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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
72
GRADE
C
FIX
5
REVIEW
2
PASS
8
INFO
2

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

Mobile Desktop
31
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
58
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
83
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.

13.66 s

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

53.48 s

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

1.21 s

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.

13.68 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.

56.48 s

Page Load Progression

425 ms
850 ms
1.3 s
1.7 s
2.1 s
2.6 s
3.0 s
3.4 s
Checks
17
8 PASS 2 REVIEW 5 FIX
F
Page Weight Budget
Action
15.7 MB transferred, 135 requests
FIX
15.7 MB transferred, 135 requests
Critical::
Page weighs 24.9 MB (15.7 MB transferred)
Warning::
Images are 13.3 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 13.3 MB
Warning::
JavaScript is 1.5 MB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 1.5 MB
Info::
Fonts are 603 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 603 KB
Info::
CSS is 224 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 224 KB
Warning::
135 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 3.3 g CO2 per page load
15.7 MB / 2.4 MB budget
15.7 MB transferred
135 requests
3.3 g CO2 per page load
Images 13.3 MiB 84%
JavaScript 1.5 MiB 9%
Fonts 602.9 KiB 4%
CSS 223.9 KiB 1%
HTML 155.3 KiB 1%
Other 4.4 KiB 0%
Other 3.0 KiB 0%
Other 1.6 KiB 0%
Other 559 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

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

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

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

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 (15.7 MiB of 15.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
6248ms total JS execution
FIX
6248ms total JS execution
Warning::
https://www.columbia.edu/content/sites/www.columbi...: 2573ms CPU time
Warning::
Unattributable: 1095ms CPU time
Warning::
https://www.columbia.edu/: 686ms CPU time
Warning::
https://www.columbia.edu/content/sites/www.columbi...: 489ms CPU time
Warning::
https://www.columbia.edu/cdn-cgi/challenge-platfor...: 386ms CPU time
Warning::
Third-party scripts: 6248ms (100% of total)

Main Thread Breakdown

Script Evaluation 49% Other 20% Style & Layout 12% Parse HTML & CSS 7% Script Parsing & Compilation 6% Garbage Collection 4%
ScriptTotalScriptingParse/CompileParty
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_-VfW5OTnd-614WcPt0EhMj80XeH_mO_fMqAs2ygFCfE.js?qs=9a87463107391083ae41a44cdd03a3742573ms1747ms12ms3rd
Unattributable1095ms115ms0ms3rd
https://www.columbia.edu/686ms82ms27ms3rd
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_iBsAvH-N2woJFVjmYPshSnQtRNgBdHjpEEZSo-7-tf4.js?qs=aca78062e4b4e688f8c9675aa5f2f24b489ms102ms34ms3rd
https://www.columbia.edu/cdn-cgi/challenge-platform/scripts/jsd/main.js386ms372ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=UA-18290390-1257ms193ms40ms3rd
https://www.googletagmanager.com/gtag/js?id=G-09H1KYXPLX&cx=c&gtm=4e64k0h2247ms189ms56ms3rd
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_NDpNdspfAthpa2cWemm86171HkiPGGIngLjnzYTxBmw.js?qs=168d8d191de5b5bf20f9320b672d955e138ms41ms54ms3rd
https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.43/moment-timezone-with-data.min.js129ms40ms88ms3rd
https://code.jquery.com/ui/1.12.1/jquery-ui.min.js67ms38ms28ms3rd

Showing top 10 of 13 scripts

D
Page Weight Inventory
Action
135 resources · 15.7 MB · 297 KB savings available
FIX
135 resources · 15.7 MB · 297 KB savings available
Warning::
Page weight 14.7 MB over 1MB target
Got: 15.7 MB Expected: ≤ 1 MB
Info::
~297 KB of savings available
Warning::
134 third-party resources (100% of weight)
Info::
22 resources over 200KB
135 resources · 15.7 MiB · 134 third-party 14.7 MiB over 1MB target
Image 84% · 13.3 MiB
JavaScript 9% · 1.5 MiB
Font 4% · 602.9 KiB
CSS 1% · 223.9 KiB
Document 1% · 157.5 KiB
Other 0% · 4.2 KiB

~296.9 KiB of savings available

Remove unused JavaScript: 296.9 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.

