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Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
87
GRADE
B
FIX
3
REVIEW
4
PASS
6
INFO
2

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

96
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.
100
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
92
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

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

883 ms

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

1.27 s

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

10 ms

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

0.005

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

1.09 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.09 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
6 PASS 4 REVIEW 3 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 (1.5 MiB of 1.5 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
91 resources · 1.5 MB · 89 KB savings available
FIX
91 resources · 1.5 MB · 89 KB savings available
Warning::
Page weight 534 KB over 1MB target
Got: 1.5 MB Expected: ≤ 1 MB
Info::
~89 KB of savings available
Warning::
90 third-party resources (100% of weight)
Info::
2 resources over 200KB
91 resources · 1.5 MiB · 90 third-party 534.2 KiB over 1MB target
Image 49% · 769.0 KiB
JavaScript 34% · 535.9 KiB
Font 8% · 119.3 KiB
CSS 4% · 69.2 KiB
Document 4% · 56.7 KiB
Other 1% · 8.1 KiB

~88.6 KiB of savings available

Remove unused JavaScript: 88.6 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
Page Weight Budget
1.5 MB transferred, 91 requests
REVIEW
1.5 MB transferred, 91 requests
Info::
Page weighs 3.3 MB (1.5 MB transferred)
Warning::
JavaScript is 536 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 536 KB
Info::
91 HTTP requests
Info::
Estimated 0.32 g CO2 per page load
1.5 MB / 2.4 MB budget
1.5 MB transferred
91 requests
0.32 g CO2 per page load
Images 764.1 KiB 49%
JavaScript 535.9 KiB 34%
Fonts 119.3 KiB 8%
CSS 69.2 KiB 4%
HTML 56.7 KiB 4%
Other 7.8 KiB 0%
Other 5.0 KiB 0%
Other 260 B 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
JS Execution Cost
542ms total JS execution
REVIEW
542ms total JS execution
Info::
https://www.hbs.edu/: 168ms CPU time
Info::
https://www.hbs.edu/_next/static/chunks/framework-...: 162ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-N2N...: 131ms CPU time
Info::
Unattributable: 81ms CPU time
Warning::
Third-party scripts: 542ms (100% of total)

Main Thread Breakdown

Script Evaluation 51% Other 19% Style & Layout 16% Script Parsing & Compilation 7% Rendering 3%
ScriptTotalScriptingParse/CompileParty
https://www.hbs.edu/168ms1ms0ms3rd
https://www.hbs.edu/_next/static/chunks/framework-36d24eea1c3f3323.js162ms144ms3ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-N2NWNWX131ms112ms18ms3rd
Unattributable81ms4ms0ms3rd
B
JS Bundles
39 scripts, 89 KB unused
REVIEW
39 scripts, 89 KB unused
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-N2N...: 67 KB unused (36%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.hbs.edu/_next/static/chunks/main-ce959...: 21 KB unused (55%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 89 KB
89 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtm.js?id=GTM-N2NWNWX185 KB67 KB (36%)3rd
https://www.hbs.edu/_next/static/chunks/main-ce9596263a5951d7.js40 KB21 KB (55%)3rd
https://www.hbs.edu/_next/static/chunks/6629.81d39621c800aaec.js26 KB3rd
https://www.hbs.edu/_next/static/chunks/6457.2fb5c7705c917c70.js5 KB3rd
https://www.hbs.edu/_next/static/chunks/8457-5a90e490a5ff88c5.js6 KB3rd
https://www.hbs.edu/_next/static/chunks/7229-3e054fb86507761e.js24 KB3rd
https://www.hbs.edu/_next/static/chunks/6324-92208b4519db620c.js7 KB3rd
https://www.hbs.edu/_next/static/chunks/7828.fda33af7c6c848ea.js4 KB3rd
https://www.hbs.edu/_next/static/chunks/8207-6c110bb7f8d01941.js13 KB3rd
https://www.hbs.edu/_next/static/chunks/882-a7aad3f92ab84a13.js6 KB3rd

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+
Image Optimization
8 images, 0 KB saveable
PASS
8 images, 0 KB saveable
Info::
All images are well-optimized
8 images 764 KB
0 oversized -0 KB
1 legacy format
0 missing dimensions CLS risk
A+
Font Loading
3 fonts (119 KB)
PASS
3 fonts (119 KB)
Info::
3 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

