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· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.
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Detailed Report

Audit breakdown by category with detailed findings.

78

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

RequestCache TTLTransfer Size
/assets/MGH/images/_global/homepage/curry-william-1400x12...0.0 ms1.8 MiB
/assets/MGH/images/_global/homepage/scott-shannon-testimo...0.0 ms942.0 KiB
d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js0.0 ms100.2 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-lightitalic.woff20.0 ms89.8 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff20.0 ms84.8 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff20.0 ms79.8 KiB
www.massgeneral.org/assets/MGH/images/MGH/res-inno-megamenu400x225.jpg0.0 ms66.7 KiB
d34ap6s6npht7p.cloudfront.net/cdn/css/main.css0.0 ms44.6 KiB
www.massgeneral.org/assets/MGH/js/3.bundle.js?ab42ae0.0 ms40.3 KiB
www.massgeneral.org/assets/MGH/images/river-shield-400x225.jpg0.0 ms34.9 KiB
cdn.callrail.com/companies/763824717/7f48cebc793bc5770b5c/12/swap.js3600.0 s39.5 KiB
/cdn/fonts/neue-helvetica/neue-helvetica-italic.woff20.0 ms18.9 KiB
/cdn/fonts/neue-helvetica/neue-helvetica-light-italic.woff20.0 ms18.7 KiB
/cdn/fonts/neue-helvetica/neue-helvetica-light.woff20.0 ms18.4 KiB
/cdn/fonts/neue-helvetica/neue-helvetica-medium.woff20.0 ms18.0 KiB
/cdn/fonts/neue-helvetica/neue-helvetica-roman.woff20.0 ms17.9 KiB
mgb.containers.piwik.pro/ppms.js21600.0 s26.0 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/neue-helvetica/neue-helvetica-bold.woff20.0 ms12.5 KiB
www.massgeneral.org/assets/MGH/images/logos/mgh-logo-rgb.svg0.0 ms3.9 KiB
d34ap6s6npht7p.cloudfront.net/cdn/css/grid.css0.0 ms3.5 KiB
www.massgeneral.org/assets/MGH/js/fontloader.min.js0.0 ms2.9 KiB
www.massgeneral.org/assets/MGH/js/8.bundle.js?ab42ae0.0 ms2.8 KiB
www.massgeneral.org/assets/MGH/js/vendor.bundle.js?ab42ae0.0 ms2.6 KiB
www.massgeneral.org/assets/MGH/js/17.bundle.js?ab42ae0.0 ms2.1 KiB
www.massgeneral.org/assets/MGH/js/22.bundle.js?ab42ae0.0 ms1.6 KiB
www.massgeneral.org/assets/MGH/js/5.bundle.js?ab42ae0.0 ms1.6 KiB
www.massgeneral.org/assets/MGH/js/20.bundle.js?ab42ae0.0 ms1.5 KiB
www.massgeneral.org/assets/MGH/js/27.bundle.js?ab42ae0.0 ms1.5 KiB
www.massgeneral.org/assets/MGH/js/16.bundle.js?ab42ae0.0 ms1.4 KiB
www.massgeneral.org/assets/MGH/js/23.bundle.js?ab42ae0.0 ms1.4 KiB
www.massgeneral.org/assets/MGH/js/9.bundle.js?ab42ae0.0 ms1.4 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/mgh-icons/mgh-icons.woff20.0 ms1.2 KiB
munchkin.marketo.net/munchkin.js0.0 ms1.2 KiB
www.massgeneral.org/assets/MGH/js/29.bundle.js?ab42ae0.0 ms1.2 KiB
www.massgeneral.org/assets/MGH/js/18.bundle.js?ab42ae0.0 ms1.0 KiB
/lt/1.css?apiType=css&c=72ea6c2d-4925-4118-8217-5f369f953...1.0 s690 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:91.808 source:map[column:38999 line:2 type:source-location url:https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js urlProvider:network]]]
headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]
items: [map[reflowTime:91.808 source:map[column:51954 line:1 type:source-location url:https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js urlProvider:network]] map[reflowTime:15.887 source:map[column:1858 line:0 type:source-location url:https://www.massgeneral.org/assets/MGH/js/vendor.bundle.js?ab42ae urlProvider:network]] map[reflowTime:156.977 source:map[type:text value:[unattributed]]] map[reflowTime:20.423 source:map[column:1526 line:0 type:source-location url:https://www.massgeneral.org/assets/MGH/js/20.bundle.js?ab42ae urlProvider:network]] map[reflowTime:15.482 source:map[column:3448 line:0 type:source-location url:https://www.massgeneral.org/assets/MGH/js/22.bundle.js?ab42ae urlProvider:network]] map[reflowTime:19.139 source:map[column:92460 line:1 type:source-location url:https://d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js urlProvider:network]] map[reflowTime:0.123 source:map[column:198810 line:6 type:source-location url:https://mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js urlProvider:network]]]

