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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
85
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.
81
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.

688 ms

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

2.69 s

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

7 ms

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

0.001

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

1.02 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.

3.00 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
3.7 MB transferred, 85 requests
FIX
3.7 MB transferred, 85 requests
Warning::
Page weighs 6.6 MB (3.7 MB transferred)
Warning::
Images are 2.5 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.5 MB
Warning::
JavaScript is 882 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 882 KB
Info::
85 HTTP requests
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
85 requests
0.78 g CO2 per page load
Images 2.5 MiB 68%
JavaScript 882.3 KiB 23%
Fonts 186.8 KiB 5%
CSS 107.5 KiB 3%
HTML 31.7 KiB 1%
Other 8.5 KiB 0%
Other 1.3 KiB 0%
Other 550 B 0%
Other 550 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 (3.7 MiB of 3.7 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Bundles
Action
21 scripts, 406 KB unused
FIX
21 scripts, 406 KB unused
Warning::
https://www.harvard.edu/wp-content/themes/core/ass...: 138 KB unused (86%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-KBLB...: 64 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5SG...: 64 KB unused (45%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.google.com/cse/static/element/b33cba58...: 49 KB unused (50%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://connect.facebook.net/en_US/fbevents.js: 37 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 406 KB
406 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/vendor.min.js?ver=5b4e48cf0fbd9ab8d8f2c32ec81b6cf96e8c138e7bde68035416aad021a85c7d15959b77e4103dbacc48c75561d99a307a31ef22b69513c11e9d57a52dd9594c161 KB138 KB (86%)✓3rd
https://www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e64f0153 KB64 KB (42%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G143 KB64 KB (45%)✓3rd
https://www.google.com/cse/static/element/b33cba5881f68fbf/cse_element__en.js?usqp=CAI%3D99 KB49 KB (50%)✓3rd
https://connect.facebook.net/en_US/fbevents.js96 KB37 KB (38%)✓3rd
https://cse.google.com/adsense/search/async-ads.js44 KB32 KB (73%)✓3rd
https://www.harvard.edu/wp-content/themes/core/assets/js/vendor/jquery.min.js?ver=3.4.131 KB23 KB (74%)✓3rd
https://www.harvard.edu/wp-content/plugins/wp-parsely/build/loader.js?ver=ecf94842061bea03d54b2 KB—✓3rd
https://www.harvard.edu/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f12 KB—✓3rd
https://stats.wp.com/e-202616.js2 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

F
Page Weight Inventory
Action
85 resources · 3.7 MB · 406 KB savings available
FIX
85 resources · 3.7 MB · 406 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~406 KB of savings available
Warning::
84 third-party resources (100% of weight)
Info::
3 resources over 200KB
85 resources · 3.7 MiB · 84 third-party 2.7 MiB over 1MB target
Image 68% · 2.5 MiB
JavaScript 23% · 882.3 KiB
Font 5% · 186.8 KiB
CSS 3% · 107.5 KiB
Document 1% · 31.8 KiB
Other 0% · 9.6 KiB

~406.0 KiB of savings available

Remove unused JavaScript: 406.0 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
46 images, 0 KB saveable
REVIEW
46 images, 0 KB saveable
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/themes/core/ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/themes/core/ass... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/04... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.harvard.edu/wp-content/uploads/2026/03... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
46 images 2.5 MB
0 oversized -0 KB
18 legacy format
24 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

Performance issues directly impact user engagement and conversion rates.

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

B
JS Execution Cost
864ms total JS execution
REVIEW
864ms total JS execution
Warning::
https://www.harvard.edu/: 364ms CPU time
Info::
Unattributable: 168ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-5SG...: 91ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-KBLB...: 68ms CPU time
Info::
https://www.harvard.edu/wp-content/themes/core/ass...: 63ms CPU time
Warning::
Third-party scripts: 864ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 26% Style & Layout 21% Script Parsing & Compilation 10%
ScriptTotalScriptingParse/CompileParty
https://www.harvard.edu/364ms4ms2ms3rd
Unattributable168ms22ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G91ms71ms15ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e64f068ms52ms15ms3rd
https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/vendor.min.js?ver=5b4e48cf0fbd9ab8d8f2c32ec81b6cf96e8c138e7bde68035416aad021a85c7d15959b77e4103dbacc48c75561d99a307a31ef22b69513c11e9d57a52dd9594c63ms17ms18ms3rd
https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/scripts.min.js?ver=e96cd733acfdfb3909cc0cb04a087f664206a8de87a4155863efaff221e67dd0693af3ebb48029ad20da849db0c2541451694c11732de2a206c55360f5ed521860ms50ms5ms3rd
https://connect.facebook.net/signals/config/116026588849778?v=2.9.298&r=stable&domain=www.harvard.edu&hme=c048e760b3fdc0fbdc117d7607b2c36e13eff2660c515ac72e86dac5ba060bb9&ex_m=104%2C205%2C154%2C22%2C72%2C73%2C145%2C68%2C67%2C11%2C162%2C90%2C16%2C138%2C127%2C39%2C75%2C78%2C134%2C159%2C164%2C8%2C4%2C5%2C7%2C6%2C3%2C91%2C101%2C165%2C170%2C219%2C62%2C186%2C187%2C55%2C277%2C30%2C74%2C231%2C230%2C229%2C23%2C33%2C103%2C61%2C10%2C63%2C97%2C98%2C99%2C105%2C130%2C31%2C29%2C132%2C133%2C129%2C128%2C155%2C76%2C158%2C156%2C157%2C50%2C60%2C123%2C15%2C161%2C45%2C264%2C265%2C263%2C26%2C27%2C28%2C48%2C146%2C77%2C112%2C18%2C20%2C44%2C40%2C42%2C41%2C83%2C92%2C96%2C110%2C144%2C147%2C46%2C111%2C24%2C21%2C119%2C69%2C36%2C149%2C148%2C150%2C141%2C139%2C25%2C35%2C59%2C109%2C160%2C70%2C17%2C152%2C114%2C81%2C66%2C19%2C85%2C86%2C116%2C84%2C136%2C135%2C34%2C279%2C294%2C212%2C201%2C202%2C200%2C297%2C289%2C52%2C213%2C107%2C131%2C80%2C121%2C54%2C47%2C49%2C113%2C120%2C126%2C58%2C64%2C151%2C115%2C37%2C32%2C53%2C56%2C100%2C163%2C1%2C124%2C14%2C122%2C12%2C2%2C57%2C93%2C65%2C118%2C89%2C88%2C166%2C167%2C94%2C95%2C9%2C125%2C102%2C51%2C142%2C87%2C79%2C71%2C117%2C106%2C43%2C143%2C0%2C82%2C137%2C140%2C153%2C38%2C108%2C13%2C16851ms44ms6ms3rd
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
5 fonts (187 KB)
PASS
5 fonts (187 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

