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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
71
GRADE
C
FIX
4
REVIEW
4
PASS
5
INFO
2

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

Mobile Desktop
69
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
93
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
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.

1.40 s

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

3.33 s

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

196 ms

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

0.006

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

1.87 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.

3.35 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
F
Page Weight Budget
Action
8.2 MB transferred, 76 requests
FIX
8.2 MB transferred, 76 requests
Critical::
Page weighs 10.5 MB (8.2 MB transferred)
Warning::
Images are 4.8 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.8 MB
Warning::
JavaScript is 748 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 748 KB
Info::
76 HTTP requests
Info::
Estimated 1.7 g CO2 per page load
8.2 MB / 2.4 MB budget
8.2 MB transferred
76 requests
1.7 g CO2 per page load
Images 4.8 MiB 59%
Other 2.2 MiB 27%
JavaScript 748.2 KiB 9%
HTML 179.2 KiB 2%
CSS 127.1 KiB 2%
Fonts 120.9 KiB 1%
Other 21.1 KiB 0%
Other 13.3 KiB 0%
Other 945 B 0%
Other 599 B 0%
Other 559 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

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
Page Weight Inventory
Action
76 resources · 8.2 MB · 264 KB savings available
FIX
76 resources · 8.2 MB · 264 KB savings available
Warning::
Page weight 7.2 MB over 1MB target
Got: 8.2 MB Expected: ≤ 1 MB
Info::
~264 KB of savings available
Warning::
75 third-party resources (100% of weight)
Info::
13 resources over 200KB
76 resources · 8.2 MiB · 75 third-party 7.2 MiB over 1MB target
Image 59% · 4.8 MiB
Media 27% · 2.2 MiB
JavaScript 9% · 748.2 KiB
Document 2% · 179.6 KiB
CSS 2% · 127.1 KiB
Font 1% · 120.9 KiB
Other 0% · 23.5 KiB

~264.4 KiB of savings available

Remove unused JavaScript: 264.4 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
25 images, 0 KB saveable
REVIEW
25 images, 0 KB saveable
Warning::
https://www.juicer.io/api/media/28179327?s=4f59c70... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brandeis.edu/images/vr-960.jpg is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/27774582?s=460a2cd... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/27203318?s=8d77cc1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/26527186?s=3bccbd2... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brandeis.edu/images/aerial-volen-1920.... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brandeis.edu/stories/2026/march/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brandeis.edu/stories/2026/april/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28322249?s=68879d6... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/27520431?s=6ad8efc... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/26923237?s=8df0935... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brandeis.edu/stories/2026/february/ima... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/27349586?s=180c6e1... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/27067900?s=0b1000b... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/26982790?s=1f27b00... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/26612569?s=4fee027... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.brandeis.edu/stories/2026/april/images... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.juicer.io/api/media/28272923?s=d095956... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
25 images 4.8 MB
0 oversized -0 KB
24 legacy format
18 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

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
1233ms total JS execution
REVIEW
1233ms total JS execution
Warning::
https://www.brandeis.edu/_files/js/script.min.js: 309ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-KB3...: 230ms CPU time
Info::
https://www.brandeis.edu/: 214ms CPU time
Info::
Unattributable: 172ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-MFGT...: 130ms CPU time
Warning::
Third-party scripts: 1233ms (100% of total)

Main Thread Breakdown

Script Evaluation 46% Other 23% Style & Layout 16% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.brandeis.edu/_files/js/script.min.js309ms137ms4ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-KB3L3M230ms160ms50ms3rd
https://www.brandeis.edu/214ms4ms1ms3rd
Unattributable172ms5ms0ms3rd
https://www.googletagmanager.com/gtag/js?id=G-MFGTX36NQY&cx=c&gtm=4e64k0130ms108ms21ms3rd
https://www.googletagmanager.com/gtag/js?id=DC-14691538&cx=c&gtm=4e64k0109ms88ms21ms3rd
https://i071.brandeis.edu/script.js69ms55ms8ms3rd
C
JS Bundles
Action
25 scripts, 264 KB unused
REVIEW
25 scripts, 264 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-KB3...: 70 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-MFGT...: 68 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=DC-146...: 60 KB unused (46%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.brandeis.edu/_files/js/script.min.js: 46 KB unused (48%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://ajax.googleapis.com/ajax/libs/jquery/3.1.0...: 20 KB unused (69%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 264 KB
264 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-KB3L3M176 KB70 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-MFGTX36NQY&cx=c&gtm=4e64k0170 KB68 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=DC-14691538&cx=c&gtm=4e64k0130 KB60 KB (46%)✓3rd
https://www.brandeis.edu/_files/js/script.min.js97 KB46 KB (48%)✓3rd
https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js30 KB20 KB (69%)✓3rd
https://i071.brandeis.edu/script.js41 KB—✓3rd
https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.01 KB—✓3rd
https://www.brandeis.edu/_files/js/google.js1 KB—✓3rd
https://www.brandeis.edu/_files/js/hh-additions.js9 KB—✗3rd
https://cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/imagesloaded.pkgd.min.js0 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
4 fonts (121 KB)
PASS
4 fonts (121 KB)
Info::
4 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

