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Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
70
GRADE
C
FIX
6
REVIEW
2
PASS
7
INFO
2

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

Mobile Desktop
57
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.

2.26 s

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

12.14 s

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

603 ms

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

0.008

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

3.07 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.

14.70 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
17
7 PASS 2 REVIEW 6 FIX
F
Page Weight Budget
Action
3.7 MB transferred, 86 requests
FIX
3.7 MB transferred, 86 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::
86 HTTP requests
Info::
Estimated 0.78 g CO2 per page load
3.7 MB / 2.4 MB budget
3.7 MB transferred
86 requests
0.78 g CO2 per page load
Images 2.5 MiB 68%
JavaScript 882.0 KiB 23%
Fonts 186.8 KiB 5%
CSS 108.9 KiB 3%
HTML 31.7 KiB 1%
Other 8.6 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
F
JS Execution Cost
Action
3918ms total JS execution
FIX
3918ms total JS execution
Warning::
https://www.harvard.edu/: 1324ms CPU time
Warning::
Unattributable: 693ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-5SG...: 306ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-KBLB...: 242ms CPU time
Info::
https://www.harvard.edu/wp-content/themes/core/ass...: 226ms CPU time
Warning::
Third-party scripts: 3918ms (100% of total)

Main Thread Breakdown

Script Evaluation 36% Other 26% Style & Layout 20% Script Parsing & Compilation 11% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.harvard.edu/1324ms17ms7ms3rd
Unattributable693ms108ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G306ms238ms58ms3rd
https://www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e64f0242ms176ms61ms3rd
https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/scripts.min.js?ver=e96cd733acfdfb3909cc0cb04a087f664206a8de87a4155863efaff221e67dd0693af3ebb48029ad20da849db0c2541451694c11732de2a206c55360f5ed5218226ms191ms20ms3rd
https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/vendor.min.js?ver=5b4e48cf0fbd9ab8d8f2c32ec81b6cf96e8c138e7bde68035416aad021a85c7d15959b77e4103dbacc48c75561d99a307a31ef22b69513c11e9d57a52dd9594c220ms62ms75ms3rd
https://connect.facebook.net/en_US/fbevents.js188ms140ms47ms3rd
https://cse.google.com/cse.js?cx=006776768860476326824:n4rl30fjc-e154ms125ms1ms3rd
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%2C168149ms108ms40ms3rd
https://www.google-analytics.com/analytics.js82ms58ms7ms3rd

Showing top 10 of 15 scripts

D
JS Bundles
Action
21 scripts, 405 KB unused
FIX
21 scripts, 405 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: 36 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 405 KB
405 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 KB36 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
86 resources · 3.7 MB · 405 KB savings available
FIX
86 resources · 3.7 MB · 405 KB savings available
Warning::
Page weight 2.7 MB over 1MB target
Got: 3.7 MB Expected: ≤ 1 MB
Info::
~405 KB of savings available
Warning::
85 third-party resources (100% of weight)
Info::
3 resources over 200KB
86 resources · 3.7 MiB · 85 third-party 2.7 MiB over 1MB target
Image 68% · 2.5 MiB
JavaScript 23% · 882.0 KiB
Font 5% · 186.8 KiB
CSS 3% · 108.9 KiB
Document 1% · 31.8 KiB
Other 0% · 9.7 KiB

~405.5 KiB of savings available

Remove unused JavaScript: 405.5 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/2026/04... 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/2026/03... 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/2026/03... 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/2026/03... 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::
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/2026/03... 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.
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

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

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 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s FCP 2.3 s LCP 12.1 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 — 22 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 — 24 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 — 37 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 — 38 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 — 38 ms — font-display: swap
GT-America-Standard-Reg... woff2 swap
Size 48 KB
Load time 22 ms
Start 188 ms
Risk FOUT — text flashes from fallback to web font
GT-America-Standard-Bol... woff2 swap
Size 51 KB
Load time 24 ms
Start 189 ms
Risk FOUT — text flashes from fallback to web font
GT-America-Standard-Med... woff2 swap
Size 51 KB
Load time 37 ms
Start 189 ms
Risk FOUT — text flashes from fallback to web font
core-icons.ttf ttf swap
Size 3 KB
Load time 38 ms
Start 189 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
CanelaDeck-Regular-Web.... woff2 swap
Size 34 KB
Load time 38 ms
Start 189 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
2 hints, 0 missing preconnects
PASS
2 hints, 0 missing preconnects
Info::
Page uses 2 resource hint(s)