187 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 688 ms LCP 2.7 shttps://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/gt-america/GT-America-Standard-Regular.woff2GT-America-Standard-Reg... https://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/gt-america/GT-America-Standard-Regular.woff2 — 47.9 KiB — 28 ms — font-display: swaphttps://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/icons-core/core-icons.ttf?4g884ccore-icons.ttf https://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/icons-core/core-icons.ttf?4g884c — 2.7 KiB — 20 ms — font-display: swaphttps://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/gt-america/GT-America-Standard-Medium.woff2GT-America-Standard-Med... https://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/gt-america/GT-America-Standard-Medium.woff2 — 51.2 KiB — 34 ms — font-display: swaphttps://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/canela/CanelaDeck-Regular-Web.woff2CanelaDeck-Regular-Web.... https://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/canela/CanelaDeck-Regular-Web.woff2 — 33.6 KiB — 33 ms — font-display: swaphttps://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/gt-america/GT-America-Standard-Bold.woff2GT-America-Standard-Bol... https://www.harvard.edu/wp-content/themes/core/assets/fonts/theme/gt-america/GT-America-Standard-Bold.woff2 — 51.3 KiB — 35 ms — font-display: swap
GT-America-Standard-Reg... woff2 swap
Size 48 KB
Load time 28 ms
Start 233 ms
Risk FOUT — text flashes from fallback to web font
core-icons.ttf ttf swap
Size 3 KB
Load time 20 ms
Start 233 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
GT-America-Standard-Med... woff2 swap
Size 51 KB
Load time 34 ms
Start 235 ms
Risk FOUT — text flashes from fallback to web font
CanelaDeck-Regular-Web.... woff2 swap
Size 34 KB
Load time 33 ms
Start 240 ms
Risk FOUT — text flashes from fallback to web font
GT-America-Standard-Bol... woff2 swap
Size 51 KB
Load time 35 ms
Start 241 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 ~1 KB and ~2 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
85 requests over 2271ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 688 ms LCP 2.7 shttps://harvard.edu// https://harvard.edu/ — 301 — 113 B — 12 ms — h2https://www.harvard.edu/www.harvard.edu/ https://www.harvard.edu/ — 200 — 25.9 KiB — 12 ms — h2https://www.harvard.edu/_static/??-eJyVjFsKgCAQAC+UbtLDr+gsYhstqCvuQtfPjzpAfwPDDNzVRC6KRUEvzCgQuSEEEdTOInCQvA5CrUaZk1K1mYrteoBfh5OSYpOv3vPmvJ8nv7plfACKxTMVwww.harvard.edu/_static/??-eJyVjFsK... https://www.harvard.edu/_static/??-eJyVjFsKgCAQAC+UbtLDr+gsYhstqCvuQtfPjzpAfwPDDNzVRC6KRUEvzCgQuSEEEdTOInCQvA5CrUaZk1K1mYrteoBfh5OSYpOv3vPmvJ8nv7plfACKxTMV — 200 — 5.7 KiB — 10 ms — h2https://www.harvard.edu/wp-content/themes/core/assets/css/dist/theme/master.min.css?ver=be07e4b44686d982d6f1d568f96376aad1013cad9a74be0e4b96c417c9db8aa6ee77060e75f00f77ec704c04b826215c91401eb2fa2da62575e6dd97bf8190fewww.harvard.edu/wp-content/themes/c... 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— 204 — 17 B — 104 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 864ms · 549KB · $11/mo
www.harvard.edu
Other
Costly
Execution 364ms
Transfer 26 KB
Monthly Cost $5/mo
Unattributable
Other
Optional
Execution 168ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 91ms
Transfer 143 KB
Unused 45%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 68ms
Transfer 153 KB
Unused 42%
Monthly Cost $1/mo
www.harvard.edu
Other
Optional
Execution 63ms
Transfer 161 KB
Unused 86%
Monthly Cost $1/mo
www.harvard.edu
Other
Optional
Execution 60ms
Transfer 27 KB
Monthly Cost $1/mo
Facebook Pixel
Advertising
Optional
Execution 51ms
Transfer 40 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.harvard.edu adds 364ms and costs ~$5/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.harvard.edu takes 364ms 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

86% of www.harvard.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

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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