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https://massgeneral.org

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
85
GRADE
B
FIX
2
REVIEW
6
PASS
7
INFO
2

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

Mobile Desktop
32
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
88
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.
85
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.

4.40 s

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

7.03 s

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

688 ms

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

0.323

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

4.81 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.

9.41 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 6 REVIEW 2 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 (1.2 MiB of 1.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
JS Execution Cost
Action
2440ms total JS execution
FIX
2440ms total JS execution
Warning::
https://d34ap6s6npht7p.cloudfront.net/cdn/js/main....: 694ms CPU time
Warning::
https://www.massgeneral.org/: 494ms CPU time
Warning::
https://mgb.containers.piwik.pro/41b8ae76-3079-47d...: 441ms CPU time
Warning::
Unattributable: 318ms CPU time
Info::
https://www.massgeneral.org/assets/MGH/js/3.bundle...: 217ms CPU time
Warning::
Third-party scripts: 2440ms (100% of total)

Main Thread Breakdown

Script Evaluation 45% Other 21% Style & Layout 16% Script Parsing & Compilation 7% Parse HTML & CSS 6% Rendering 4%
ScriptTotalScriptingParse/CompileParty
https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js694ms325ms29ms3rd
https://www.massgeneral.org/494ms38ms6ms3rd
https://mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js441ms339ms88ms3rd
Unattributable318ms7ms0ms3rd
https://www.massgeneral.org/assets/MGH/js/3.bundle.js?ab42ae217ms160ms15ms3rd
https://cdn.callrail.com/companies/763824717/7f48cebc793bc5770b5c/12/swap.js168ms143ms25ms3rd
https://d34ap6s6npht7p.cloudfront.net/cdn/css/main.css56ms0ms0ms3rd
https://mgb.containers.piwik.pro/ppms.js52ms43ms8ms3rd
B
Page Weight Budget
1.2 MB transferred, 46 requests
REVIEW
1.2 MB transferred, 46 requests
Info::
Page weighs 2.3 MB (1.2 MB transferred)
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::
46 HTTP requests
Info::
Estimated 0.24 g CO2 per page load
1.2 MB / 2.4 MB budget
1.2 MB transferred
46 requests
0.24 g CO2 per page load
Images 385.9 KiB 33%
Fonts 360.0 KiB 31%
JavaScript 342.2 KiB 29%
CSS 48.9 KiB 4%
HTML 20.7 KiB 2%
Other 15.1 KiB 1%
Other 5.6 KiB 0%
Other 899 B 0%
Other 318 B 0%
0 2.4 MB 4.9 MB
Under budget

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

B
Image Optimization
4 images, 0 KB saveable
REVIEW
4 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::
is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
4 images 386 KB
0 oversized -0 KB
2 legacy format
2 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

Performance issues directly impact user engagement and conversion rates.

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

B
Page Weight Inventory
46 resources · 1.2 MB · 87 KB savings available
REVIEW
46 resources · 1.2 MB · 87 KB savings available
Warning::
Page weight 156 KB over 1MB target
Got: 1.2 MB Expected: ≤ 1 MB
Info::
~87 KB of savings available
Warning::
45 third-party resources (100% of weight)
Info::
1 resources over 200KB
46 resources · 1.2 MiB · 45 third-party 155.6 KiB over 1MB target
Image 34% · 400.9 KiB
Font 31% · 360.0 KiB
JavaScript 29% · 342.2 KiB
CSS 4% · 48.9 KiB
Document 2% · 20.7 KiB
Other 1% · 6.9 KiB

~86.6 KiB of savings available

Remove unused JavaScript: 86.6 KiB
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 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.4 s LCP 7.0 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 — 121 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 — 154 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 — 179 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 — 112 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 — 18.1 KiB — 158 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 — 179 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 — 158 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 — 192 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 — 195 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 — 35 ms — font-display: swap
neue-helvetica-light.woff2 woff2 swap
Size 18 KB
Load time 121 ms
Start 912 ms
Risk FOUT — text flashes from fallback to web font
spectral-regular.woff2 woff2 swap
Size 80 KB
Load time 154 ms
Start 914 ms
Risk FOUT — text flashes from fallback to web font
spectral-light.woff2 woff2 swap
Size 85 KB
Load time 179 ms
Start 915 ms
Risk FOUT — text flashes from fallback to web font
mgh-icons.woff2 woff2 swap
Size 1 KB
Load time 112 ms
Start 915 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-medium.w... woff2 swap
Size 18 KB
Load time 158 ms
Start 918 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-italic.w... woff2 swap
Size 19 KB
Load time 179 ms
Start 919 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-bold.woff2 woff2 swap
Size 12 KB
Load time 158 ms
Start 919 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-light-it... woff2 swap
Size 19 KB
Load time 192 ms
Start 919 ms
Risk FOUT — text flashes from fallback to web font
spectral-lightitalic.woff2 woff2 swap
Size 90 KB
Load time 195 ms
Start 919 ms
Risk FOUT — text flashes from fallback to web font
neue-helvetica-roman.woff2 woff2 swap
Size 18 KB
Load time 35 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
13 hints, 0 missing preconnects
PASS
13 hints, 0 missing preconnects
Info::
Page uses 13 resource hint(s)