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLProtocol
www.massgeneral.org/http/1.1
www.massgeneral.org/assets/MGH/images/logos/mgh-logo-rgb.svghttp/1.1
www.massgeneral.org/assets/MGH/js/fontloader.min.jshttp/1.1
www.massgeneral.org/assets/MGH/images/favicon/manifest.jsonhttp/1.1
www.massgeneral.org/assets/MGH/js/vendor.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/29.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/17.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/8.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/20.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/23.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/16.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/22.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/5.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/3.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/18.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/27.bundle.js?ab42aehttp/1.1
www.massgeneral.org/assets/MGH/js/9.bundle.js?ab42aehttp/1.1
/assets/MGH/images/_global/homepage/curry-william-1400x12...http/1.1
www.massgeneral.org/assets/MGH/json/centers.jsonhttp/1.1
www.massgeneral.org/assets/MGH/images/river-shield-400x225.jpghttp/1.1
www.massgeneral.org/assets/MGH/images/MGH/res-inno-megamenu400x225.jpghttp/1.1
/assets/MGH/images/_global/homepage/scott-shannon-testimo...http/1.1
www.massgeneral.org/assets/MGH/images/favicon/favicon.icohttp/1.1

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.
title: Preconnected origins
description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.
title: Preconnect candidates
value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer SizeDuration
d34ap6s6npht7p.cloudfront.net/cdn/css/main.css44.6 KiB84 ms
/lt/1.css?apiType=css&c=72ea6c2d-4925-4118-8217-5f369f953...690 B226 ms
d34ap6s6npht7p.cloudfront.net/cdn/css/grid.css3.5 KiB209 ms

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLResource SizeEst Savings
Staff at Mass General are ready to assist you. div.hero-area__image > div.hero-image > div.hero-image__image > img.absolute-full
/assets/MGH/images/_global/homepage/curry-william-1400x12...1.8 MiB1.6 MiB
Dr. Shannon Stott and Dr. Jessica Wallace div#iw_comp1563765926165 > div.testimonial > div.testimonial__image > img.lazyloaded
/assets/MGH/images/_global/homepage/scott-shannon-testimo...941.8 KiB808.2 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 80 ms 35.9 KiB
URLTransfer SizeEst Savings
d34ap6s6npht7p.cloudfront.net/cdn/css/main.css44.3 KiB35.9 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 40 ms 86.7 KiB
URLTransfer SizeEst Savings
d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js99.9 KiB51.8 KiB
mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js92.0 KiB34.9 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLTransfer Size
/assets/MGH/images/_global/homepage/curry-william-1400x12...1.8 MiB
/assets/MGH/images/_global/homepage/scott-shannon-testimo...942.0 KiB
d34ap6s6npht7p.cloudfront.net/cdn/js/main.min.js100.2 KiB
mgb.containers.piwik.pro/41b8ae76-3079-47d5-aaf8-040ee367d152.js92.3 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-lightitalic.woff289.8 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-light.woff284.8 KiB
d34ap6s6npht7p.cloudfront.net/cdn/fonts/spectral/spectral-regular.woff279.8 KiB
www.massgeneral.org/assets/MGH/images/MGH/res-inno-megamenu400x225.jpg66.7 KiB
d34ap6s6npht7p.cloudfront.net/cdn/css/main.css44.6 KiB
www.massgeneral.org/assets/MGH/js/3.bundle.js?ab42ae40.3 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
Mass General building with the U.S. News and World Report "Best Hospitals Honor… div.main-nav-col__inner > div.main-nav-col__content > figure.main-nav-col__figure > img.lazyloaded
www.massgeneral.org/assets/MGH/images/river-shield-400x225.jpg
Research Innovation div.main-nav-col__inner > div.main-nav-col__content > figure.main-nav-col__figure > img.lazyloaded
www.massgeneral.org/assets/MGH/images/MGH/res-inno-megamenu400x225.jpg
Massachusetts General Hospital logo div.col-8 > div.global-header__logo > a > img
www.massgeneral.org/assets/MGH/images/logos/mgh-logo-rgb.svg

More information about the performance of your application. These numbers don't directly affect the Performance score.

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 425 ms
URLTime Spent
massgeneral.org/425 ms
www.massgeneral.org/0.0 ms
●Time to Interactive 2.2 s
●Max Potential First Input Delay 90 ms
●Layout shift culprits
●Optimize DOM size
●Font display
●LCP breakdown
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●JavaScript execution time 0.2 s
●Minimizes main-thread work 1.0 s
●Avoid long main-thread tasks 3 long tasks found
●Avoid non-composited animations 21 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 80 ms
●Server Backend Latencies 80 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 280 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○LCP request discovery
○User Timing marks and measures
94

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
U.S. News Honor Roll Hospital div.hero-area > div.proof-point > div.proof-point__statement > h3
Gambling Addiction: How to Recognize a Problem and Get Help ul > li > div.listing-item > h4.listing-item__title

These are opportunities to improve keyboard navigation in your application.

