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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
5
REVIEW
3
PASS
5
INFO
2

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

Mobile Desktop
74
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
96
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
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.

1.37 s

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

3.77 s

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

66 ms

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

0.013

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

1.64 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.

3.89 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 3 REVIEW 5 FIX
F
Page Weight Budget
Action
8.2 MB transferred, 82 requests
FIX
8.2 MB transferred, 82 requests
Critical::
Page weighs 10.6 MB (8.2 MB transferred)
Warning::
Images are 6.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 6.9 MB
Warning::
JavaScript is 762 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 762 KB
Info::
Fonts are 307 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 307 KB
Info::
82 HTTP requests
Info::
Estimated 1.7 g CO2 per page load
8.2 MB / 2.4 MB budget
8.2 MB transferred
82 requests
1.7 g CO2 per page load
Images 6.9 MiB 84%
JavaScript 761.8 KiB 9%
Fonts 306.8 KiB 4%
CSS 173.6 KiB 2%
Other 37.9 KiB 0%
HTML 19.3 KiB 0%
Other 648 B 0%
Other 637 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

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 (8.2 MiB of 8.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
6 scripts, 309 KB unused
FIX
6 scripts, 309 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-QY13...: 73 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-PCH3...: 72 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-S0MX...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KX5...: 57 KB unused (33%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.brown.edu/sites/default/files/js/js_DO...: 43 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 309 KB
309 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-QY13L4Q0C0&cx=c&gtm=4e64h1173 KB73 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-PCH3TG4K4L&cx=c&gtm=4e64h1173 KB72 KB (42%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-S0MX9K9C18&cx=c&gtm=4e64h1152 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KX5NV9175 KB57 KB (33%)✓3rd
https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM83 KB43 KB (52%)✓3rd
https://extend.vimeocdn.com/ga/2806066.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
Page Weight Inventory
Action
82 resources · 8.2 MB · 309 KB savings available
FIX
82 resources · 8.2 MB · 309 KB savings available
Warning::
Page weight 7.2 MB over 1MB target
Got: 8.2 MB Expected: ≤ 1 MB
Info::
~309 KB of savings available
Warning::
81 third-party resources (100% of weight)
Info::
12 resources over 200KB
82 resources · 8.2 MiB · 81 third-party 7.2 MiB over 1MB target
Image 85% · 7.0 MiB
JavaScript 9% · 761.8 KiB
Font 4% · 306.8 KiB
CSS 2% · 173.6 KiB
Document 0% · 19.9 KiB
Other 0% · 1.4 KiB

~309.0 KiB of savings available

Remove unused JavaScript: 309.0 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
Image Optimization
Action
52 images, 0 KB saveable
REVIEW
52 images, 0 KB saveable
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brown.edu/sites/default/files/styles/s... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
52 images 6.9 MB
0 oversized -0 KB
51 legacy format
11 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

C
JS Execution Cost
Action
1346ms total JS execution
REVIEW
1346ms total JS execution
Warning::
https://www.brown.edu/sites/default/files/js/js_DO...: 585ms CPU time
Warning::
https://www.brown.edu/: 319ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KX5...: 131ms CPU time
Info::
Unattributable: 111ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-QY13...: 69ms CPU time
Warning::
Third-party scripts: 1346ms (100% of total)

Main Thread Breakdown

Script Evaluation 35% Style & Layout 30% Other 22% Rendering 5% Script Parsing & Compilation 4%
ScriptTotalScriptingParse/CompileParty
https://www.brown.edu/sites/default/files/js/js_DOECIYZkPn1B_8vq27gBC0SjwsM3Nj_H45TcFSoooss.js?scope=footer&delta=0&language=en&theme=brown&include=eJxlyrENwCAMBMCFUBjJMggcI8NHGJT1Q5_iumP3skhHK3lhxuaXgQQQK_T4MdFB6949DVYL_PtnVD27Im8PaeIdUQyJ7QO6_STM585ms208ms6ms3rd
https://www.brown.edu/319ms4ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KX5NV9131ms101ms18ms3rd
Unattributable111ms2ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-QY13L4Q0C0&cx=c&gtm=4e64h169ms57ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-PCH3TG4K4L&cx=c&gtm=4e64h168ms55ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-S0MX9K9C18&cx=c&gtm=4e64h163ms52ms11ms3rd
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 (307 KB)
PASS
6 fonts (307 KB)
Info::
6 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