B
Image Optimization
56 images, 0 KB saveable
REVIEW
56 images, 0 KB saveable
Info::
All images are well-optimized
56 images 13.3 MB
0 oversized -0 KB
55 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
27 scripts, 297 KB unused
REVIEW
27 scripts, 297 KB unused
Warning::
https://www.columbia.edu/content/sites/www.columbi...: 73 KB unused (54%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-09H1...: 64 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=UA-182...: 63 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://code.jquery.com/ui/1.12.1/jquery-ui.min.js: 59 KB unused (89%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.columbia.edu/content/sites/www.columbi...: 38 KB unused (61%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 297 KB
297 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_NDpNdspfAthpa2cWemm86171HkiPGGIngLjnzYTxBmw.js?qs=168d8d191de5b5bf20f9320b672d955e134 KB73 KB (54%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-09H1KYXPLX&cx=c&gtm=4e64k0h2158 KB64 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=UA-18290390-1116 KB63 KB (55%)✓3rd
https://code.jquery.com/ui/1.12.1/jquery-ui.min.js67 KB59 KB (89%)✓3rd
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_iBsAvH-N2woJFVjmYPshSnQtRNgBdHjpEEZSo-7-tf4.js?qs=aca78062e4b4e688f8c9675aa5f2f24b64 KB38 KB (61%)✓3rd
https://player.vimeo.com/api/player.js9 KB—✓3rd
https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=root,base193 KB—✓3rd
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_I-A3z7rZtEmcBCAxusPQUol24M3Ki6FwNQuIsUD8JNM.js?qs=e5d66f579508b6cf35d24ea5f38c9ed528 KB—✓3rd
https://www.columbia.edu/content/sites/www.columbia.edu.content/files/js/js_QB5AaDGtiMu0b6tu1gTogmvM6vnUE7jDKCBZuzPWkqo.js?qs=cad13804c17162889b2e4b2d7fe291704 KB—✓3rd
https://www.columbia.edu/cdn-cgi/scripts/5c5dd728/cloudflare-static/email-decode.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

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
15 fonts (603 KB)
PASS
15 fonts (603 KB)
Info::
15 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

