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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.

53

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
/root/styles/wms-focal-md__600x600_/public/article-thumb-...1209600.0 s363.8 KiB
www.mcgill.ca/root/css/css_Bn4VZCSfwKVWH9WNeCdIiPE3w4Jj12aatoF8FAKh6s4.css1209600.0 s357.6 KiB
/root/styles/wms-focal-md__600x600_/public/article-thumb-...1209600.0 s318.1 KiB
/root/styles/wms-focal-md__600x600_/public/article-thumb-...1209600.0 s299.6 KiB
www.mcgill.ca/root/hp-branding-region-feb2026.jpg1209600.0 s135.7 KiB
www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js1209600.0 s124.8 KiB
/TSbd/08278c8957ab20008f450f507c89366583300b801129042e3bd...86400.0 s16.1 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/line-awesome.8f27b776.woff21209600.0 s44.9 KiB
www.mcgill.ca/root/js/js_NLLXow_P0hT3RGJwt-tDxP0HFx4QVqYa_W5YKdBxYuQ.js1209600.0 s42.3 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/videoModalComponent.6edef453.js1209600.0 s36.3 KiB
www.mcgill.ca/root/js/js_UnUAFCNTGurRKyhNy7N72Mv86IdtFGAwSpI4omffLWM.js1209600.0 s29.2 KiB
i.ytimg.com/vi_webp/cuuMf7hp3PU/default.webp7200.0 s3.4 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSerif-Regular.2fe60a11.woff1209600.0 s20.8 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSans-Medium.0097ee5d.woff1209600.0 s18.6 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSans-Regular.7ac71b20.woff1209600.0 s17.8 KiB
www.mcgill.ca/root/js/js_sKgv6N06ZXl7RRvcUx-suoQVx2G5PYixfnzMdNUDTA4.js1209600.0 s16.2 KiB
www.mcgill.ca/root/css/css_looQZWPtU0KMpC8YUe3IHSZC3kjAKRYs_9c6_Oc8Das.css1209600.0 s14.6 KiB
www.mcgill.ca/root/js/js_SvFAI8iewe7Ipse2GW7N9TMIrfgiVPH7c090khnScTY.js1209600.0 s12.8 KiB
www.mcgill.ca/root/css/css_mOjEzhnZs70DEg5v8YulEWPgPuML4lqo4FjybA8itz0.css1209600.0 s11.2 KiB
/sites/all/themes/coltrane19/dist/mcgill-logo-red-reverse...1209600.0 s9.8 KiB
/ytc/AIdro_mVl6I7KwCsQGcV_oAyYdeONfj2iytB-44tXvWMxjX3lxw=...86400.0 s2.3 KiB
www.mcgill.ca/root/js/js_N23fS6ooC-uvOJ2j7mtuBbVQeGAvoXnACb9oAiqrOPE.js1209600.0 s9.1 KiB
www.mcgill.ca/root/css/css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css1209600.0 s8.2 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/coltrane.js?td3xfi1209600.0 s7.2 KiB
www.mcgill.ca/root/js/js_RulCPHj8aUtatsXPqRSFtJIhBjBSAzFXZzADEVD4CHY.js1209600.0 s4.7 KiB
www.mcgill.ca/root/js/js_v7jDIMUEcN6BBNPa3HVRFvCSboKsSIXuOKzG8_3BWlc.js1209600.0 s4.0 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/drupalYTPlayerAPI.aaa0ed5d.js1209600.0 s2.3 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/search_icon-white.82d33785.svg1209600.0 s2.1 KiB
i.ytimg.com/vi_webp/cuuMf7hp3PU/default.webp7200.0 s0 B
i.ytimg.com/vi_webp/cuuMf7hp3PU/default.webp7200.0 s0 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]
items: [map[node:map[type:text value:Total] score:0.25588800000000006] map[node:map[boundingRect:map[bottom:924 height:225 left:0 right:1350 top:699 width:1350] lhId:page-6-DIV nodeLabel:Enter your keywords path:1,HTML,1,BODY,1,DIV,0,DIV,3,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,2,DIV selector:div.content > div#node-24 > div.content > div#search-feature-container snippet:<div id="search-feature-container"> type:node] score:0.196113 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1469 height:354 left:112 right:466 top:1115 width:354] lhId:page-1-IMG nodeLabel:Two people wearing sunglasses and tuques smiling at the camera path:1,HTML,1,BODY,1,DIV,0,DIV,3,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,3,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.field > div.field-items > div.field-item > img.no-float snippet:<img class="no-float" src="https://www.mcgill.ca/root/styles/wms-focal-md__600x600_/public/article-th…" width="600" height="600" alt="Two people wearing sunglasses and tuques smiling at the camera"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:0 height:0 left:0 right:0 top:0 width:0] lhId:page-5-IFRAME nodeLabel:Video of Anthem video ENG NS path:1,HTML,1,BODY,28,DIV,0,DIV,1,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,IFRAME selector:div#file-83 > div.content > div.media-youtube-video > iframe#media-youtube-cuumf7hp3pu snippet:<iframe class="media-youtube-player" id="media-youtube-cuumf7hp3pu" width="900" height="390" src="https://www.youtube-nocookie.com/embed/cuuMf7hp3PU?wmode=opaque&amp;controls=&amp;…" name="Anthem video ENG NS" frameborder="0" allowfullscreen=""> type:node] score:0.025013] map[node:map[boundingRect:map[bottom:1469 height:354 left:112 right:466 top:1115 width:354] lhId:page-1-IMG nodeLabel:Two people wearing sunglasses and tuques smiling at the camera path:1,HTML,1,BODY,1,DIV,0,DIV,3,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,3,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.field > div.field-items > div.field-item > img.no-float snippet:<img class="no-float" src="https://www.mcgill.ca/root/styles/wms-focal-md__600x600_/public/article-th…" width="600" height="600" alt="Two people wearing sunglasses and tuques smiling at the camera"> type:node] score:0.019367 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1469 height:354 left:112 right:466 top:1115 width:354] lhId:page-1-IMG nodeLabel:Two people wearing sunglasses and tuques smiling at the camera path:1,HTML,1,BODY,1,DIV,0,DIV,3,DIV,0,DIV,0,DIV,0,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,3,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.field > div.field-items > div.field-item > img.no-float snippet:<img class="no-float" src="https://www.mcgill.ca/root/styles/wms-focal-md__600x600_/public/article-th…" width="600" height="600" alt="Two people wearing sunglasses and tuques smiling at the camera"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:940 height:414 left:1050 right:1350 top:526 width:300] lhId:page-11-DIV nodeLabel:We use cookies to help improve the usability of our websites. What are you com… path:1,HTML,1,BODY,25,DIV selector:body.html > div#sliding-popup snippet:<div id="sliding-popup" style="bottom: 0px;" class="sliding-popup-bottom"> type:node] score:0.000672] map[node:map[boundingRect:map[bottom:940 height:414 left:1050 right:1350 top:526 width:300] lhId:page-11-DIV nodeLabel:We use cookies to help improve the usability of our websites. What are you com… path:1,HTML,1,BODY,25,DIV selector:body.html > div#sliding-popup snippet:<div id="sliding-popup" style="bottom: 0px;" class="sliding-popup-bottom"> type:node] score:0.000529]]