3

119 KB total

Render-blocking

0

of 3

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s FCP 883 ms LCP 1.3 shttps://www.hbs.edu/static-assets/fonts/Graphik/Graphik-Semibold.woff2Graphik-Semibold.woff2 https://www.hbs.edu/static-assets/fonts/Graphik/Graphik-Semibold.woff2 — 42.4 KiB — 31 ms — font-display: swaphttps://www.hbs.edu/static-assets/fonts/Graphik/Graphik-Regular.woff2Graphik-Regular.woff2 https://www.hbs.edu/static-assets/fonts/Graphik/Graphik-Regular.woff2 — 37.7 KiB — 35 ms — font-display: swaphttps://www.hbs.edu/static-assets/fonts/Graphik/Graphik-Bold.woff2Graphik-Bold.woff2 https://www.hbs.edu/static-assets/fonts/Graphik/Graphik-Bold.woff2 — 39.2 KiB — 34 ms — font-display: swap
Graphik-Semibold.woff2 woff2 swap
Size 42 KB
Load time 31 ms
Start 635 ms
Risk FOUT — text flashes from fallback to web font
Graphik-Regular.woff2 woff2 swap
Size 38 KB
Load time 35 ms
Start 635 ms
Risk FOUT — text flashes from fallback to web font
Graphik-Bold.woff2 woff2 swap
Size 39 KB
Load time 34 ms
Start 636 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
91 requests over 1464ms
INFO
0 ms 500 ms 1.0 s 1.5 s FCP 883 ms LCP 1.3 shttps://hbs.edu// https://hbs.edu/ — 301 — 124 B — 392 ms — http/1.0https://www.hbs.edu/www.hbs.edu/ https://www.hbs.edu/ — 200 — 56.7 KiB — 79 ms — h2https://cloudinary.hbs.edu/hbsit/image/fetch/q_auto,c_fill,ar_1024:576/f_webp/https%3A%2F%2Fwww.hbs.edu%2Fctfassets%2Fpublic%2Fimages%2F6ab9FgrSm6fizWUpIfrhj9%2Fcampus.jpgcloudinary.hbs.edu/hbsit/image/fetc... https://cloudinary.hbs.edu/hbsit/image/fetch/q_auto,c_fill,ar_1024:576/f_webp/https%3A%2F%2Fwww.hbs.edu%2Fctfassets%2Fpublic%2Fimages%2F6ab9FgrSm6fizWUpIfrhj9%2Fcampus.jpg — 200 — 241.7 KiB — 164 ms — h2https://www.hbs.edu/_next/static/css/9f6e109b3cb8ad9f.csswww.hbs.edu/_next/static/css/9f6e10... https://www.hbs.edu/_next/static/css/9f6e109b3cb8ad9f.css — 200 — 10.4 KiB — 54 ms — h2https://www.hbs.edu/_next/static/css/15cead8fdda32957.csswww.hbs.edu/_next/static/css/15cead... https://www.hbs.edu/_next/static/css/15cead8fdda32957.css — 200 — 719 B — 41 ms — h2https://www.hbs.edu/_next/static/css/e61c5b03c11c6a54.csswww.hbs.edu/_next/static/css/e61c5b... https://www.hbs.edu/_next/static/css/e61c5b03c11c6a54.css — 200 — 2.1 KiB — 42 ms — h2https://www.hbs.edu/_next/static/css/03c2fd345cd8276c.csswww.hbs.edu/_next/static/css/03c2fd... https://www.hbs.edu/_next/static/css/03c2fd345cd8276c.css — 200 — 1.3 KiB — 46 ms — h2https://www.hbs.edu/_next/static/css/3f66e550d73c6e84.csswww.hbs.edu/_next/static/css/3f66e5... https://www.hbs.edu/_next/static/css/3f66e550d73c6e84.css — 200 — 880 B — 42 ms — h2https://www.hbs.edu/_next/static/css/a6fcd9bab3951a3d.csswww.hbs.edu/_next/static/css/a6fcd9... https://www.hbs.edu/_next/static/css/a6fcd9bab3951a3d.css — 200 — 5.7 KiB — 43 ms — h2https://www.hbs.edu/_next/static/css/ff0105b5d3fa51db.csswww.hbs.edu/_next/static/css/ff0105... https://www.hbs.edu/_next/static/css/ff0105b5d3fa51db.css — 200 — 1.6 KiB — 44 ms — h2https://www.hbs.edu/_next/static/css/108ff4a9f592e080.csswww.hbs.edu/_next/static/css/108ff4... https://www.hbs.edu/_next/static/css/108ff4a9f592e080.css — 200 — 1.6 KiB — 46 ms — h2https://www.hbs.edu/_next/static/css/5874665c0b04138c.csswww.hbs.edu/_next/static/css/587466... https://www.hbs.edu/_next/static/css/5874665c0b04138c.css — 200 — 3.1 KiB — 46 ms — h2https://www.hbs.edu/_next/static/css/8edd2dd0b6034503.csswww.hbs.edu/_next/static/css/8edd2d... https://www.hbs.edu/_next/static/css/8edd2dd0b6034503.css — 200 — 1.2 KiB — 47 ms — h2https://www.hbs.edu/_next/static/css/2e74e658894adad8.csswww.hbs.edu/_next/static/css/2e74e6... https://www.hbs.edu/_next/static/css/2e74e658894adad8.css — 200 — 1.4 KiB — 61 ms — h2https://www.hbs.edu/_next/static/css/7643a95e0d381fd1.csswww.hbs.edu/_next/static/css/7643a9... https://www.hbs.edu/_next/static/css/7643a95e0d381fd1.css — 200 — 1.3 KiB — 53 ms — h2https://www.hbs.edu/_next/static/css/67521e77d9709978.csswww.hbs.edu/_next/static/css/67521e... https://www.hbs.edu/_next/static/css/67521e77d9709978.css — 200 — 2.3 KiB — 47 ms — h2https://www.hbs.edu/_next/static/css/ecd1a8fce918547c.csswww.hbs.edu/_next/static/css/ecd1a8... https://www.hbs.edu/_next/static/css/ecd1a8fce918547c.css — 200 — 1.5 KiB — 48 ms — h2https://www.hbs.edu/_next/static/css/5fdcc8ac67fa23eb.csswww.hbs.edu/_next/static/css/5fdcc8... https://www.hbs.edu/_next/static/css/5fdcc8ac67fa23eb.css — 200 — 1.4 KiB — 54 ms — h2https://www.hbs.edu/_next/static/css/e5b163eef06e5ff2.csswww.hbs.edu/_next/static/css/e5b163... https://www.hbs.edu/_next/static/css/e5b163eef06e5ff2.css — 200 — 916 B — 56 ms — h2https://www.hbs.edu/_next/static/css/011ef4e3762eaf92.csswww.hbs.edu/_next/static/css/011ef4... https://www.hbs.edu/_next/static/css/011ef4e3762eaf92.css — 200 — 1.2 KiB — 48 ms — h2https://www.hbs.edu/_next/static/css/9be0703e5da50893.csswww.hbs.edu/_next/static/css/9be070... https://www.hbs.edu/_next/static/css/9be0703e5da50893.css — 200 — 553 B — 49 ms — h2https://www.hbs.edu/_next/static/css/d40e329ea8e404c6.csswww.hbs.edu/_next/static/css/d40e32... https://www.hbs.edu/_next/static/css/d40e329ea8e404c6.css — 200 — 2.3 KiB — 57 ms — h2https://www.hbs.edu/_next/static/css/7fcde8dbfdace308.csswww.hbs.edu/_next/static/css/7fcde8... https://www.hbs.edu/_next/static/css/7fcde8dbfdace308.css — 200 — 5.4 KiB — 58 ms — h2https://www.hbs.edu/_next/static/css/d3a84a08910d7bcb.csswww.hbs.edu/_next/static/css/d3a84a... https://www.hbs.edu/_next/static/css/d3a84a08910d7bcb.css — 200 — 2.3 KiB — 61 ms — h2https://www.hbs.edu/_next/static/css/98af877c47570306.csswww.hbs.edu/_next/static/css/98af87... https://www.hbs.edu/_next/static/css/98af877c47570306.css — 200 — 1.7 KiB — 61 ms — h2https://www.hbs.edu/_next/static/css/deea3484264686b3.csswww.hbs.edu/_next/static/css/deea34... https://www.hbs.edu/_next/static/css/deea3484264686b3.css — 200 — 3.9 KiB — 67 ms — h2https://www.hbs.edu/_next/static/css/b9d82115aea79ee9.csswww.hbs.edu/_next/static/css/b9d821... https://www.hbs.edu/_next/static/css/b9d82115aea79ee9.css — 200 — 1.7 KiB — 79 ms — h2https://www.hbs.edu/_next/static/css/af44b0e40bd6ff10.csswww.hbs.edu/_next/static/css/af44b0... https://www.hbs.edu/_next/static/css/af44b0e40bd6ff10.css — 200 — 3.8 KiB — 62 ms — h2https://www.hbs.edu/_next/static/css/10d5801b181e9f25.csswww.hbs.edu/_next/static/css/10d580... https://www.hbs.edu/_next/static/css/10d5801b181e9f25.css — 200 — 1.1 KiB — 64 ms — h2https://www.hbs.edu/_next/static/css/f7c4187b684d58d0.csswww.hbs.edu/_next/static/css/f7c418... https://www.hbs.edu/_next/static/css/f7c4187b684d58d0.css — 200 — 2.1 KiB — 65 ms — h2