15

603 KB total

Render-blocking

0

of 15

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 30.0 s 32.0 s 34.0 s 36.0 s 38.0 s 40.0 s 42.0 s 44.0 s 46.0 s 48.0 s 50.0 s 52.0 s 54.0 s 56.0 s FCP 13.7 s LCP 53.5 shttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 33.9 KiB — 32 ms — font-display: swaphttps://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n4&v=3l https://use.typekit.net/af/efe4a5/00000000000000007735e609/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n4&v=3 — 55.7 KiB — 40 ms — font-display: swaphttps://use.typekit.net/af/6799c3/000000000000000000012e92/27/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n4&v=3l https://use.typekit.net/af/6799c3/000000000000000000012e92/27/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n4&v=3 — 31.0 KiB — 42 ms — font-display: swaphttps://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n5&v=3l https://use.typekit.net/af/23e139/00000000000000007735e605/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n5&v=3 — 55.9 KiB — 56 ms — font-display: swaphttps://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n6&v=3l https://use.typekit.net/af/78aca8/00000000000000007735e60d/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n6&v=3 — 55.4 KiB — 45 ms — font-display: swaphttps://www.columbia.edu/content/libraries/custom/font-awesome/fonts/fontawesome-webfont.woff2?v=4.7.0fontawesome-webfont.woff2 https://www.columbia.edu/content/libraries/custom/font-awesome/fonts/fontawesome-webfont.woff2?v=4.7.0 — 76.0 KiB — 90 ms — font-display: swaphttps://www.columbia.edu/content/libraries/custom/ss-social-regular/webfonts/ss-social-regular.woffss-social-regular.woff https://www.columbia.edu/content/libraries/custom/ss-social-regular/webfonts/ss-social-regular.woff — 19.6 KiB — 90 ms — font-display: swaphttps://www.columbia.edu/content/themes/custom/columbia/assets/fonts/x-com.ttfx-com.ttf https://www.columbia.edu/content/themes/custom/columbia/assets/fonts/x-com.ttf — 1.4 KiB — 90 ms — font-display: swaphttps://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n7&v=3l https://use.typekit.net/af/2555e1/00000000000000007735e603/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n7&v=3 — 57.0 KiB — 62 ms — font-display: swaphttps://use.typekit.net/af/1be3c2/00000000000000007735e606/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n3&v=3l https://use.typekit.net/af/1be3c2/00000000000000007735e606/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n3&v=3 — 55.1 KiB — 48 ms — font-display: swaphttps://use.typekit.net/af/154cda/00000000000000007735e601/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n1&v=3l https://use.typekit.net/af/154cda/00000000000000007735e601/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=n1&v=3 — 52.4 KiB — 10 ms — font-display: swaphttps://use.typekit.net/af/3322cc/00000000000000007735e616/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i4&v=3l https://use.typekit.net/af/3322cc/00000000000000007735e616/30/l?primer=fff1a989570eb474b8c22c57cc7199e63bfc7e911b750165d0199218f0b7e7cc&fvd=i4&v=3 — 57.3 KiB — 18 ms — font-display: swaphttps://use.typekit.net/af/5cace6/00000000000000003b9b00c2/27/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=i4&v=3l https://use.typekit.net/af/5cace6/00000000000000003b9b00c2/27/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=i4&v=3 — 25.7 KiB — 22 ms — font-display: swaphttps://use.typekit.net/af/2011b6/00000000000000003b9b00c1/27/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n4&v=3l https://use.typekit.net/af/2011b6/00000000000000003b9b00c1/27/l?primer=7fa3915bdafdf03041871920a205bef951d72bf64dd4c4460fb992e3ecc3a862&fvd=n4&v=3 — 26.4 KiB — 25 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2KFO7CnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2 — 0 B — 0 ms — font-display: swap
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 34 KB
Load time 32 ms
Start 460 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 56 KB
Load time 40 ms
Start 503 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 31 KB
Load time 42 ms
Start 505 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 56 KB
Load time 56 ms
Start 505 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 55 KB
Load time 45 ms
Start 506 ms
Risk FOUT — text flashes from fallback to web font
fontawesome-webfont.woff2 woff2 swap
Size 76 KB
Load time 90 ms
Start 506 ms
Risk FOUT — text flashes from fallback to web font
ss-social-regular.woff woff swap
Size 20 KB
Load time 90 ms
Start 507 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
x-com.ttf ttf swap
Size 1 KB
Load time 90 ms
Start 507 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
l woff2 swap
Size 57 KB
Load time 62 ms
Start 508 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 55 KB
Load time 48 ms
Start 509 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 52 KB
Load time 10 ms
Start 638 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 57 KB
Load time 18 ms
Start 639 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 22 ms
Start 639 ms
Risk FOUT — text flashes from fallback to web font
l woff2 swap
Size 26 KB
Load time 25 ms
Start 640 ms
Risk FOUT — text flashes from fallback to web font
KFO7CnqEu92Fr1ME7kSn66a... woff2 swap
Size 0 KB
Load time 0 ms
Start 1.3 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 ~6 KB and ~12 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+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Network Waterfall
135 requests over 4557ms
INFO
