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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.

64

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
/homepage/_imgs/video-loops/UC_Irvine_Homepage_Earth_Week...0.0 ms13.0 MiB
/homepage/_imgs/video-loops/UC_Irvine_Homepage_Earth_Week...0.0 ms799.2 KiB
uci.edu/homepage/_imgs/visit-04.jpg0.0 ms662.7 KiB
uci.edu/_assets/img/home/visit-01.jpg0.0 ms648.6 KiB
uci.edu/_assets/img/home/visit-02.jpg0.0 ms584.4 KiB
uci.edu/homepage/_imgs/visit-05.jpg0.0 ms473.5 KiB
uci.edu/_assets/img/home/visit-03.jpg0.0 ms432.1 KiB
uci.edu/_assets/img/home/time-lapse.jpg0.0 ms394.6 KiB
uci.edu/homepage/_imgs/community-background-athletics.jpg0.0 ms372.7 KiB
uci.edu/homepage/_imgs/community-background-arts.jpg0.0 ms323.8 KiB
uci.edu/_assets/css/main.css0.0 ms308.6 KiB
uci.edu/homepage/_imgs/best-in-class.jpg0.0 ms168.3 KiB
uci.edu/homepage/_imgs/features_imgs/20241123_114351-Ali-Martin.jpg0.0 ms148.0 KiB
uci.edu/homepage/news/1-hero-basia.jpg0.0 ms112.6 KiB
uci.edu/_assets/img/home/uci-health.jpg0.0 ms112.1 KiB
uci.edu/_assets/img/home/research.png0.0 ms110.8 KiB
uci.edu/_assets/img/home/community-athletics.png0.0 ms110.0 KiB
uci.edu/_assets/img/home/community-arts.png0.0 ms84.6 KiB
uci.edu/_assets/img/home/campus-life.jpg0.0 ms83.4 KiB
uci.edu/homepage/_imgs/features_imgs/240910_airportfire_00573_sz-720x480.jpg0.0 ms75.9 KiB
uci.edu/_assets/img/home/samueli-college.jpg0.0 ms68.5 KiB
uci.edu/_assets/img/home/admissions-and-aid.jpg0.0 ms63.7 KiB
uci.edu/homepage/news/3researchers-768x465.jpg0.0 ms61.3 KiB
uci.edu/_assets/js/vendor.js0.0 ms54.7 KiB
uci.edu/homepage/_imgs/features_imgs/Thwaites-720x480.jpg0.0 ms51.1 KiB
uci.edu/_assets/js/main.js0.0 ms48.4 KiB
uci.edu/_assets/img/home/academics.jpg0.0 ms48.0 KiB
uci.edu/homepage/_imgs/features_imgs/241119_Bartell_06434_sz-720x480.jpg0.0 ms38.0 KiB
uci.edu/homepage/news/Monica-Majoli-headshot-720x480.jpg0.0 ms37.2 KiB
uci.edu/_assets/img/branding/seal.svg0.0 ms19.9 KiB
uci.edu/_assets/img/branding/anteater.svg0.0 ms16.8 KiB
siteimproveanalytics.com/js/siteanalyze_8343.js86400.0 s41.0 KiB
uci.edu/_assets/img/mask/brushstroke.svg0.0 ms16.4 KiB
uci.edu/_assets/img/svg/decorative/UCI25-HPBA-Blue_8B-econ.svg0.0 ms6.6 KiB
uci.edu/_assets/js/plugins/modernizr.js0.0 ms5.7 KiB
uci.edu/_assets/img/svg/decorative/UCI25-HPBA-Blue_Top-10.svg0.0 ms5.4 KiB
uci.edu/_assets/img/svg/decorative/UCI25-HPBA-Blue_best-value.svg0.0 ms4.8 KiB
uci.edu/_assets/css/60th-Yellow.svg0.0 ms3.6 KiB
uci.edu/_assets/img/svg/decorative/UCI25-HPBA-Blue_CMI-2.svg0.0 ms3.5 KiB
uci.edu/_assets/js/cookie-banner.js0.0 ms1.1 KiB
uci.edu/_assets/js/home.js0.0 ms860 B
uci.edu/_assets/css/scpa-min.css0.0 ms703 B
uci.edu/_assets/js/scpa-min.js0.0 ms591 B

