=0&dl=https%3A%2F%2Fwww.caltech.edu%2F&dt=Home%20-%20www.caltech.edu&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1053www.google-analytics.com/g/collect?... https://www.google-analytics.com/g/collect?v=2&tid=G-7RL83EX4D4&gtm=45je64h1v867489695z8831249748za20gzb831249748zd831249748&_p=1776800910125&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=2015746449.1776800911&frm=0&pscdl=noapi&rcb=19&sr=800x600&uaa=x86&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938469~117266401~117512543&sid=1776800910&sct=1&seg=0&dl=https%3A%2F%2Fwww.caltech.edu%2F&dt=Home%20-%20www.caltech.edu&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1053 — 204 — 549 B — 36 ms — h2https://www.caltech.edu/cdn-cgi/rum?www.caltech.edu/cdn-cgi/rum? https://www.caltech.edu/cdn-cgi/rum? — 204 — 149 B — 8 ms — h2https://www.caltech.edu/static/core/img/favicon-75.png?v=7.2.6www.caltech.edu/static/core/img/fav... https://www.caltech.edu/static/core/img/favicon-75.png?v=7.2.6 — 200 — 2.8 KiB — 22 ms — h2https://www.caltech.edu/static/core/img/favicon-32.png?v=7.2.6www.caltech.edu/static/core/img/fav... https://www.caltech.edu/static/core/img/favicon-32.png?v=7.2.6 — 200 — 1.6 KiB — 15 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 664ms · 576KB · $9/mo
www.caltech.edu
Other
Optional
Execution 167ms
Transfer 34 KB
Monthly Cost $2/mo
cdnjs
CDN
Optional
Execution 126ms
Transfer 202 KB
Unused 50%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 107ms
Transfer 0 KB
Monthly Cost $1/mo
code.jquery.com
Other
Optional
Execution 76ms
Transfer 30 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 73ms
Transfer 153 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 132 KB
Unused 50%
Monthly Cost $1/mo
cdnjs
CDN
Optional
Execution 54ms
Transfer 25 KB
Monthly Cost $1/mo

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

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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