6

307 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 FCP 1.4 s LCP 3.8 shttps://use.typekit.net/af/5033af/0000000000000000000151d3/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3l https://use.typekit.net/af/5033af/0000000000000000000151d3/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=i4&v=3 — 68.8 KiB — 10 ms — font-display: swaphttps://www.brown.edu/themes/custom/brown/static/fonts/CircularStd-Book.otfCircularStd-Book.otf https://www.brown.edu/themes/custom/brown/static/fonts/CircularStd-Book.otf — 36.6 KiB — 39 ms — font-display: swaphttps://www.brown.edu/themes/custom/brown/static/fonts/CircularStd-Bold.otfCircularStd-Bold.otf https://www.brown.edu/themes/custom/brown/static/fonts/CircularStd-Bold.otf — 43.5 KiB — 39 ms — font-display: swaphttps://use.typekit.net/af/1286c7/0000000000000000000151d6/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3l https://use.typekit.net/af/1286c7/0000000000000000000151d6/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n4&v=3 — 57.7 KiB — 9 ms — font-display: swaphttps://www.brown.edu/themes/custom/brown/static/fonts/CircularStd-Medium.otfCircularStd-Medium.otf https://www.brown.edu/themes/custom/brown/static/fonts/CircularStd-Medium.otf — 43.0 KiB — 38 ms — font-display: swaphttps://use.typekit.net/af/ea8d85/0000000000000000000151d1/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3l https://use.typekit.net/af/ea8d85/0000000000000000000151d1/27/l?primer=7cdcb44be4a7db8877ffa5c0007b8dd865b3bbc383831fe2ea177f62257a9191&fvd=n7&v=3 — 57.3 KiB — 12 ms — font-display: swap
l woff2 swap
Size 69 KB
Load time 10 ms
Start 657 ms
Risk FOUT — text flashes from fallback to web font
CircularStd-Book.otf otf swap
Size 37 KB
Load time 39 ms
Start 668 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
CircularStd-Bold.otf otf swap
Size 43 KB
Load time 39 ms
Start 670 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
l woff2 swap
Size 58 KB
Load time 9 ms
Start 670 ms
Risk FOUT — text flashes from fallback to web font
CircularStd-Medium.otf otf swap
Size 43 KB
Load time 38 ms
Start 671 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 12 ms
Start 671 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 ~37 KB and ~74 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
82 requests over 1677ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.4 s LCP 3.8 shttps://brown.edu// https://brown.edu/ — 302 — 126 B — 316 ms — http/1.0https://www.brown.edu/www.brown.edu/ https://www.brown.edu/ — 200 — 19.3 KiB — 127 ms — h2https://www.brown.edu/sites/default/files/css/css_iDcWWw2TWbrGS61l8WyrHSJnxyn8aQIexPQe4mppmjU.css?delta=0&language=en&theme=brown&include=eJx1jDsSwjAMBS_kiVNxHY0Si9igWBrJ-d0eJhQUkPbt7kN3alDqg8YmFkf3ru8hy0yw3gL-UhbAOmYx4FKffqFkBdqVxWgw2Srkkgic-JQuGsWWoeH-D-sMnyOWlRzUZH0_1pEuZMUDSoO72IaWIOERzj5OLANyUDScDDV7TLYocvdduqXqMnDxTCn44Y3mOKDTCzfhdmswww.brown.edu/sites/default/files/c... https://www.brown.edu/sites/default/files/css/css_iDcWWw2TWbrGS61l8WyrHSJnxyn8aQIexPQe4mppmjU.css?delta=0&language=en&theme=brown&include=eJx1jDsSwjAMBS_kiVNxHY0Si9igWBrJ-d0eJhQUkPbt7kN3alDqg8YmFkf3ru8hy0yw3gL-UhbAOmYx4FKffqFkBdqVxWgw2Srkkgic-JQuGsWWoeH-D-sMnyOWlRzUZH0_1pEuZMUDSoO72IaWIOERzj5OLANyUDScDDV7TLYocvdduqXqMnDxTCn44Y3mOKDTCzfhdms — 200 — 1.4 KiB — 54 ms — h2https://www.brown.edu/sites/default/files/css/css_8vgz6odbIwqY9EZIoh6i9uF5WomfkgX634vfPlKkLxU.css?delta=1&language=en&theme=brown&include=eJx1jDsSwjAMBS_kiVNxHY0Si9igWBrJ-d0eJhQUkPbt7kN3alDqg8YmFkf3ru8hy0yw3gL-UhbAOmYx4FKffqFkBdqVxWgw2Srkkgic-JQuGsWWoeH-D-sMnyOWlRzUZH0_1pEuZMUDSoO72IaWIOERzj5OLANyUDScDDV7TLYocvdduqXqMnDxTCn44Y3mOKDTCzfhdmswww.brown.edu/sites/default/files/c... https://www.brown.edu/sites/default/files/css/css_8vgz6odbIwqY9EZIoh6i9uF5WomfkgX634vfPlKkLxU.css?delta=1&language=en&theme=brown&include=eJx1jDsSwjAMBS_kiVNxHY0Si9igWBrJ-d0eJhQUkPbt7kN3alDqg8YmFkf3ru8hy0yw3gL-UhbAOmYx4FKffqFkBdqVxWgw2Srkkgic-JQuGsWWoeH-D-sMnyOWlRzUZH0_1pEuZMUDSoO72IaWIOERzj5OLANyUDScDDV7TLYocvdduqXqMnDxTCn44Y3mOKDTCzfhdms — 200 — 168.0 KiB — 76 ms — h2https://www.brown.edu/sites/default/files/css/css_uSQVbcOcHjGtJVOJGoVIXL7pEEslYSRS4Q3QfbbyJY0.css?delta=2&language=en&theme=brown&include=eJx1jDsSwjAMBS_kiVNxHY0Si9igWBrJ-d0eJhQUkPbt7kN3alDqg8YmFkf3ru8hy0yw3gL-UhbAOmYx4FKffqFkBdqVxWgw2Srkkgic-JQuGsWWoeH-D-sMnyOWlRzUZH0_1pEuZMUDSoO72IaWIOERzj5OLANyUDScDDV7TLYocvdduqXqMnDxTCn44Y3mOKDTCzfhdmswww.brown.edu/sites/default/files/c... https://www.brown.edu/sites/default/files/css/css_uSQVbcOcHjGtJVOJGoVIXL7pEEslYSRS4Q3QfbbyJY0.css?delta=2&language=en&theme=brown&include=eJx1jDsSwjAMBS_kiVNxHY0Si9igWBrJ-d0eJhQUkPbt7kN3alDqg8YmFkf3ru8hy0yw3gL-UhbAOmYx4FKffqFkBdqVxWgw2Srkkgic-JQuGsWWoeH-D-sMnyOWlRzUZH0_1pEuZMUDSoO72IaWIOERzj5OLANyUDScDDV7TLYocvdduqXqMnDxTCn44Y3mOKDTCzfhdms — 200 — 2.7 KiB — 31 ms — h2https://www.brown.edu/themes/custom/brown/static/css/fonts.csswww.brown.edu/themes/custom/brown/s... https://www.brown.edu/themes/custom/brown/static/css/fonts.css — 200 — 407 B — 66 ms — 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https://region1.google-analytics.com/g/collect?v=2&tid=G-S0MX9K9C18&gtm=45je64h1v893268709z872578779za20gzb72578779zd72578779&_p=1776801402514&gcs=G100&gcd=13p3pPp2l5l1&npa=1&dma_cps=-&dma=1&gdid=dN2JhM2&are=1&cid=1272905569.1776801404&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616985~115938466~115938469~117266400~117512543&sid=1776801403&sct=1&seg=0&dl=https%3A%2F%2Fwww.brown.edu%2F&dt=Brown%20University&en=page_view&_fv=1&_nsi=1&_ss=1&tfd=1455 — 204 — 548 B — 97 ms — h2https://trkn.us/pixel/conv/ppt=24468;g=sitewide;gid=60752;cv1=https://www.brown.edu/;ord=273645517?gtmcb=1809405765;ip=141.227.188.220;cuidchk=1trkn.us/pixel/conv/ppt=24468;g=site... https://trkn.us/pixel/conv/ppt=24468;g=sitewide;gid=60752;cv1=https://www.brown.edu/;ord=273645517?gtmcb=1809405765;ip=141.227.188.220;cuidchk=1 — 200 — 721 B — 69 ms — http/1.1https://region1.google-analytics.com/g/collect?v=2&tid=G-QY13L4Q0C0&gtm=45je64h1v9135469645z872578779za20gzb72578779zd72578779&_p=1776801402514&gcs=G100&gcd=13p3pPp2l5l1&npa=1&dma_cps=-&dma=1&gdid=dN2JhM2&are=1&cid=1272905569.1776801404&frm=0&pscdl=denied&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512543&dl=https%3A%2F%2Fwww.brown.edu%2F&dt=Brown%20University&dp=%2F&sid=1776801403&sct=1&seg=0&en=page_view&_fv=1&_ss=1&ep.client_container_info=GTM-KX5NV9%20v262&ep.client_timestamp_iso=2026-04-21T19%3A56%3A43.374%2B00%3A00&ep.client_timezone=0&ep.value=&up.last_timezone=0&tfd=1539region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-QY13L4Q0C0&gtm=45je64h1v9135469645z872578779za20gzb72578779zd72578779&_p=1776801402514&gcs=G100&gcd=13p3pPp2l5l1&npa=1&dma_cps=-&dma=1&gdid=dN2JhM2&are=1&cid=1272905569.1776801404&frm=0&pscdl=denied&rcb=1&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938466~115938469~117266401~117512543&dl=https%3A%2F%2Fwww.brown.edu%2F&dt=Brown%20University&dp=%2F&sid=1776801403&sct=1&seg=0&en=page_view&_fv=1&_ss=1&ep.client_container_info=GTM-KX5NV9%20v262&ep.client_timestamp_iso=2026-04-21T19%3A56%3A43.374%2B00%3A00&ep.client_timezone=0&ep.value=&up.last_timezone=0&tfd=1539 — 204 — 48 B — 98 ms — h2https://region1.google-analytics.com/g/collect?v=2&tid=G-PCH3TG4K4L&gtm=45je64h1v9118223430z872578779za20gzb72578779zd72578779&_p=1776801402514&gcs=G100&gcd=13p3p3p2l5l1&npa=1&dma_cps=-&dma=1&gdid=dN2JhM2&are=1&cid=1272905569.1776801404&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~117512543&dl=https%3A%2F%2Fwww.brown.edu%2F&dt=Brown%20University&dp=%2F&sid=1776801403&sct=1&seg=0&en=page_view&_fv=1&_ss=1&ep.client_container_info=GTM-KX5NV9%20v262&ep.client_timestamp_iso=2026-04-21T19%3A56%3A43.370%2B00%3A00&ep.client_timezone=0&ep.value=&up.last_timezone=0&tfd=1617region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-PCH3TG4K4L&gtm=45je64h1v9118223430z872578779za20gzb72578779zd72578779&_p=1776801402514&gcs=G100&gcd=13p3p3p2l5l1&npa=1&dma_cps=-&dma=1&gdid=dN2JhM2&are=1&cid=1272905569.1776801404&frm=0&pscdl=denied&rcb=14&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115616986~115938466~115938468~117266401~117512543&dl=https%3A%2F%2Fwww.brown.edu%2F&dt=Brown%20University&dp=%2F&sid=1776801403&sct=1&seg=0&en=page_view&_fv=1&_ss=1&ep.client_container_info=GTM-KX5NV9%20v262&ep.client_timestamp_iso=2026-04-21T19%3A56%3A43.370%2B00%3A00&ep.client_timezone=0&ep.value=&up.last_timezone=0&tfd=1617 — 204 — 20 B — 30 ms — h3https://www.brown.edu/themes/custom/brown/static/site.webmanifestwww.brown.edu/themes/custom/brown/s... https://www.brown.edu/themes/custom/brown/static/site.webmanifest — 200 — 0 B — 6 ms — h2https://www.brown.edu/themes/custom/brown/static/favicon-32x32.pngwww.brown.edu/themes/custom/brown/s... https://www.brown.edu/themes/custom/brown/static/favicon-32x32.png — 200 — 2.7 KiB — 27 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 1346ms · 775KB · $18/mo
www.brown.edu
Other
Costly
Execution 585ms
Transfer 83 KB
Unused 52%
Monthly Cost $8/mo
www.brown.edu
Other
Costly
Execution 319ms
Transfer 19 KB
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Optional
Execution 131ms
Transfer 175 KB
Unused 33%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 111ms
Transfer 0 KB
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 69ms
Transfer 173 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 173 KB
Unused 42%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 63ms
Transfer 152 KB
Unused 42%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.brown.edu adds 585ms and costs ~$8/month
  • www.brown.edu adds 319ms and costs ~$4/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.brown.edu takes 585ms 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

52% of www.brown.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.brown.edu takes 319ms 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

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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