Current Resource Hints

preconnect
4
preload
9
dns-prefetch
—
prefetch
—

13 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
46 requests over 2214ms
INFO
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.4 s LCP 7.0 shttps://massgeneral.org// https://massgeneral.org/ — 302 — 144 B — 347 ms — http/1.1https://www.massgeneral.org/www.massgeneral.org/ https://www.massgeneral.org/ — 200 — 20.7 KiB — 610 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 — 121 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 — 154 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 — 179 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 — 112 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 — 18.1 KiB — 158 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 — 179 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 — 158 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 — 192 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 — 195 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 — 131 ms — h2https://d34ap6s6npht7p.cloudfront.net/cdn/css/main.cssd34ap6s6npht7p.cloudfront.net/cdn/c... https://d34ap6s6npht7p.cloudfront.net/cdn/css/main.css — 200 — 44.7 KiB — 128 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 — 131 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 — 216 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 — 289 ms — http/1.1https://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 — 63 ms — h2https://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 — 46 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 — 430 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 — 111 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 — 109 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 — 106 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 — 206 ms — http/1.1https://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 — 205 ms — http/1.1data: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/23.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/2... https://www.massgeneral.org/assets/MGH/js/23.bundle.js?ab42ae — 200 — 1.4 KiB — 188 ms — http/1.1https://www.massgeneral.org/assets/MGH/images/_global/homepage/curry-william-600x538-v5.pngwww.massgeneral.org/assets/MGH/imag... https://www.massgeneral.org/assets/MGH/images/_global/homepage/curry-william-600x538-v5.png — 200 — 382.0 KiB — 522 ms — http/1.1https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-roman.woff2d34ap6s6npht7p.cloudfront.net/cdn/f... https://d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-roman.woff2 — 200 — 17.9 KiB — 35 ms — h2https://www.massgeneral.org/assets/MGH/js/16.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/1... https://www.massgeneral.org/assets/MGH/js/16.bundle.js?ab42ae — 200 — 1.4 KiB — 114 ms — http/1.1https://www.massgeneral.org/assets/MGH/js/22.bundle.js?ab42aewww.massgeneral.org/assets/MGH/js/2... https://www.massgeneral.org/assets/MGH/js/22.bundle.js?ab42ae — 200 — 1.6 KiB — 151 ms — http/1.1
0 ms 1.0 s 2.0 s 3.0 s 4.0 s 5.0 s 6.0 s 7.0 s FCP 4.4 s LCP 7.0 shttps://massgeneral.org// https://massgeneral.org/ — 302 — 144 B — 347 ms — http/1.1https://www.massgeneral.org/www.massgeneral.org/ https://www.massgeneral.org/ — 200 — 20.7 KiB — 610 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 — 121 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 — 154 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 — 179 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 2440ms · 364KB · $32/mo
d34ap6s6npht7p.cloudfront.net
Other
Costly
Execution 694ms
Transfer 100 KB
Unused 52%
Monthly Cost $9/mo
www.massgeneral.org
Other
Costly
Execution 494ms
Transfer 21 KB
Monthly Cost $7/mo
mgb.containers.piwik.pro
Other
Costly
Execution 441ms
Transfer 92 KB
Unused 38%
Monthly Cost $6/mo
Unattributable
Other
Costly
Execution 318ms
Transfer 0 KB
Monthly Cost $4/mo
www.massgeneral.org
Other
Costly
Execution 217ms
Transfer 40 KB
Monthly Cost $3/mo
cdn.callrail.com
Other
Optional
Execution 168ms
Transfer 40 KB
Monthly Cost $2/mo
d34ap6s6npht7p.cloudfront.net
Other
Optional
Execution 56ms
Transfer 45 KB
Monthly Cost $1/mo
mgb.containers.piwik.pro
Other
Optional
Execution 52ms
Transfer 26 KB
Monthly Cost $1/mo

These scripts may cost more than they're worth

  • d34ap6s6npht7p.cloudfront.net adds 694ms and costs ~$9/month
  • www.massgeneral.org adds 494ms and costs ~$7/month
  • mgb.containers.piwik.pro adds 441ms and costs ~$6/month
  • Unattributable adds 318ms and costs ~$4/month
  • www.massgeneral.org adds 217ms 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

d34ap6s6npht7p.cloudfront.net takes 694ms 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 494ms 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

mgb.containers.piwik.pro takes 441ms 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 318ms 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.massgeneral.org takes 217ms 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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