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https://caltech.edu

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

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

Mobile Desktop
53
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
86
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
92
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.

4.28 s

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

5.35 s

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

656 ms

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

0.034

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

4.28 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.

11.44 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
7 PASS 3 REVIEW 5 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 (1.8 MiB of 1.8 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2985ms total JS execution
FIX
2985ms total JS execution
Warning::
https://www.caltech.edu/: 661ms CPU time
Warning::
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2...: 553ms CPU time
Warning::
Unattributable: 441ms CPU time
Warning::
https://code.jquery.com/jquery-3.3.1.min.js: 345ms CPU time
Warning::
https://www.googletagmanager.com/gtag/js?id=G-7RL8...: 296ms CPU time
Warning::
Third-party scripts: 2985ms (100% of total)

Main Thread Breakdown

Script Evaluation 48% Other 18% Script Parsing & Compilation 13% Style & Layout 12% Parse HTML & CSS 5%
ScriptTotalScriptingParse/CompileParty
https://www.caltech.edu/661ms57ms5ms3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/tex-mml-chtml.min.js553ms361ms156ms3rd
Unattributable441ms8ms0ms3rd
https://code.jquery.com/jquery-3.3.1.min.js345ms262ms10ms3rd
https://www.googletagmanager.com/gtag/js?id=G-7RL83EX4D4&cx=c&gtm=4e64h1296ms236ms58ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-P8H9J4S242ms182ms49ms3rd
https://cdnjs.cloudflare.com/ajax/libs/mathjax/3.2.2/es5/input/asciimath.js214ms188ms13ms3rd
https://cdnjs.cloudflare.com/ajax/libs/apexcharts/5.3.2/apexcharts.min.js131ms38ms68ms3rd
https://cdn.datatables.net/1.12.1/js/jquery.dataTables.min.js102ms91ms11ms3rd
D
JS Bundles
Action
17 scripts, 397 KB unused
FIX
17 scripts, 397 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 (79%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 397 KB
397 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 (79%)✓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=38cff7381 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
56 resources · 1.8 MB · 397 KB savings available
FIX
56 resources · 1.8 MB · 397 KB savings available
Warning::
Page weight 799 KB over 1MB target
Got: 1.8 MB Expected: ≤ 1 MB
Info::
~397 KB of savings available
Warning::
55 third-party resources (100% of weight)
Info::
2 resources over 200KB
56 resources · 1.8 MiB · 55 third-party 799.3 KiB over 1MB target
Image 51% · 936.1 KiB
JavaScript 42% · 769.5 KiB
CSS 4% · 77.0 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
1.8 MB transferred, 56 requests
REVIEW
1.8 MB transferred, 56 requests
Info::
Page weighs 4.6 MB (1.8 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::
56 HTTP requests
Info::
Estimated 0.37 g CO2 per page load
1.8 MB / 2.4 MB budget
1.8 MB transferred
56 requests
0.37 g CO2 per page load
Images 898.5 KiB 49%
JavaScript 769.5 KiB 42%
CSS 77.0 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
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 899 KB
0 oversized -0 KB
25 legacy format
0 missing dimensions CLS risk
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
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
56 requests over 1154ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s FCP 4.3 s LCP 5.3 shttps://caltech.edu// https://caltech.edu/ — 301 — 294 B — 228 ms — http/1.1https://www.caltech.edu/www.caltech.edu/ https://www.caltech.edu/ — 200 — 33.5 KiB — 60 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 — 36 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 — 32 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 — 73.6 KiB — 53 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 — 37 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 — 55 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 — 39 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 — 40 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 — 51 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 — 2.7 KiB — 24 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 — 537 B — 22 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 — 36 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 — 487 B — 33 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 — 32 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 — 25 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 — 16 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 — 15 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 — 19 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 — 60 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 — 17 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 — 51 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 — 37 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 — 32 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 — 459 B — 43 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 — 33 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 — 355 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 — 75.4 KiB — 311 ms — h3
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https://www.google-analytics.com/g/collect?v=2&tid=G-7RL83EX4D4&gtm=45je64h1v867489695z8831249748za20gzb831249748zd831249748&_p=1776800887515&gcd=13l3l3l3l1l1&npa=0&dma=0&are=1&cid=139236163.1776800888&frm=0&pscdl=noapi&rcb=15&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117384406&sid=1776800888&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=1076 — 204 — 549 B — 42 ms — h2https://www.caltech.edu/cdn-cgi/rum?www.caltech.edu/cdn-cgi/rum? https://www.caltech.edu/cdn-cgi/rum? — 204 — 172 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 — 16 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 — 17 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 2985ms · 730KB · $40/mo
www.caltech.edu
Other
Costly
Execution 661ms
Transfer 34 KB
Monthly Cost $9/mo
cdnjs
CDN
Costly
Execution 553ms
Transfer 202 KB
Unused 50%
Monthly Cost $7/mo
Unattributable
Other
Costly
Execution 441ms
Transfer 0 KB
Monthly Cost $6/mo
code.jquery.com
Other
Costly
Execution 345ms
Transfer 30 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 296ms
Transfer 153 KB
Unused 42%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 242ms
Transfer 132 KB
Unused 50%
Monthly Cost $3/mo
cdnjs
CDN
Costly
Execution 214ms
Transfer 25 KB
Monthly Cost $3/mo
cdnjs
CDN
Optional
Execution 131ms
Transfer 125 KB
Unused 93%
Monthly Cost $2/mo
cdn.datatables.net
Other
Optional
Execution 102ms
Transfer 30 KB
Unused 83%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.caltech.edu adds 661ms and costs ~$9/month
  • cdnjs adds 553ms and costs ~$7/month
  • Unattributable adds 441ms and costs ~$6/month
  • code.jquery.com adds 345ms and costs ~$5/month
  • Google Tag Manager adds 296ms and costs ~$4/month
  • Google Tag Manager adds 242ms and costs ~$3/month
  • cdnjs adds 214ms 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.caltech.edu takes 661ms 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

cdnjs takes 553ms 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 441ms 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

code.jquery.com takes 345ms 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 296ms 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 242ms 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

cdnjs takes 214ms 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

93% of cdnjs'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

83% of cdn.datatables.net'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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