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https://analytics.google.com/g/collect?v=2&tid=G-09H1KYXPLX&gtm=45je64k0h2v9104691888za200&_p=1776797404350&_gaz=1&gcd=13l3l3l3l3l1&npa=1&dma=0&gdid=dMDhkMT&ecid=1646513274&_eu=AAAAAGA&are=1&cid=491833179.1776797406&ec_mode=a&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&gaf=2&_s=1&tag_exp=0~115938466~115938469~117266400~117384406&sid=1776797405&sct=1&seg=0&dl=https%3A%2F%2Fwww.columbia.edu%2F&dt=Columbia%20University%20in%20the%20City%20of%20New%20York&en=page_view&_fv=1&_ss=1&_ee=1&ep.page_placeholder=PLACEHOLDER_page_location&tfd=1493 — 204 — 550 B — 38 ms — h2https://stats.g.doubleclick.net/g/collect?v=2&tid=G-09H1KYXPLX&cid=491833179.1776797406&gtm=45je64k0h2v9104691888za200&rcb=15&aip=1&dma=0&gcd=13l3l3l3l3l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400~117384406stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-09H1KYXPLX&cid=491833179.1776797406&gtm=45je64k0h2v9104691888za200&rcb=15&aip=1&dma=0&gcd=13l3l3l3l3l1&npa=1&frm=0&tag_exp=0~115938466~115938469~117266400~117384406 — 204 — 559 B — 39 ms — h2https://googleads.g.doubleclick.net/pagead/idgoogleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id — 302 — 23 B — 138 ms — h3https://static.doubleclick.net/instream/ad_status.jsstatic.doubleclick.net/instream/ad_... https://static.doubleclick.net/instream/ad_status.js — 200 — 0 B — 1 ms — h2https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drbwww.youtube.com/s/_/ytembeds/_/js/k... https://www.youtube.com/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021.O/am=AAAABA/d=1/exm=base,root/ed=1/br=1/rs=AGKMywGc21Bc99sDrhbnjOkQlq7nTfp_WQ/m=r78Drb — 200 — 0 B — 1 ms — h3https://googleads.g.doubleclick.net/pagead/id?slf_rd=1googleads.g.doubleclick.net/pagead/... https://googleads.g.doubleclick.net/pagead/id?slf_rd=1 — 200 — 146 B — 19 ms — h3https://i.ytimg.com/vi_webp/6gjLTck1gLY/sddefault.webpi.ytimg.com/vi_webp/6gjLTck1gLY/sdd... https://i.ytimg.com/vi_webp/6gjLTck1gLY/sddefault.webp — 200 — 0 B — 2 ms — h2https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svgwww.gstatic.com/youtube/img/icons/m... https://www.gstatic.com/youtube/img/icons/mweb/youtube_fill/logo/v2/67px.svg — 200 — 0 B — 1 ms — h2https://www.columbia.edu/content/themes/custom/columbia/favicon-crown.pngwww.columbia.edu/content/themes/cus... https://www.columbia.edu/content/themes/custom/columbia/favicon-crown.png — 200 — 2.1 KiB — 15 ms — h2https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 28 ms — h3https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.jswww.google.com/js/th/qKGyavTtqsN8WE... https://www.google.com/js/th/qKGyavTtqsN8WEgkipKf66gOrjuRyzmwbl6TXabwSno.js — 200 — 23.2 KiB — 20 ms — h3https://www.youtube.com/generate_204?5-VUCwwww.youtube.com/generate_204?5-VUCw https://www.youtube.com/generate_204?5-VUCw — 204 — 10 B — 6 ms — h3https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 0 B — 46 ms — h2https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateITjnn-pa.googleapis.com/$rpc/google.i... https://jnn-pa.googleapis.com/$rpc/google.internal.waa.v1.Waa/GenerateIT — 200 — 312 B — 22 ms — h2https://www.youtube.com/youtubei/v1/log_event?alt=jsonwww.youtube.com/youtubei/v1/log_eve... https://www.youtube.com/youtubei/v1/log_event?alt=json — 200 — 50 B — 23 ms — h3
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 6248ms · 756KB · $83/mo
www.columbia.edu
Other
Costly
Execution 2573ms
Transfer 32 KB
Monthly Cost $34/mo
Unattributable
Other
Costly
Execution 1095ms
Transfer 0 KB
Monthly Cost $15/mo
www.columbia.edu
Other
Costly
Execution 686ms
Transfer 44 KB
Monthly Cost $9/mo
www.columbia.edu
Other
Costly
Execution 489ms
Transfer 64 KB
Unused 61%
Monthly Cost $6/mo
www.columbia.edu
Other
Costly
Execution 386ms
Transfer 0 KB
Monthly Cost $5/mo
Google Tag Manager
Tag Manager
Costly
Execution 257ms
Transfer 116 KB
Unused 55%
Monthly Cost $3/mo
Google Tag Manager
Tag Manager
Costly
Execution 247ms
Transfer 158 KB
Unused 40%
Monthly Cost $3/mo
www.columbia.edu
Other
Optional
Execution 138ms
Transfer 134 KB
Unused 54%
Monthly Cost $2/mo
cdnjs
CDN
Optional
Execution 129ms
Transfer 26 KB
Monthly Cost $2/mo
code.jquery.com
Other
Optional
Execution 67ms
Transfer 67 KB
Unused 89%
Monthly Cost $1/mo
www.columbia.edu
Other
Optional
Execution 64ms
Transfer 67 KB
Monthly Cost $1/mo
Google Analytics
Analytics
Optional
Execution 64ms
Transfer 21 KB
Monthly Cost $1/mo
www.columbia.edu
Other
Optional
Execution 55ms
Transfer 28 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.columbia.edu adds 2573ms and costs ~$34/month
  • Unattributable adds 1095ms and costs ~$15/month
  • www.columbia.edu adds 686ms and costs ~$9/month
  • www.columbia.edu adds 489ms and costs ~$6/month
  • www.columbia.edu adds 386ms and costs ~$5/month
  • Google Tag Manager adds 257ms and costs ~$3/month
  • Google Tag Manager adds 247ms 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.columbia.edu takes 2573ms 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 1095ms 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

www.columbia.edu takes 686ms 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

www.columbia.edu takes 489ms 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

61% of www.columbia.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

www.columbia.edu takes 386ms 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 257ms 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

55% of Google Tag Manager'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 247ms 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 www.columbia.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

89% of code.jquery.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

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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