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
div.wrapper > section.hero > figure.hero__background > video#hero-video div.wrapper > section.hero > figure.hero__background > video#hero-video
/homepage/_imgs/video-loops/UC_Irvine_Homepage_Earth_Week...798.1 KiB608.2 KiB
The Wildlife-Urban Interface Climate Network brings partners and communities to… div.hero__feature-list > div#news-campuses-tribes-community-groups-and-land-managers-unite-in-uc-funded-climate-action-network > figure.card__figure > img.card__image
uci.edu/homepage/_imgs/features_imgs/20241123_114351-Ali-Martin.jpg147.6 KiB139.6 KiB
Best in Class div.wrapper > section#section-3 > figure.rankings__image > img
uci.edu/homepage/_imgs/best-in-class.jpg167.9 KiB94.0 KiB
Bridging Urban America filmmakers Basia and Leonard Myszynski discussing aerial… div.feed__item > div#news-basia-myszynski-78-explores-ethics-technology-and-human-truth-through-documentary-filmmaking > figure.card__figure > img.card__image
uci.edu/homepage/news/1-hero-basia.jpg112.2 KiB91.5 KiB
One of the most pressing concerns in Southern California currently is the incre… div.hero__feature-list > div#news-uc-irvine-faces-climate-change-challenges-with-interdisciplinary-approach-external-partnerships > figure.card__figure > img.card__image
uci.edu/homepage/_imgs/features_imgs/240910_airportfire_00573_sz-720x480.jpg75.5 KiB67.6 KiB
A man in laboratory attire is looking into the lens of a microscope. div.wrapper > section#section-1 > figure.research__image > img
uci.edu/_assets/img/home/research.png110.4 KiB53.1 KiB
Woman are performing a dance in front of an audience. In the front of the pictu… div.explore__item > div.explore__card > figure.explore__figure > img
uci.edu/_assets/img/home/campus-life.jpg83.0 KiB51.0 KiB
A photo taken in early January shows aggressive iceberg calving at the front of… div.hero__feature-list > div#news-antarctica-has-lost-10-times-the-size-of-greater-los-angeles-in-ice-over-30-years > figure.card__figure > img.card__image
uci.edu/homepage/_imgs/features_imgs/Thwaites-720x480.jpg50.7 KiB42.8 KiB
UC Irvine researchers (from left) Dr. An Do, associate professor of neurology; … div.feed__item > div#news-uc-irvine-led-study-achieves-brain-controlled-walking-with-artificial-sensory-feedback > figure.card__figure > img.card__image
uci.edu/homepage/news/3researchers-768x465.jpg61.0 KiB38.1 KiB
A female student is smiling as she looks down to her laptop, as she has her han… div.explore__item > div.explore__card > figure.explore__figure > img
uci.edu/_assets/img/home/admissions-and-aid.jpg63.4 KiB31.3 KiB
Monica Majoli is among 61 Guggenheim Fellows at UC Irvine from various backgrou… div.feed__item > div#news-monica-majoli-is-named-a-2026-guggenheim-fellow > figure.card__figure > img.card__image
uci.edu/homepage/news/Monica-Majoli-headshot-720x480.jpg36.9 KiB21.5 KiB
Scott Bartell, professor of environmental and occupational health and a lead in… div.hero__feature-list > div#news-an-earth-day-lesson-in-forever-chemicals-with-scott-bartell > figure.card__figure > img.card__image
uci.edu/homepage/_imgs/features_imgs/241119_Bartell_06434_sz-720x480.jpg37.7 KiB20.7 KiB
A male student is dressed in blue gloves and a blue lab coat, doing an experime… div.explore__item > div.explore__card > figure.explore__figure > img
uci.edu/_assets/img/home/academics.jpg47.7 KiB15.6 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-0-VIDEO
nodeLabel: div.wrapper > section.hero > figure.hero__background > video#hero-video
path: 1,HTML,1,BODY,4,MAIN,0,DIV,0,SECTION,1,FIGURE,1,VIDEO
selector: div.wrapper > section.hero > figure.hero__background > video#hero-video
snippet: <video autoplay="autoplay" id="hero-video" loop="loop" muted="muted" playsinline="playsinline" poster="https://uci.edu/homepage/_imgs/video-loops/UC_Irvine_Homepage_Earth_Week_V…" preload="auto">

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
uci.edu/_assets/css/main.css308.6 KiB655 ms
uci.edu/_assets/js/plugins/modernizr.js5.7 KiB
uci.edu/_assets/js/scpa-min.js591 B
uci.edu/_assets/css/scpa-min.css703 B
fonts.googleapis.com/css2?family=Roboto+Slab:wght@300;400;700&display=swap1.2 KiB275 ms
cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.1/css/all.min.css16.9 KiB327 ms
/css2?family=Hepta+Slab:wght@1..900&family=Montserrat:ita...838 B62 ms

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.

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

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: 440 ms 261.8 KiB
URLTransfer SizeEst Savings
uci.edu/_assets/css/main.css308.0 KiB245.6 KiB
cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.1/css/all.min.css16.3 KiB16.2 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 108.7 KiB
URLTransfer SizeEst Savings
uci.edu/_assets/css/main.css308.6 KiB108.7 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 228.3 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtag/js?id=G-WZF0XCWWWK&cx=c&gtm=4e64h1150.7 KiB65.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-M2P2J94122.4 KiB64.7 KiB
uci.edu/_assets/js/vendor.js54.3 KiB39.0 KiB
uci.edu/_assets/js/main.js48.0 KiB37.4 KiB
code.jquery.com/jquery-3.7.1.min.js29.6 KiB21.6 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
/homepage/_imgs/video-loops/UC_Irvine_Homepage_Earth_Week...13.0 MiB
/homepage/_imgs/video-loops/UC_Irvine_Homepage_Earth_Week...799.2 KiB
uci.edu/homepage/_imgs/visit-04.jpg662.7 KiB
uci.edu/_assets/img/home/visit-01.jpg648.6 KiB
uci.edu/_assets/img/home/visit-02.jpg584.4 KiB
uci.edu/homepage/_imgs/visit-05.jpg473.5 KiB
uci.edu/_assets/img/home/visit-03.jpg432.1 KiB
uci.edu/_assets/img/home/time-lapse.jpg394.6 KiB
uci.edu/homepage/_imgs/community-background-athletics.jpg372.7 KiB
uci.edu/homepage/_imgs/community-background-arts.jpg323.8 KiB

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

●Layout shift culprits
●Optimize DOM size
●Font display
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Max Potential First Input Delay 20 ms
●Minify JavaScript
●User Timing marks and measures 5 user timings
●JavaScript execution time 0.1 s
●Minimizes main-thread work 0.7 s
●Avoid non-composited animations 1 animated element found
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 180 ms
●Server Backend Latencies 170 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Avoid multiple page redirects
●Initial server response time was short Root document took 350 ms
○INP breakdown
○Avoid long main-thread tasks
○Avoid large layout shifts
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
●`[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
●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
●`<video>` elements contain a `<track>` element with `[kind="captions"]`
●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 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
○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.
○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
○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.
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 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
91

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
uci.edu/research/index.phpLearn more
/2024/09/24/uc-irvine-is-ranked-among-nations-top-10-publ...Learn More
uci.edu/community/index.phpLearn More
/2025/06/27/uc-irvine-ranks-fourth-in-princeton-reviews-b...Learn More
/2025/02/20/uc-irvine-rates-among-best-universities-in-ca...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
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○robots.txt is valid
○Document has a valid `rel=canonical`

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