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https://massgeneral.org

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
3
REVIEW
5
PASS
5
INFO
2

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

Mobile Desktop
78
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
94
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
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.

1.47 s

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

2.23 s

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

52 ms

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

0.012

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

2.62 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.

2.23 s

Page Load Progression

453 ms
905 ms
1.4 s
1.8 s
2.3 s
2.7 s
3.2 s
3.6 s
Checks
15
5 PASS 5 REVIEW 3 FIX
F
Page Weight Budget
Action
3.6 MB transferred, 50 requests
FIX
3.6 MB transferred, 50 requests
Warning::
Page weighs 4.8 MB (3.6 MB transferred)
Warning::
Images are 2.9 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 2.9 MB
Info::
Fonts are 360 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 360 KB
Info::
50 HTTP requests
Info::
Estimated 0.76 g CO2 per page load
3.6 MB / 2.4 MB budget
3.6 MB transferred
50 requests
0.76 g CO2 per page load
Images 2.9 MiB 79%
Fonts 359.9 KiB 10%
JavaScript 342.3 KiB 9%
CSS 48.9 KiB 1%
HTML 20.7 KiB 1%
Other 15.1 KiB 0%
Other 5.6 KiB 0%
Other 899 B 0%
Other 318 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

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (3.6 MiB of 3.6 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
50 resources · 3.6 MB · 87 KB savings available
FIX
50 resources · 3.6 MB · 87 KB savings available
Warning::
Page weight 2.6 MB over 1MB target
Got: 3.6 MB Expected: ≤ 1 MB
Info::
~87 KB of savings available
Warning::
49 third-party resources (100% of weight)
Info::
2 resources over 200KB
50 resources · 3.6 MiB · 49 third-party 2.6 MiB over 1MB target
Image 79% · 2.9 MiB
Font 10% · 359.9 KiB
JavaScript 9% · 342.3 KiB
CSS 1% · 48.9 KiB
Document 1% · 20.7 KiB
Other 0% · 6.9 KiB

~86.7 KiB of savings available

Remove unused JavaScript: 86.7 KiB
C
Image Optimization
Action
7 images, 0 KB saveable
REVIEW
7 images, 0 KB saveable
Warning::
https://www.massgeneral.org/assets/MGH/images/logo... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.massgeneral.org/assets/MGH/images/rive... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://www.massgeneral.org/assets/MGH/images/MGH/... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
7 images 2.9 MB
0 oversized -0 KB
5 legacy format
3 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

B
JS Execution Cost
837ms total JS execution
REVIEW
837ms total JS execution
Warning::
https://d34ap6s6npht7p.cloudfront.net/cdn/js/main....: 305ms CPU time
Warning::
https://www.massgeneral.org/: 259ms CPU time
Info::
Unattributable: 157ms CPU time
Info::
https://mgb.containers.piwik.pro/41b8ae76-3079-47d...: 116ms CPU time
Warning::
Third-party scripts: 837ms (100% of total)

Main Thread Breakdown

Style & Layout 32% Script Evaluation 28% Other 27% Script Parsing & Compilation 5% Rendering 5% Parse HTML & CSS 3%
ScriptTotalScriptingParse/CompileParty
https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js305ms83ms9ms3rd
https://www.massgeneral.org/259ms6ms1ms3rd
Unattributable157ms2ms0ms3rd
https://mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js116ms90ms23ms3rd
B
JS Bundles
22 scripts, 87 KB unused
REVIEW
22 scripts, 87 KB unused
Warning::
https://d34ap6s6npht7p.cloudfront.net/cdn/js/main....: 52 KB unused (52%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://mgb.containers.piwik.pro/41b8ae76-3079-47d...: 35 KB unused (38%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 87 KB
87 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js100 KB52 KB (52%)✓3rd
https://mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js92 KB35 KB (38%)✓3rd
https://www.massgeneral.org/assets/MGH/js/22.bundle.js?ab42ae2 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/vendor.bundle.js?ab42ae3 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/29.bundle.js?ab42ae1 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/17.bundle.js?ab42ae2 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/8.bundle.js?ab42ae3 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/20.bundle.js?ab42ae2 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/23.bundle.js?ab42ae1 KB—✓3rd
https://www.massgeneral.org/assets/MGH/js/16.bundle.js?ab42ae1 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