4

121 KB total

Render-blocking

0

of 4

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 3.3 shttps://fonts.gstatic.com/s/hind/v18/5aU19_a8oxmIfJpbERySjRhc9V0.woff25aU19_a8oxmIfJpbERySjRh... https://fonts.gstatic.com/s/hind/v18/5aU19_a8oxmIfJpbERySjRhc9V0.woff2 — 8.6 KiB — 32 ms — font-display: swaphttps://fonts.gstatic.com/s/hind/v18/5aU19_a8oxmIfLZcERySjRhc9V0.woff25aU19_a8oxmIfLZcERySjRh... https://fonts.gstatic.com/s/hind/v18/5aU19_a8oxmIfLZcERySjRhc9V0.woff2 — 8.5 KiB — 29 ms — font-display: swaphttps://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2u-4e0qyriQwlOrhSvowK_l5... https://fonts.gstatic.com/s/merriweather/v33/u-4e0qyriQwlOrhSvowK_l5UcA6zuSYEqOzpPe3HOZJ5eX1WtLaQwmYiSeqqJ-mXq1Gi.woff2 — 95.4 KiB — 42 ms — font-display: swaphttps://fonts.gstatic.com/s/hind/v18/5aU69_a8oxmIdGl4BDGwgDI.woff25aU69_a8oxmIdGl4BDGwgDI... https://fonts.gstatic.com/s/hind/v18/5aU69_a8oxmIdGl4BDGwgDI.woff2 — 8.5 KiB — 39 ms — font-display: swap
5aU19_a8oxmIfJpbERySjRh... woff2 swap
Size 9 KB
Load time 32 ms
Start 848 ms
Risk FOUT — text flashes from fallback to web font
5aU19_a8oxmIfLZcERySjRh... woff2 swap
Size 9 KB
Load time 29 ms
Start 849 ms
Risk FOUT — text flashes from fallback to web font
u-4e0qyriQwlOrhSvowK_l5... woff2 swap
Size 95 KB
Load time 42 ms
Start 849 ms
Risk FOUT — text flashes from fallback to web font
5aU69_a8oxmIdGl4BDGwgDI... woff2 swap
Size 8 KB
Load time 39 ms
Start 849 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)
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
76 requests over 3202ms
INFO
0 ms 1.0 s 2.0 s 3.0 s FCP 1.4 s LCP 3.3 shttps://brandeis.edu// https://brandeis.edu/ — 302 — 430 B — 260 ms — h2https://www.brandeis.edu/www.brandeis.edu/ https://www.brandeis.edu/ — 200 — 179.2 KiB — 362 ms — h2https://fonts.googleapis.com/css?family=Merriweather:400,300,700fonts.googleapis.com/css?family=Mer... https://fonts.googleapis.com/css?family=Merriweather:400,300,700 — 200 — 748 B — 39 ms — h2https://fonts.googleapis.com/css?family=Hind:300,400,500,600,700fonts.googleapis.com/css?family=Hin... https://fonts.googleapis.com/css?family=Hind:300,400,500,600,700 — 200 — 1.0 KiB — 35 ms — h2https://www.brandeis.edu/_files/css/style.csswww.brandeis.edu/_files/css/style.c... https://www.brandeis.edu/_files/css/style.css — 200 — 75.9 KiB — 148 ms — h2https://www.brandeis.edu/_files/css/custom-style.csswww.brandeis.edu/_files/css/custom-... https://www.brandeis.edu/_files/css/custom-style.css — 200 — 33.9 KiB — 129 ms — h2https://www.brandeis.edu/_files/css/custom-style-hh.csswww.brandeis.edu/_files/css/custom-... https://www.brandeis.edu/_files/css/custom-style-hh.css — 200 — 8.7 KiB — 150 ms — h2https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.jsajax.googleapis.com/ajax/libs/jquer... https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js — 200 — 30.1 KiB — 29 ms — h2https://www.brandeis.edu/_files/js/calendar.jswww.brandeis.edu/_files/js/calendar... https://www.brandeis.edu/_files/js/calendar.js — 200 — 3.7 KiB — 155 ms — h2https://www.brandeis.edu/_files/js/rssFeed.jswww.brandeis.edu/_files/js/rssFeed.... https://www.brandeis.edu/_files/js/rssFeed.js — 200 — 11.2 KiB — 151 ms — h2https://www.brandeis.edu/_files/favicons/manifest.jsonwww.brandeis.edu/_files/favicons/ma... https://www.brandeis.edu/_files/favicons/manifest.json — 200 — 599 B — 282 ms — h2https://www.brandeis.edu/images/aerial-volen-1920.jpgwww.brandeis.edu/images/aerial-vole... https://www.brandeis.edu/images/aerial-volen-1920.jpg — 200 — 360.3 KiB — 163 ms — h2https://cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/imagesloaded.pkgd.min.jscdnjs.cloudflare.com/ajax/libs/flic... https://cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/imagesloaded.pkgd.min.js — -1 — 0 B — 223 ms — https://www.brandeis.edu/images/vr-960.jpgwww.brandeis.edu/images/vr-960.jpg