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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.

85

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
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-italic-latin.v13.woff286400.0 s29.9 KiB
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-display-latin.v14.woff286400.0 s28.6 KiB
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/redhat-text-latin.v13.woff286400.0 s27.6 KiB
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-700-latin.v14.woff286400.0 s17.9 KiB
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/libre-baskerville-400-latin.v14.woff286400.0 s17.4 KiB
cdn.wisc.cloud/cookie-consent/1.1.0/uwcookieconsent.min.js0.0 ms3.3 KiB
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/fonts.css86400.0 s891 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.

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
Landscape view of a golden wheat field at sunrise with sparse trees and gentle … div.uw-row > div.uw-col > div.uw-img-link > img
www.wisc.edu/images/home/south-africa-prairie.jpg551.5 KiB521.4 KiB
The Southern African Large Telescope under a starry sky with a visible Milky Wa… main#main > div#row-research > div.uw-img-wrapper > img
www.wisc.edu/images/home/salt2.webp526.7 KiB408.0 KiB
Burned tree trunks rise into the blue sky as a sunset illuminates the flowers a… div.uw-row > div.uw-col > div.uw-img-link > img
www.wisc.edu/images/home/yellowstone-sunset.jpg391.9 KiB361.8 KiB
Color-enhanced image of stem cells div.uw-row > div.uw-col > div.uw-img-link > img
www.wisc.edu/images/home/discovering-stem-cells.jpg391.4 KiB361.3 KiB
A wide view of Bascom Hill on the UW-Madison campus in spring, showing a grassy… div.uw-full-row > div.uw-col > div#uw-featured-hero > img#uw-featured-hero-img
www.wisc.edu/images/hero/bascom-hill-spring-2025-1600.jpg349.6 KiB227.2 KiB
An artist's rendering of Ice Cube's strings of photomultiplier tubes installed … div.uw-row > div.uw-col > div.uw-img-link > img
www.wisc.edu/images/home/dom-strings-blue-sky.jpg220.6 KiB190.5 KiB
UW–Madison crest logo on the side of a building with red leaves peeking into th… div#uw-news-stories > div.uw-col > a > img
www.wisc.edu/images/news/Fall-Campus-2025-10-29TW-4021_4x3-608x456.jpg115.8 KiB106.3 KiB
A color‑coded map of Wisconsin shows varying levels of social disadvantage by c… div#uw-news-stories > div.uw-col > a > img
www.wisc.edu/images/news/block-by-block-county-map-608x456.jpg97.5 KiB88.0 KiB
A student wearing a graduation gown stands next to a Bucky Badger statue while … div#uw-news-stories > div.uw-col > a > img
/images/news/Northern-Lights-2025-11-12TW-1041-1882x1411-...84.7 KiB75.2 KiB
UW red branded graphic shows the cover art for the book Custodians of Wonder --… div#uw-news-stories > div.uw-col > a > img
www.wisc.edu/images/news/2026-27-Go-Big-Read-4x3-1-608x456.jpg76.7 KiB67.2 KiB
James Patterson smiles in a school classroom div#uw-news-feature > div.uw-col > a > img
www.wisc.edu/images/news/AuthorPhoto_JP-credit-to-Emilio-Guede-Jr_-900x600.jpg95.8 KiB59.4 KiB
Three women begin to paint a colorful mural of hearts, flowers, butterflies and… div.uw-row > div.uw-col > figure.uw-caption-overlay > img
www.wisc.edu/images/home/smp-mural22.jpg?170.3 KiB34.9 KiB

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
www.wisc.edu/css/redesign.35588a9a443ae153e14a44a88430175b.css21.2 KiB109 ms
www.wisc.edu/css/uw_alerts.52f6ec0c5077e42907ca966bb4252b1e.css826 B
cdn.wisc.cloud/fonts/uw-rh-lb/0.0.1/fonts.css891 B247 ms

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

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: 563 ms
URLTime Spent
wisc.edu/563 ms
www.wisc.edu/0.0 ms

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

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: 50 ms 14.4 KiB
URLTransfer SizeEst Savings
www.wisc.edu/css/redesign.35588a9a443ae153e14a44a88430175b.css20.8 KiB14.4 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 362.0 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-D04HXCEERG&cx=c&gtm=4e64h1h1153.6 KiB107.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-TQ8DQJ4119.3 KiB65.7 KiB
www.googletagmanager.com/gtag/js?id=G-D04HXCEERG153.5 KiB63.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-N7GFX62124.2 KiB62.5 KiB
www.googletagmanager.com/gtag/js?id=G-PLJ9E3ZY82&cx=c&gtm=4e64h1h1156.0 KiB62.4 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
www.wisc.edu/images/home/south-africa-prairie.jpg552.4 KiB
www.wisc.edu/images/home/salt2.webp527.6 KiB
www.wisc.edu/images/home/terrace-chairs-rainbow.jpg484.7 KiB
www.wisc.edu/images/home/yellowstone-sunset.jpg392.7 KiB
www.wisc.edu/images/home/discovering-stem-cells.jpg392.2 KiB
www.wisc.edu/images/hero/bascom-hill-spring-2025-1600.jpg350.3 KiB
www.wisc.edu/images/admissions/capitol-rainbow-1600x940.jpg237.6 KiB
www.wisc.edu/images/home/dom-strings-blue-sky.jpg221.2 KiB
www.googletagmanager.com/gtag/js?id=G-PLJ9E3ZY82&cx=c&gtm=4e64h1h1156.1 KiB
www.googletagmanager.com/gtag/js?id=G-D04HXCEERG&cx=c&gtm=4e64h1h1153.6 KiB

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

●Max Potential First Input Delay 90 ms
●Layout shift culprits
●Optimize DOM size
●Font display
●Forced reflow
●LCP breakdown
●LCP request discovery
●Modern HTTP
●Optimize viewport for mobile
●Minify CSS
●Minify JavaScript
●User Timing marks and measures 10 user timings
●JavaScript execution time 0.2 s
●Minimizes main-thread work 0.6 s
●Avoid long main-thread tasks 2 long tasks found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 120 ms
●Server Backend Latencies 300 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 180 ms
●Avoid large layout shifts 1 layout shift found
○INP breakdown
○Avoid non-composited animations
100

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.

○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
●Form elements have associated labels
●`[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
●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.
●`[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.
●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
●Elements with visible text labels have matching accessible names.
○`[accesskey]` values are unique
○`button`, `link`, and `menuitem` elements 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
○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.
○Identical links have the same purpose.
○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.
100

Best Practices

●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 browser errors logged to the console
●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
●Page has valid source maps
○Redirects HTTP traffic to HTTPS
○Detected JavaScript libraries
100

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.

○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 have descriptive text
●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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