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

Green Hosting

No green hosting detected

B
HTTP Caching
no-cache
REVIEW
no-cache
Info::
Cache-Control header is set
Got: no-cache
Info::
No ETag or Last-Modified header
Conditional requests (304 Not Modified) are not possible without validators.
Cache-Control

no-cache

DirectiveValueMeaning
no-cache—Cache but always revalidate first
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
10 fonts (360 KB)
PASS
10 fonts (360 KB)
Info::
10 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

10

360 KB total

Render-blocking

0

of 10

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 FCP 1.5 s LCP 2.2 shttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light.woff2neue-helvetica-light.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light.woff2 — 18.4 KiB — 41 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff2spectral-regular.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff2 — 79.8 KiB — 61 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff2spectral-light.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff2 — 84.8 KiB — 63 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/mgh-icons/mgh-icons.woff2mgh-icons.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/mgh-icons/mgh-icons.woff2 — 1.2 KiB — 51 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-medium.woff2neue-helvetica-medium.w... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-medium.woff2 — 18.0 KiB — 61 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-italic.woff2neue-helvetica-italic.w... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-italic.woff2 — 18.9 KiB — 60 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-bold.woff2neue-helvetica-bold.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-bold.woff2 — 12.5 KiB — 57 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light-italic.woff2neue-helvetica-light-it... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light-italic.woff2 — 18.7 KiB — 60 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-lightitalic.woff2spectral-lightitalic.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-lightitalic.woff2 — 89.8 KiB — 61 ms — font-display: swaphttps://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-roman.woff2neue-helvetica-roman.woff2 https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-roman.woff2 — 17.9 KiB — 15 ms — font-display: swap
neue-helvetica-light.woff2 woff2 swap
Size 18 KB
Load time 41 ms
Start 987 ms
Risk FOUT — text flashes from fallback to web font
spectral-regular.woff2 woff2 swap
Size 80 KB
Load time 61 ms
Start 988 ms
Risk FOUT — text flashes from fallback to web font
spectral-light.woff2 woff2 swap
Size 85 KB
Load time 63 ms
Start 990 ms
Risk FOUT — text flashes from fallback to web font
mgh-icons.woff2 woff2 swap
Size 1 KB
Load time 51 ms
Start 991 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-medium.w... woff2 swap
Size 18 KB
Load time 61 ms
Start 991 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-italic.w... woff2 swap
Size 19 KB
Load time 60 ms
Start 992 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-bold.woff2 woff2 swap
Size 12 KB
Load time 57 ms
Start 992 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-light-it... woff2 swap
Size 19 KB
Load time 60 ms
Start 992 ms
Risk FOUT — text flashes from fallback to web font
spectral-lightitalic.woff2 woff2 swap
Size 90 KB
Load time 61 ms
Start 993 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-roman.woff2 woff2 swap
Size 18 KB
Load time 15 ms
Start 1.3 s
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
50 requests over 4757ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.5 s LCP 2.2 shttps://massgeneral.org// https://massgeneral.org/ — 302 — 144 B — 379 ms — http/1.1https://www.massgeneral.org/www.massgeneral.org/ https://www.massgeneral.org/ — 200 — 20.7 KiB — 669 ms — http/1.1https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light.woff2 — 200 — 18.4 KiB — 41 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff2 — 200 — 79.8 KiB — 61 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff2 — 200 — 84.8 KiB — 63 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/mgh-icons/mgh-icons.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/mgh-icons/mgh-icons.woff2 — 200 — 1.2 KiB — 51 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-medium.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-medium.woff2 — 200 — 18.0 KiB — 61 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-italic.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-italic.woff2 — 200 — 18.9 KiB — 60 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-bold.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-bold.woff2 — 200 — 12.5 KiB — 57 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light-italic.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light-italic.woff2 — 200 — 18.7 KiB — 60 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-lightitalic.