Current Resource Hints

preconnect
—
preload
—
dns-prefetch
2
prefetch
—

2 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
86 requests over 2169ms
INFO
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https://www.facebook.com/privacy_sandbox/pixel/register/trigger/?id=116026588849778&ev=PageView&dl=https%3A%2F%2Fwww.harvard.edu&rl=&if=false&ts=1776360075504&sw=412&sh=823&v=2.9.298&r=stable&ec=0&o=4124&fbp=fb.1.1776360075500.641352967363707070&cs_est=true&pm=1&hrl=11f79a&ler=empty&cdl=API_unavailable&plt=416.2000000476837&ups[pv]=%7B%7D&ups[rpv]=%7B%7D&it=1776360075442&coo=false&cs_cc=1&cas=8126674360708628%2C7446479242086813%2C7309069319191122%2C7360424570702624%2C5241003475964338%2C5031144883628519%2C9423066757754499%2C6467223720019870%2C5811942942209277%2C4315512971867087&chmd=moto%20g%20power%20(2022)&chpv=11.0&chfv=undefined&dlc=1&expv2[0]=pl0&expv2[1]=el2&expv2[2]=bc1&expv2[3]=ra0&expv2[4]=rp0&expv2[5]=im1&expv2[6]=hf0&rqm=FGET — 200 — 201 B — 312 ms — h3https://www.google.com/cse/static/element/b33cba5881f68fbf/mobile_v6+en.csswww.google.com/cse/static/element/b... https://www.google.com/cse/static/element/b33cba5881f68fbf/mobile_v6+en.css — 200 — 1.5 KiB — 58 ms — h3https://cse.google.com/adsense/search/async-ads.jscse.google.com/adsense/search/async... https://cse.google.com/adsense/search/async-ads.js — 200 — 43.7 KiB — 132 ms — h2data:image/svg+xml;utf8,<svg width='24' height='24' viewBox='0 0 24 24' fill='none' xmlns='http://w…w… data:image/svg+xml;utf8,<svg width='24' height='24' viewBox='0 0 24 24' fill='none' xmlns='http://w… — 200 — 0 B — 0 ms — datahttps://www.google.com/cse/static/images/2x/en/branding.pngwww.google.com/cse/static/images/2x... https://www.google.com/cse/static/images/2x/en/branding.png — 200 — 3.3 KiB — 9 ms — h3https://clients1.google.com/generate_204clients1.google.com/generate_204 https://clients1.google.com/generate_204 — 204 — 117 B — 63 ms — h2https://analytics.google.com/g/collect?v=2&tid=G-KBLBYHG5EP&gtm=45je64f0v874580930z8836284894za20gzb836284894zd836284894&_p=1776360074878&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=896258542.1776360075&frm=0&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616986~115938466~115938469~117266400&sid=1776360075&sct=1&seg=0&dl=https%3A%2F%2Fwww.harvard.edu%2F&dt=Harvard%20University&en=page_view&_fv=1&_ss=1&ep.login_status=logged-out&ep.page_format=standard&epn.page_id=6392&ep.page_publish_date=January%2029%2C%202021&ep.page_subtype=single-page&ep.page_type=frontpage&ep.site_name=Harvard%20University&epn.document_height=15798&epn.document_width=412&up.login_status=logged-out&tfd=871analytics.google.com/g/collect?v=2&... https://analytics.google.com/g/collect?v=2&tid=G-KBLBYHG5EP&gtm=45je64f0v874580930z8836284894za20gzb836284894zd836284894&_p=1776360074878&_gaz=1&gcd=13l3l3l3l1l1&npa=0&dma=0&_eu=AAAAAGA&are=1&cid=896258542.1776360075&frm=0&pscdl=noapi&rcb=0&sr=412x823&uaa=&uab=64&uafvl=Not-A.Brand%3B24.0.0.0%7CChromium%3B146.0.7680.164&uam=moto%20g%20power%20(2022)&uamb=1&uap=Android&uapv=11.0&uaw=0&ul=en-us&gaf=2&_s=1&tag_exp=0~115616986~115938466~115938469~117266400&sid=1776360075&sct=1&seg=0&dl=https%3A%2F%2Fwww.harvard.edu%2F&dt=Harvard%20University&en=page_view&_fv=1&_ss=1&ep.login_status=logged-out&ep.page_format=standard&epn.page_id=6392&ep.page_publish_date=January%2029%2C%202021&ep.page_subtype=single-page&ep.page_type=frontpage&ep.site_name=Harvard%20University&epn.document_height=15798&epn.document_width=412&up.login_status=logged-out&tfd=871 — 204 — 550 B — 121 ms — h2https://www.google.com.br/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-KBLBYHG5EP&cid=896258542.1776360075&gtm=45je64f0v874580930z8836284894za20gzb836284894zd836284894&rcb=0&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115616986~115938466~115938469~117266400&z=778919496www.google.com.br/ads/ga-audiences?... https://www.google.com.br/ads/ga-audiences?v=1&t=sr&slf_rd=1&_r=4&tid=G-KBLBYHG5EP&cid=896258542.1776360075&gtm=45je64f0v874580930z8836284894za20gzb836284894zd836284894&rcb=0&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115616986~115938466~115938469~117266400&z=778919496 — 200 — 63 B — 124 ms — h3https://stats.g.doubleclick.net/g/collect?v=2&tid=G-KBLBYHG5EP&cid=896258542.1776360075&gtm=45je64f0v874580930z8836284894za20gzb836284894zd836284894&rcb=0&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115616986~115938466~115938469~117266400stats.g.doubleclick.net/g/collect?v... https://stats.g.doubleclick.net/g/collect?v=2&tid=G-KBLBYHG5EP&cid=896258542.1776360075&gtm=45je64f0v874580930z8836284894za20gzb836284894zd836284894&rcb=0&aip=1&dma=0&gcd=13l3l3l3l1l1&npa=0&frm=0&tag_exp=0~115616986~115938466~115938469~117266400 — 204 — 550 B — 181 ms — h2https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=afs&tv=1234567890&st=env&sjk=k7mpslKKTY+2L98yXjlqTA==&sde=1ep1.adtrafficquality.google/getconf... https://ep1.adtrafficquality.google/getconfig/sodar?sv=200&tid=afs&tv=1234567890&st=env&sjk=k7mpslKKTY+2L98yXjlqTA==&sde=1 — 200 — 8.1 KiB — 126 ms — h3https://www.harvard.edu/wp-content/uploads/2020/10/cropped-logo-branding-compressed.png?w=32www.harvard.edu/wp-content/uploads/... https://www.harvard.edu/wp-content/uploads/2020/10/cropped-logo-branding-compressed.png?w=32 — 200 — 1.1 KiB — 4 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2.jsep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2.js — 200 — 7.9 KiB — 119 ms — h2https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.htmlep2.adtrafficquality.google/sodar/s... https://ep2.adtrafficquality.google/sodar/sodar2/254/runner.html — 200 — 5.8 KiB — 63 ms — h2https://pagead2.googlesyndication.com/bg/g_oI7kvMPhEsFE8GNo1TM5ARynSo_Hn6N8zawYFyp4Y.jspagead2.googlesyndication.com/bg/g_... https://pagead2.googlesyndication.com/bg/g_oI7kvMPhEsFE8GNo1TM5ARynSo_Hn6N8zawYFyp4Y.js — 200 — 22.0 KiB — 62 ms — h3https://ep2.adtrafficquality.google/generate_204?knuhxgep2.adtrafficquality.google/generat... https://ep2.adtrafficquality.google/generate_204?knuhxg — 204 — 40 B — 5 ms — h2https://ep1.adtrafficquality.google/pagead/sodar?id=sodar2&v=254&t=2&li=afs_1234567890&jk=k7mpslKKTY%2B2L98yXjlqTA%3D%3D&bg=!VlWlVTfNAAYjKNSNAyg7AEcBe5WfOMS-_BHxS1zYKbMO5NTkp1ElW1SxbJqVqkxZLxcAGXKs_NuzDY8LE2mJhAyzIoHdLPMMWGYPMysrgwevCyBerO6uKAIAAABTUgAAAAVoAQd-ABvyaTfst-VJkcyVppzI7p0_IL78KPgTpvguq2QKASPcTkZO6z61cAvdPpt45tzfWVyDbK9ztxj800sP_b2HfIq_Cg4E4JlOxLaK0wwunyipcsCsXzR4_Mzj-VassfvXgNvspc9k7Zeo8tD1LOLDOP1SrIE_ssSyIwsgXMk-psHYa-Ob6sXx0OJz0E5GZYjgme5XKmAtpIQpsicHs6uyWQc2h8ansUdxzOxzEaKoZFuceqCdgFJJwWtVeF5JJgAoYzdFlf2OSsYGhwNivg1vl0QaF0cTf6WybhPv4gsr8NF1MikMRgjuVzgqzzoDCkNss-56sBBBSOVTXnSyH_V8xTs-RJJN0MuyjekNfXt44UJjeN7LmmsTUDxC_bqpuY7n4q0xiprkSbc41wI96fCeTEqjvjexTXbY7Cci8uTLLJXJhJqZAgIdTvrUm2hn1_GSnL1QiIpDJxtbzU_Pwc2R1JCRj8P3NwEkItqXeoLMW0GuaL_13EhOlWA-dEbGSJKEAZldwt9lzt6W7dlc9sihqvMI9CH8ux0qwXVgZMU3lW7t-aIPnVHWU0Pk34qQy1NmkJlehzT1Ne0vCVUOZT56l8EMTdDg0j-t5XijeFzvx95Cz2V-CJfUKLcT6zzUCIL9RPEtuA4eW5BReNNkx8lpao3Cck9HhxcWGvsHBv137J7cLcOEbyoyv_50xxrgT70jqMJ9Xfy3b-Amz5ievkEUOQhUNeVHlrUYPNVLkubaEJrCV-Bf_ayeGnoYJY7hVt_6Ip14xTU8uEvwrZX8JNhyIMu6kOLuj-ESy8Rziz_o4mMYQzodj6eMKJoEazhnoLIi_5uq2zw9jGgZBl_ixMrst37kbJn1PMn8Z6Cm2aMLpCzG_zsnFJMgGRJE0EhCALZINuoGyDESeNV3SndrYtGvQb03d1t7fHb7uw5nC6IemA0JPHZ3VbVIJg3FZjt_6Rtl2kB3S7jo0FZyKruInGCD2EKZr7zSFcqI6tPSF9vQYAlg_xNxd-A3Xcz0uv2tNWBAVgzRevKm6XM_S29lvXm0YiKTb5XzOLmSUzgVlh8XCrRCoREwpjvx1-ey_yCiWUVSA5BoaJJbpknXfzTFgh1KcSHJjLkVxLAUep1.adtrafficquality.google/pagead/... 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— 204 — 17 B — 111 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 3918ms · 953KB · $52/mo
www.harvard.edu
Other
Costly
Execution 1324ms
Transfer 26 KB
Monthly Cost $18/mo
Unattributable
Other
Costly
Execution 693ms
Transfer 0 KB
Monthly Cost $9/mo
Google Tag Manager
Tag Manager
Costly
Execution 306ms
Transfer 143 KB
Unused 45%
Monthly Cost $4/mo
Google Tag Manager
Tag Manager
Costly
Execution 242ms
Transfer 153 KB
Unused 42%
Monthly Cost $3/mo
www.harvard.edu
Other
Costly
Execution 226ms
Transfer 27 KB
Monthly Cost $3/mo
www.harvard.edu
Other
Costly
Execution 220ms
Transfer 161 KB
Unused 86%
Monthly Cost $3/mo
Facebook Pixel
Advertising
Optional
Execution 188ms
Transfer 96 KB
Unused 38%
Monthly Cost $2/mo
cse.google.com
Other
Optional
Execution 154ms
Transfer 4 KB
Monthly Cost $2/mo
Facebook Pixel
Advertising
Optional
Execution 149ms
Transfer 40 KB
Monthly Cost $2/mo
Google Analytics
Analytics
Optional
Execution 82ms
Transfer 21 KB
Monthly Cost $1/mo
www.google.com
Other
Optional
Execution 80ms
Transfer 99 KB
Unused 50%
Monthly Cost $1/mo
cdn.parsely.com
Other
Optional
Execution 78ms
Transfer 19 KB
Monthly Cost $1/mo
www.harvard.edu
Other
Optional
Execution 66ms
Transfer 31 KB
Unused 74%
Monthly Cost $1/mo
www.harvard.edu
Other
Optional
Execution 57ms
Transfer 90 KB
Monthly Cost $1/mo
cse.google.com
Other
Optional
Execution 53ms
Transfer 44 KB
Unused 73%
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • www.harvard.edu adds 1324ms and costs ~$18/month
  • Unattributable adds 693ms and costs ~$9/month
  • Google Tag Manager adds 306ms and costs ~$4/month
  • Google Tag Manager adds 242ms and costs ~$3/month
  • www.harvard.edu adds 226ms and costs ~$3/month
  • www.harvard.edu adds 220ms and costs ~$3/month

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

Why this matters

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

Learn more ▾

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

Source: web.dev

www.harvard.edu takes 1324ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 693ms 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 306ms 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 242ms 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.harvard.edu takes 226ms 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.harvard.edu takes 220ms 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

50% of www.google.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

74% 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

73% of cse.google.com's code is unused. The script may be loading features you don't use.

Why this matters

Bundle has high unused-code ratio — tree-shaking and route-splitting recover the wasted bytes.

Source: web.dev

How third-party costs are calculated

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

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