0 ms 500 ms 1.0 s 1.5 s FCP 883 ms LCP 1.3 shttps://hbs.edu// https://hbs.edu/ — 301 — 124 B — 392 ms — http/1.0https://www.hbs.edu/www.hbs.edu/ https://www.hbs.edu/ — 200 — 56.7 KiB — 79 ms — h2https://cloudinary.hbs.edu/hbsit/image/fetch/q_auto,c_fill,ar_1024:576/f_webp/https%3A%2F%2Fwww.hbs.edu%2Fctfassets%2Fpublic%2Fimages%2F6ab9FgrSm6fizWUpIfrhj9%2Fcampus.jpgcloudinary.hbs.edu/hbsit/image/fetc... https://cloudinary.hbs.edu/hbsit/image/fetch/q_auto,c_fill,ar_1024:576/f_webp/https%3A%2F%2Fwww.hbs.edu%2Fctfassets%2Fpublic%2Fimages%2F6ab9FgrSm6fizWUpIfrhj9%2Fcampus.jpg — 200 — 241.7 KiB — 164 ms — h2https://www.hbs.edu/_next/static/css/9f6e109b3cb8ad9f.csswww.hbs.edu/_next/static/css/9f6e10... https://www.hbs.edu/_next/static/css/9f6e109b3cb8ad9f.css — 200 — 10.4 KiB — 54 ms — h2https://www.hbs.edu/_next/static/css/15cead8fdda32957.csswww.hbs.edu/_next/static/css/15cead... https://www.hbs.edu/_next/static/css/15cead8fdda32957.css — 200 — 719 B — 41 ms — h2https://www.hbs.edu/_next/static/css/e61c5b03c11c6a54.csswww.hbs.edu/_next/static/css/e61c5b... https://www.hbs.edu/_next/static/css/e61c5b03c11c6a54.css — 200 — 2.1 KiB — 42 ms — h2https://www.hbs.edu/_next/static/css/03c2fd345cd8276c.csswww.hbs.edu/_next/static/css/03c2fd... https://www.hbs.edu/_next/static/css/03c2fd345cd8276c.css — 200 — 1.3 KiB — 46 ms — h2https://www.hbs.edu/_next/static/css/3f66e550d73c6e84.csswww.hbs.edu/_next/static/css/3f66e5... https://www.hbs.edu/_next/static/css/3f66e550d73c6e84.css — 200 — 880 B — 42 ms — h2https://www.hbs.edu/_next/static/css/a6fcd9bab3951a3d.csswww.hbs.edu/_next/static/css/a6fcd9... https://www.hbs.edu/_next/static/css/a6fcd9bab3951a3d.css — 200 — 5.7 KiB — 43 ms — h2https://www.hbs.edu/_next/static/css/ff0105b5d3fa51db.csswww.hbs.edu/_next/static/css/ff0105... https://www.hbs.edu/_next/static/css/ff0105b5d3fa51db.css — 200 — 1.6 KiB — 44 ms — h2https://www.hbs.edu/_next/static/css/108ff4a9f592e080.csswww.hbs.edu/_next/static/css/108ff4... https://www.hbs.edu/_next/static/css/108ff4a9f592e080.css — 200 — 1.6 KiB — 46 ms — h2https://www.hbs.edu/_next/static/css/5874665c0b04138c.csswww.hbs.edu/_next/static/css/587466... https://www.hbs.edu/_next/static/css/5874665c0b04138c.css — 200 — 3.1 KiB — 46 ms — h2https://www.hbs.edu/_next/static/css/8edd2dd0b6034503.csswww.hbs.edu/_next/static/css/8edd2d... https://www.hbs.edu/_next/static/css/8edd2dd0b6034503.css — 200 — 1.2 KiB — 47 ms — h2https://www.hbs.edu/_next/static/css/2e74e658894adad8.csswww.hbs.edu/_next/static/css/2e74e6... https://www.hbs.edu/_next/static/css/2e74e658894adad8.css — 200 — 1.4 KiB — 61 ms — h2https://www.hbs.edu/_next/static/css/7643a95e0d381fd1.csswww.hbs.edu/_next/static/css/7643a9... https://www.hbs.edu/_next/static/css/7643a95e0d381fd1.css — 200 — 1.3 KiB — 53 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 542ms · 287KB · $7/mo
www.hbs.edu
Other
Optional
Execution 168ms
Transfer 57 KB
Monthly Cost $2/mo
www.hbs.edu
Other
Optional
Execution 162ms
Transfer 45 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 131ms
Transfer 185 KB
Unused 36%
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 81ms
Transfer 0 KB
Monthly Cost $1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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