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Lighthouse Desktop

· 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.

89

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.

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
Jean Bennett and Albert Maguire div.news-featured__featured > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/hero/public/2026-04/Bennett-M...686.5 KiB651.7 KiB
Gender Symbols div.upcoming-events__grid > article.event-card > a.event-card__image-link > img.event-card__image
/sites/default/files/styles/event_large/public/2018-05/iS...145.8 KiB122.4 KiB
Cross section rendering of human kidneys div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/kidney-...130.2 KiB119.8 KiB
An iceberg in Iceland. div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/iceberg...104.9 KiB94.5 KiB
istock art of digital learning div.upcoming-events__grid > article.event-card > a.event-card__image-link > img.event-card__image
/sites/default/files/styles/event_large/public/2020-12/iS...103.8 KiB80.4 KiB
A latex-gloved hand hoding a petri dish of medical chewing gum. div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/daniell...83.8 KiB73.4 KiB
Lingjie Liu from penn grasp lab div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/IMG_199...68.4 KiB58.0 KiB
graduate research student working in thermal architecture lab at pennovation ce… main#content > div.featured-story > picture > img.featured-story__image
/sites/default/files/styles/crop_2x1/public/2026-04/therm...65.1 KiB18.8 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-8-SECTION
nodeLabel: ARTS & HUMANITIES The performing arts at Penn: process, practice, and purpose
path: 1,HTML,1,BODY,0,DIV,5,MAIN,0,SECTION
selector: body.node-31 > div#top > main#content > section.hero-homepage
snippet: <section class="hero-homepage hero hero--text-left background--center-center " data-hero="hero1">

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
value: no origins were preconnected
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
/css?family=EB+Garamond|Roboto:400,400i,500,700,700i&disp...2.5 KiB275 ms
/sites/default/files/css/css_YXG-48C9dItYo_-1cLQAXLW5nY-m...49.7 KiB80 ms
/sites/default/files/css/css_YLWp88qbpiivAKlZryznBSp52Spe...1.4 KiB
www.upenn.edu/modules/contrib/google_tag/js/gtm.js?tduwqx899 B
/sites/default/files/js/js_Qb5Hf6mJBtGliJ8jbrJRJyzFCu9df9...536 B
www.upenn.edu/modules/contrib/google_tag/js/gtag.js?tduwqx987 B

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
www.google-analytics.com/analytics.js7200.0 s20.9 KiB

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.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLEst Savings
www.upenn.edu/themes/custom/penn_global/assets/dist/fonts/slick.woff5.0 ms