https://www.brandeis.edu/images/vr-960.jpg — 200 — 73.3 KiB — 275 ms — h2https://www.brandeis.edu/stories/2026/february/images/guay-hannah.jpgwww.brandeis.edu/stories/2026/febru... https://www.brandeis.edu/stories/2026/february/images/guay-hannah.jpg — 200 — 164.1 KiB — 242 ms — h2https://www.brandeis.edu/stories/2026/march/images/hiatt-photo.jpgwww.brandeis.edu/stories/2026/march... https://www.brandeis.edu/stories/2026/march/images/hiatt-photo.jpg — 200 — 84.7 KiB — 275 ms — h2https://www.brandeis.edu/stories/2026/april/images/second-transcript.jpgwww.brandeis.edu/stories/2026/april... https://www.brandeis.edu/stories/2026/april/images/second-transcript.jpg — 200 — 373.0 KiB — 172 ms — h2https://cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/flickity.pkgd.min.jscdnjs.cloudflare.com/ajax/libs/flic... https://cdnjs.cloudflare.com/ajax/libs/flickity/2.2.2/flickity.pkgd.min.js — 200 — 12.7 KiB — 47 ms — h3https://unpkg.com/focus-within-polyfill/dist/focus-within-polyfill.jsunpkg.com/focus-within-polyfill/dis... https://unpkg.com/focus-within-polyfill/dist/focus-within-polyfill.js — 302 — 321 B — 124 ms — h3https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0cdnjs.cloudflare.com/polyfill/v3/po... https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?version=4.8.0 — 200 — 727 B — 51 ms — h3https://www.brandeis.edu/_files/js/script.min.jswww.brandeis.edu/_files/js/script.m... https://www.brandeis.edu/_files/js/script.min.js — 200 — 96.8 KiB — 265 ms — h2https://www.brandeis.edu/_files/js/google.jswww.brandeis.edu/_files/js/google.j... https://www.brandeis.edu/_files/js/google.js — 200 — 1019 B — 128 ms — h2https://www.brandeis.edu/_files/js/hh-additions.jswww.brandeis.edu/_files/js/hh-addit... https://www.brandeis.edu/_files/js/hh-additions.js — 200 — 8.7 KiB — 131 ms — h2https://www.googletagmanager.com/gtm.js?id=GTM-KB3L3Mwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-KB3L3M — 200 — 175.8 KiB — 57 ms — h2https://www.brandeis.edu/stories/2026/april/images/bemcobusmain.jpgwww.brandeis.edu/stories/2026/april... https://www.brandeis.edu/stories/2026/april/images/bemcobusmain.jpg — 200 — 170.5 KiB — 235 ms — h2https://www.brandeis.edu/images/facts/econ.webpwww.brandeis.edu/images/facts/econ.... https://www.brandeis.edu/images/facts/econ.webp — 200 — 58.4 KiB — 162 ms — h2https://www.brandeis.edu/images/facts/building.jpgwww.brandeis.edu/images/facts/build... https://www.brandeis.edu/images/facts/building.jpg — 200 — 244.7 KiB — 258 ms — 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HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 1233ms · 792KB · €13/mo
www.brandeis.edu
Other
Costly
Execution 309ms
Transfer 97 KB
Unused 48%
Monthly Cost €3/mo
Google Tag Manager
Tag Manager
Costly
Execution 230ms
Transfer 176 KB
Unused 40%
Monthly Cost €2/mo
www.brandeis.edu
Other
Costly
Execution 214ms
Transfer 179 KB
Monthly Cost €2/mo
Unattributable
Other
Optional
Execution 172ms
Transfer 0 KB
Monthly Cost €2/mo
Google Tag Manager
Tag Manager
Optional
Execution 130ms
Transfer 170 KB
Unused 40%
Monthly Cost €1/mo
Google Tag Manager
Tag Manager
Optional
Execution 109ms
Transfer 130 KB
Unused 46%
Monthly Cost €1/mo
i071.brandeis.edu
Other
Optional
Execution 69ms
Transfer 41 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.brandeis.edu adds 309ms and costs ~€3/month
  • Google Tag Manager adds 230ms and costs ~€2/month
  • www.brandeis.edu adds 214ms and costs ~€2/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.brandeis.edu takes 309ms 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 230ms 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.brandeis.edu 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

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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