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.mcgill.ca/sites/all/themes/coltrane19/dist/line-awesome.8f27b776.woff2205 ms
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSerif-Regular.2fe60a11.woff120 ms
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSans-Regular.7ac71b20.woff115 ms
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSans-Medium.0097ee5d.woff115 ms
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff240 ms

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:12.223 source:map[column:29670 line:2 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.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:92.891 source:map[type:text value:[unattributed]]] map[reflowTime:0.35 source:map[column:41 line:1054 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:8.451 source:map[column:51393 line:1 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:0.284 source:map[column:50673 line:1 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:0.2 source:map[column:50731 line:1 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:0.426 source:map[column:50793 line:1 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:0.112 source:map[column:54258 line:1 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:1.865 source:map[column:85293 line:1 type:source-location url:https://www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js urlProvider:network]] map[reflowTime:0.535 source:map[column:200 line:11 type:source-location url:https://www.mcgill.ca/sites/all/themes/coltrane19/dist/coltrane.js?td3xfi urlProvider:network]]]

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
A woman and a man smiling div.field > div.field-items > div.field-item > img.no-float
/root/styles/wms-focal-md__600x600_/public/article-thumb-...362.9 KiB342.5 KiB
Two people wearing sunglasses and tuques smiling at the camera div.field > div.field-items > div.field-item > img.no-float
/root/styles/wms-focal-md__600x600_/public/article-thumb-...317.3 KiB296.8 KiB
Person smiling at camera div.field > div.field-items > div.field-item > img.no-float
/root/styles/wms-focal-md__600x600_/public/article-thumb-...298.8 KiB278.3 KiB
Arts Building Cupola on McGill campus. div.field-items > div.field-item > p > img.media-element
www.mcgill.ca/root/hp-branding-region-feb2026.jpg134.8 KiB95.0 KiB