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-lightitalic.woff2 — 200 — 89.8 KiB — 61 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/css/grid.cssd34ap6s6npht7p.cloudfront.net/cdn/c... https://d34ap6s6npht7p.cloudfront.net/cdn/css/grid.css — 200 — 3.5 KiB — 29 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/css/main.cssd34ap6s6npht7p.cloudfront.net/cdn/c... https://d34ap6s6npht7p.cloudfront.net/cdn/css/main.css — 200 — 44.6 KiB — 46 ms — h2https://www.massgeneral.org/assets/MGH/images/logos/mgh-logo-rgb.svgwww.massgeneral.org/assets/MGH/imag... https://www.massgeneral.org/assets/MGH/images/logos/mgh-logo-rgb.svg — 200 — 3.9 KiB — 158 ms — http/1.1https://www.massgeneral.org/assets/MGH/js/fontloader.min.jswww.massgeneral.org/assets/MGH/js/f... https://www.massgeneral.org/assets/MGH/js/fontloader.min.js — 200 — 2.9 KiB — 238 ms — http/1.1https://www.massgeneral.org/assets/MGH/images/favicon/manifest.jsonwww.massgeneral.org/assets/MGH/imag... https://www.massgeneral.org/assets/MGH/images/favicon/manifest.json — 200 — 899 B — 337 ms — http/1.1https://fast.fonts.net/lt/1.css?apiType=css&c=72ea6c2d-4925-4118-8217-5f369f953766&fontids=5664067,5664081,5664085,5664089,5664093,5664098,5664103,5664107,5664111,5664149fast.fonts.net/lt/1.css?apiType=css... https://fast.fonts.net/lt/1.css?apiType=css&c=72ea6c2d-4925-4118-8217-5f369f953766&fontids=5664067,5664081,5664085,5664089,5664093,5664098,5664103,5664107,5664111,5664149 — 200 — 690 B — 36 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.jsd34ap6s6npht7p.cloudfront.net/cdn/j... https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js — 200 — 100.2 KiB — 15 ms — h2https://mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.jsmgb.containers.piwik.pro/41b8ae76-3... https://mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js — 200 — 92.3 KiB — 393 ms — h2https://www.massgeneral.org/assets/MGH/js/vendor.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/v... https://www.massgeneral.org/assets/MGH/js/vendor.bundle.js?ab42ae — 200 — 2.6 KiB — 105 ms — http/1.1https://www.massgeneral.org/assets/MGH/js/29.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/2... https://www.massgeneral.org/assets/MGH/js/29.bundle.js?ab42ae — 200 — 1.2 KiB — 104 ms — http/1.1https://www.massgeneral.org/assets/MGH/js/17.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/1... https://www.massgeneral.org/assets/MGH/js/17.bundle.js?ab42ae — 200 — 2.1 KiB — 187 ms — http/1.1https://www.massgeneral.org/assets/MGH/js/8.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/8... https://www.massgeneral.org/assets/MGH/js/8.bundle.js?ab42ae — 200 — 2.8 KiB — 208 ms — http/1.1data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' height='9.13' width='61'…www.w3.org/2000/svg' height='9.13' ... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' height='9.13' width='61'… — 200 — 0 B — 0 ms — datadata:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='50' height='37'%3…www.w3.org/2000/svg' width='50' hei... data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='50' height='37'%3… — 200 — 0 B — 0 ms — datahttps://www.massgeneral.org/assets/MGH/js/20.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/2... https://www.massgeneral.org/assets/MGH/js/20.bundle.js?ab42ae — 200 — 1.5 KiB — 123 ms — 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0 ms 1.0 s 2.0 s 3.0 s 4.0 s FCP 1.5 s LCP 2.2 shttps://massgeneral.org// https://massgeneral.org/ — 302 — 144 B — 379 ms — http/1.1https://www.massgeneral.org/www.massgeneral.org/ https://www.massgeneral.org/ — 200 — 20.7 KiB — 669 ms — http/1.1https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-light.woff2 — 200 — 18.4 KiB — 41 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff2 — 200 — 79.8 KiB — 61 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff2 — 200 — 84.8 KiB — 63 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 837ms · 213KB · $11/mo
d34ap6s6npht7p.cloudfront.net
Other
Costly
Execution 305ms
Transfer 100 KB
Unused 52%
Monthly Cost $4/mo
www.massgeneral.org
Other
Costly
Execution 259ms
Transfer 21 KB
Monthly Cost $3/mo
Unattributable
Other
Optional
Execution 157ms
Transfer 0 KB
Monthly Cost $2/mo
mgb.containers.piwik.pro
Other
Optional
Execution 116ms
Transfer 92 KB
Unused 38%
Monthly Cost $2/mo

These scripts may cost more than they're worth

  • d34ap6s6npht7p.cloudfront.net adds 305ms and costs ~$4/month
  • www.massgeneral.org adds 259ms 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.

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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

d34ap6s6npht7p.cloudfront.net takes 305ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

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

Source: web.dev

52% of d34ap6s6npht7p.cloudfront.net's code is unused. The script may be loading features you don't use.

Why this matters

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

Source: web.dev

www.massgeneral.org takes 259ms 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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