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: 0.0 ms 40.5 KiB
URLTransfer SizeEst Savings
/sites/default/files/css/css_YXG-48C9dItYo_-1cLQAXLW5nY-m...49.5 KiB40.5 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: 0.0 ms 155.1 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64h1151.6 KiB62.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-5X34LWC136.9 KiB62.0 KiB
/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZ...49.7 KiB30.2 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
/sites/default/files/styles/hero/public/2026-04/Bennett-M...687.1 KiB
www.upenn.edu/themes/custom/penn_global/assets/img//footer-16.png191.1 KiB
/sites/default/files/styles/teaser/public/2026-04/P-10185...166.9 KiB
/sites/default/files/styles/teaser/public/2026-03/iran-wa...154.2 KiB
/sites/default/files/styles/teaser/public/2026-04/P-10210...153.8 KiB
www.googletagmanager.com/gtag/js?id=G-LL85393RFV&cx=c&gtm=4e64h1151.6 KiB
/sites/default/files/styles/event_large/public/2018-05/iS...146.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-5X34LWC137.2 KiB
/sites/default/files/styles/teaser/public/2026-04/P-10090...135.4 KiB
/sites/default/files/styles/teaser/public/2026-03/sidegig...134.0 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
Twitter icon ul.social__list > li.social__item > a.social__link > img.social__icon
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-threads.svg
Gender Symbols div.upcoming-events__grid > article.event-card > a.event-card__image-link > img.event-card__image
/sites/default/files/styles/event_large/public/2018-05/iS...
istock art of digital learning div.upcoming-events__grid > article.event-card > a.event-card__image-link > img.event-card__image
/sites/default/files/styles/event_large/public/2020-12/iS...
Jean Bennett and Albert Maguire div.news-featured__featured > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/hero/public/2026-04/Bennett-M...
University of Pennsylvania div.contain > div.footer__columns > div.footer__column > img.footer__logo
www.upenn.edu/themes/custom/penn_starter/assets/img/UPenn-logo.svg
A latex-gloved hand hoding a petri dish of medical chewing gum. div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/daniell...
An iceberg in Iceland. div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/iceberg...
Cross section rendering of human kidneys div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/kidney-...
Lingjie Liu from penn grasp lab div.news-featured__articles > article.article-card > picture.article-card__figure > img.article-card__image
/sites/default/files/styles/teaser/public/2026-04/IMG_199...
Flickr icon ul.social__list > li.social__item > a.social__link > img.social__icon
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-flickr.svg
YouTube icon ul.social__list > li.social__item > a.social__link > img.social__icon
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-youtube.svg
LinkedIn icon ul.social__list > li.social__item > a.social__link > img.social__icon
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-linkedin.svg
Threads div.social-card__wrap > div.social-card__footer > span.social-card__icon > img
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-threads-white.svg
Facebook icon ul.social__list > li.social__item > a.social__link > img.social__icon
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-facebook.svg
Instagram div.social-card__wrap > div.social-card__footer > span.social-card__icon > img
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram-white.svg
Instagram div.social-card__wrap > div.social-card__footer > span.social-card__icon > img
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram-white.svg
Instagram icon ul.social__list > li.social__item > a.social__link > img.social__icon
www.upenn.edu/themes/custom/penn_global/assets/img/svg/icon-instagram.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: 202 ms
URLTime Spent
upenn.edu/202 ms
www.upenn.edu/0.0 ms
●Time to Interactive 2.0 s
●Layout shift culprits
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 60 ms
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 7 user timings
●JavaScript execution time 0.2 s
●Minimizes main-thread work 0.5 s
●Avoid long main-thread tasks 1 long task found
●Avoid non-composited animations 14 animated elements found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 20 ms
●Server Backend Latencies 50 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 0 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
95

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.

ARIA

Some ARIA parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
ACADEMICS More Academics ADMISSIONS & AID ATHLETICS RESEARCH & INNOVATION More … header#header > div#headerMenus > nav#primary-navigation > ul.nav__menu

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

○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]`s are contained by their required parent element
●`[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 have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●Heading elements appear in a sequentially-descending order
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Identical links have the same purpose.
●Elements with visible text labels have matching accessible names.
○`[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 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
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○Select elements have associated label elements.
○Skip links are focusable.
○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.

SourceDescription
/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZ... line 26, col 272
TypeError: Cannot read properties of undefined (reading 'textarea_bgcolor') at Object.attach (https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE:27:273) at https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE:7:427 at Array.forEach (<anonymous>) at Drupal.attachBehaviors (https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE:7:353) at https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE:8:373 at HTMLDocument.listener (https://www.upenn.edu/sites/default/files/js/js_D-zhZ1_IbEPvTFtT74PECVxlOcb5FZQ7HFRn53yQCoI.js?scope=footer&delta=1&language=en&theme=penn_starter&include=eJx9ikEKhTAMBS9k7ZFCTMuzGhtpCurt_wdX3bh5jxkGZtBMnRHxnwkjz7zxPcpjOnOtJHtOpVuLAwVZuSKHBWJq7SslTomux8v1gETZ_a2htrDG94JLK2f3H0rIQYE:8:161)
●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 DOM-based XSS with Trusted Types
●Detected JavaScript libraries
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Mitigate clickjacking with XFO or CSP
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
/news/thermal-architecture-lab-beating-heat-designing-coo...LEARN MORE
university-communications.upenn.edu/federal-government-updatesLEARN MORE
/announcements/penns-title-ix-resolution-us-department-ed...LEARN 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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