Lighthouse Mobile

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

SCORE

GRADE

FIX

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PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

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.

	URL	Resource Size	Est Savings
Five students sit together outside `div.paragraph > div.row > div.col-md-8 > img`	www.utoronto.ca/sites/default/files/2025-11/utogether-home-fall-2024.png	97.5 KiB	86.7 KiB
A close up of three strawberries growing in a field. `div.views-row > a.news-grid-item > span.thumbnail-wrapper > img`	/sites/default/files/styles/brand_event_307x198/public/20...	42.1 KiB	38.7 KiB
"" `div.views-row > a.news-grid-item > span.thumbnail-wrapper > img`	/sites/default/files/styles/brand_event_307x198/public/20...	41.0 KiB	37.1 KiB
Three students walk while talking to each other `div.paragraph > section.hero-banner-section > div.banner-image-wrapper > img`	/sites/default/files/styles/banner_951/public/2026-03/Uof...	42.0 KiB	34.1 KiB
"" `div.row > div.col-md-6 > a > img.image-style-focal-750x500`	/sites/default/files/styles/focal_750x500/public/2026-02/...	40.1 KiB	32.5 KiB
Three students in a composite image `a.story-wrap > div.article-image-wrap > div.story-image > img`	/sites/default/files/styles/magazine_690x500/public/2026-...	27.1 KiB	18.8 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-0-IMG

nodeLabel: Three students walk while talking to each other

path: 1,HTML,1,BODY,2,DIV,0,DIV,0,DIV,4,DIV,0,DIV,0,DIV,0,MAIN,0,SECTION,1,DIV,0,DIV,0,ARTICLE,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,SECTION,1,DIV,0,IMG

selector: div.paragraph > section.hero-banner-section > div.banner-image-wrapper > img

snippet: <img loading="eager" srcset="/sites/default/files/styles/banner_380/public/2026-03/UofT98676_0A1A6633al…" sizes="(min-width: 1400px) 1400px, 100vw" width="380" height="140" src="https://www.utoronto.ca/sites/default/files/styles/banner_951/public/2026-…" alt="Three students walk while talking to each other">

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.

URL	Transfer Size	Duration
/sites/default/files/css/css_B6J4m3qaqKTSowkFbQoBbxoKUzSu...	1.6 KiB	150 ms
/sites/default/files/css/css_-uY_Am56guxiET18sS3y-zFWF64y...	64.8 KiB	600 ms
/sites/default/files/css/css_DUjTsVGh0qSkoQzXlDANhxXQvjHH...	597 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.

Request	Cache TTL	Transfer Size
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
/p.css?s=1&k=fyb1mvy&ht=tk&f=39680.39681.39682.39683.3968...	604800.0 s	172 B
/p.css?s=1&k=cfq5pmv&ht=tk&f=39680.39681.39682.39683.3968...	604800.0 s	172 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.

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.

URL	Est Savings
www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-brands-400.woff2	15 ms
www.utoronto.ca/themes/custom/bootstrap_uoft/fa/webfonts/fa-regular-400.woff2	5.0 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: 755 ms

URL	Time Spent
utoronto.ca/	755 ms
www.utoronto.ca/	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

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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: 600 ms 86.0 KiB

URL	Transfer Size	Est Savings
/sites/default/files/css/css_-uY_Am56guxiET18sS3y-zFWF64y...	64.6 KiB	60.2 KiB
www.utoronto.ca/themes/custom/bootstrap_uoft/fa/css/all.min.css?v=1.4	26.0 KiB	25.7 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: 300 ms 303.2 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64h1	134.1 KiB	67.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZ	163.7 KiB	65.4 KiB
www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64h1	157.9 KiB	65.4 KiB
www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64h1	129.4 KiB	55.7 KiB
/sites/default/files/js/js_VCy2J6LZtIMh_H6lzqGsWvzhlseasq...	67.3 KiB	49.6 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
/sites/default/files/js/js_VCy2J6LZtIMh_H6lzqGsWvzhlseasq...	758 ms	166 ms	14 ms
www.googletagmanager.com/gtm.js?id=GTM-MFDGDNZ	270 ms	225 ms	42 ms
Unattributable	237 ms	8.9 ms	0.0 ms
www.utoronto.ca/	229 ms	102 ms	17 ms
www.googletagmanager.com/gtag/js?id=G-0X74MN6XS3&cx=c&gtm=4e64h1	229 ms	189 ms	38 ms
scripts.clarity.ms/0.8.59/clarity.js	189 ms	167 ms	6.4 ms
www.googletagmanager.com/gtag/js?id=DC-10488607&cx=c&gtm=4e64h1	179 ms	148 ms	30 ms
www.googletagmanager.com/gtag/destination?id=AW-755633847&cx=c&gtm=4e64h1	137 ms	106 ms	30 ms
js-agent.newrelic.com/nr-spa-1.313.0.min.js	122 ms	95 ms	7.2 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	1.2 s
Other	663 ms
Style & Layout	195 ms
Script Parsing & Compilation	186 ms
Rendering	69 ms
Parse HTML & CSS	64 ms
Garbage Collection	16 ms

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
Five students sit together outside `div.paragraph > div.row > div.col-md-8 > img`	www.utoronto.ca/sites/default/files/2025-11/utogether-home-fall-2024.png
Home `nav#navbar-main > div.uoft-logo > a.navbar-brand > img.img-fluid`	www.utoronto.ca/themes/custom/bootstrap_uoft/logo.svg
U of T Magazine logo `div.magazine-banner > a.row > div.magezine-logo > img`

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

●Layout shift culprits

●Optimize DOM size

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,627 KiB

●User Timing marks and measures 7 user timings

●Avoid long main-thread tasks 8 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 290 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 10 ms

○INP breakdown

○Avoid non-composited animations

○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.

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
U of T News U of T ranked first in Canada, among top 17 globally across all br… `div.paragraph > section.hero-banner-section > div.heading-wrapper > a.container`
April 20, 2026 This Toronto researcher found where memories live. Can she help … `div.container > div.view-content > div.views-row > a.news-grid-item`
April 16, 2026 Study finds evidence of stellar explosions that don't leave behi… `div.view > div.view-content > div.views-row > a.news-grid-item`
April 15, 2026 GLP-1 medicine improves liver health independent of weight loss:… `div.view > div.view-content > div.views-row > a.news-grid-item`
April 28, 2026 Dr. Marguerite (Peggy) Hill Memorial Lecture on Indigenous Health `div.container > div.view-content > div.views-row > a.news-grid-item`
April 22, 2026 Women Driving Health Innovation: Celebrating Excellence in Entre… `div.view > div.view-content > div.views-row > a.news-grid-item`
April 26, 2026 Aki (2025) Film Screening & Panel Discussion `div.view > div.view-content > div.views-row > a.news-grid-item`
U of T Celebrates The University of Toronto is home to some of the world’s top… `div.paragraph > div.celebrates-banner > div.container > a.row`
Questions about change and opportunity run throughout our first-ever student is… `div.field__item > div.paragraph > div.magazine-banner > a.row`

○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.

●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

●ARIA IDs are unique

○`[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

○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.

○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 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

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`