Names and labels

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.row > div.col-12 > div.global-footer__address > a div.row > div.col-12 > div.global-footer__address > a

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Targeted Therapy Improves Long-Term Outcomes for Patients with Rare Mutations D… li > div.listing-item > h4.listing-item__title > a
Long Dismissed in Adult Health, the Thymus May Be Critical for Longevity and Ca… li > div.listing-item > h4.listing-item__title > a
Sean M. Healey & AMG Center for ALS Announces Design with Keros Therapeutics fo… li > div.listing-item > h4.listing-item__title > a
Explore research at Mass General div.testimonial__text--container > div.testimonial__text > div.testimonial__cta > a.button
Gambling Addiction: How to Recognize a Problem and Get Help li > div.listing-item > h4.listing-item__title > a
What Causes Obesity? li > div.listing-item > h4.listing-item__title > a
Driving Progress in Patient Transfers to Expand Access to Care li > div.listing-item > h4.listing-item__title > a
Learn more div.row > div.col-12 > div.homepage-pillars__pillar > a.button
Learn more div.row > div.col-12 > div.homepage-pillars__pillar > a.button
Learn more div.row > div.col-12 > div.homepage-pillars__pillar > a.button
Quality & Safety at Mass General div.homepage-featured-pages > div.homepage-featured-pages__inner > div.homepage-featured-pages__page > a
FIND A LOCATION nav.global-footer__nav > ul > li.global-footer__link > a
CONTACT US nav.global-footer__nav > ul > li.global-footer__link > a
○Interactive controls are keyboard focusable
○Interactive elements indicate their purpose and state
○The page has a logical tab order
○Visual order on the page follows DOM order
○User focus is not accidentally trapped in a region
○The user's focus is directed to new content added to the page
○HTML5 landmark elements are used to improve navigation
○Offscreen content is hidden from assistive technology
○Custom controls have associated labels
○Custom controls have ARIA roles
●`[aria-*]` attributes match their roles
●`[aria-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●ARIA attributes are used as specified for the element's role
●`[aria-hidden="true"]` elements do not contain focusable descendents
●Elements use only permitted ARIA attributes
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links are distinguishable without relying on color.
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●Touch targets have sufficient size and spacing.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements have accessible names
○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
○`[role]`s are contained by their required parent element
○Elements with the `role=text` attribute do not have focusable descendents.
○ARIA toggle fields have accessible names
○ARIA `tooltip` elements have accessible names
○ARIA `treeitem` elements have accessible names
○The page contains a heading, skip link, or landmark region
○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
○Definition list items are wrapped in `<dl>` elements
○ARIA IDs are unique
○No form fields have multiple labels
○`<frame>` or `<iframe>` elements have a title
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○Input buttons have discernible text.
○`<input type="image">` elements have `[alt]` text
○Form elements have associated labels
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○No element has a `[tabindex]` value greater than 0
○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
○`[lang]` attributes have a valid value
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Uses ARIA roles only on compatible elements
○Image elements do not have `[alt]` attributes that are redundant text.
○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.
○`<td>` elements in a large `<table>` have one or more table headers.
96

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Description
Failed to evaluate tag - Filter: Search Field Submit (new): Cannot read properties of null (reading 'addEventListener')
●Uses HTTPS
●Avoids deprecated APIs
●Avoids third-party cookies
●Allows users to paste into input fields
●Avoids requesting the geolocation permission on page load
●Avoids requesting the notification permission on page load
●Displays images with correct aspect ratio
●Serves images with appropriate resolution
●Page has the HTML doctype
●Properly defines charset
●No issues in the `Issues` panel in Chrome Devtools
●Ensure CSP is effective against XSS attacks
●Use a strong HSTS policy
●Ensure proper origin isolation with COOP
●Mitigate clickjacking with XFO or CSP
●Mitigate DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
92

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destinationLink Text
www.massgeneralbrigham.org/en/about/newsroom/articles/us-news-2025Learn more
www.massgeneralbrigham.org/en/about/newsroom/articles/parkinsons-disease-vs-msRead more
www.massgeneral.org/researchLearn more
www.massgeneral.org/educationLearn more
www.massgeneral.org/community-healthLearn more
www.massgeneral.org/locationsLearn More
www.youtube.com/watch?v=4ElY-RyFMlQLearn More
www.massgeneral.org/quality-and-safetyLearn More

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid
●Page isn’t blocked from indexing
●Document has a `<title>` element
●Document has a meta description
●Page has successful HTTP status code
●Links are crawlable
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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