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.mcgill.ca/http/1.1
www.mcgill.ca/root/css/css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.csshttp/1.1
www.mcgill.ca/root/css/css_mOjEzhnZs70DEg5v8YulEWPgPuML4lqo4FjybA8itz0.csshttp/1.1
www.mcgill.ca/root/css/css_looQZWPtU0KMpC8YUe3IHSZC3kjAKRYs_9c6_Oc8Das.csshttp/1.1
www.mcgill.ca/root/css/css_Bn4VZCSfwKVWH9WNeCdIiPE3w4Jj12aatoF8FAKh6s4.csshttp/1.1
www.mcgill.ca/root/hp-branding-region-feb2026.jpghttp/1.1
/root/styles/wms-focal-md__600x600_/public/article-thumb-...http/1.1
/root/styles/wms-focal-md__600x600_/public/article-thumb-...http/1.1
/root/styles/wms-focal-md__600x600_/public/article-thumb-...http/1.1
/TSbd/08278c8957ab20008f450f507c89366583300b801129042e3bd...http/1.1
www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.jshttp/1.1
www.mcgill.ca/root/js/js_RulCPHj8aUtatsXPqRSFtJIhBjBSAzFXZzADEVD4CHY.jshttp/1.1
www.mcgill.ca/root/js/js_SvFAI8iewe7Ipse2GW7N9TMIrfgiVPH7c090khnScTY.jshttp/1.1
www.mcgill.ca/root/js/js_sKgv6N06ZXl7RRvcUx-suoQVx2G5PYixfnzMdNUDTA4.jshttp/1.1
www.mcgill.ca/root/js/js_NLLXow_P0hT3RGJwt-tDxP0HFx4QVqYa_W5YKdBxYuQ.jshttp/1.1
www.mcgill.ca/root/js/js_N23fS6ooC-uvOJ2j7mtuBbVQeGAvoXnACb9oAiqrOPE.jshttp/1.1
www.mcgill.ca/root/js/js_UnUAFCNTGurRKyhNy7N72Mv86IdtFGAwSpI4omffLWM.jshttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/coltrane.js?td3xfihttp/1.1
www.mcgill.ca/root/js/js_v7jDIMUEcN6BBNPa3HVRFvCSboKsSIXuOKzG8_3BWlc.jshttp/1.1
/sites/all/themes/coltrane19/dist/mcgill-logo-red-reverse...http/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/search_icon-white.82d33785.svghttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSans-Regular.7ac71b20.woffhttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSans-Medium.0097ee5d.woffhttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/McGillSerif-Regular.2fe60a11.woffhttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/line-awesome.8f27b776.woff2http/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/drupalYTPlayerAPI.aaa0ed5d.jshttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/dist/videoModalComponent.6edef453.jshttp/1.1
www.mcgill.ca/sites/all/themes/coltrane19/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

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.mcgill.ca/root/css/css_Bn4VZCSfwKVWH9WNeCdIiPE3w4Jj12aatoF8FAKh6s4.css357.6 KiB1.5 s
www.mcgill.ca/root/css/css_looQZWPtU0KMpC8YUe3IHSZC3kjAKRYs_9c6_Oc8Das.css14.6 KiB562 ms
www.mcgill.ca/root/css/css_mOjEzhnZs70DEg5v8YulEWPgPuML4lqo4FjybA8itz0.css11.2 KiB423 ms
www.mcgill.ca/root/css/css_xE-rWrJf-fncB6ztZfd2huxqgxu4WO-qwma6Xer30m4.css8.2 KiB146 ms

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

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

ElementLayout shift score
Enter your keywords div.content > div#node-24 > div.content > div#search-feature-container
0.196
Video of Anthem video ENG NS div#file-83 > div.content > div.media-youtube-video > iframe#media-youtube-cuumf7hp3pu
0.025
Two people wearing sunglasses and tuques smiling at the camera div.field > div.field-items > div.field-item > img.no-float
0.019
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.001
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.001
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.001
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.001
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000
We use cookies to help improve the usability of our websites. What are you com… body.html > div#sliding-popup
0.000

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: 240 ms 355.3 KiB
URLTransfer SizeEst Savings
www.mcgill.ca/root/css/css_Bn4VZCSfwKVWH9WNeCdIiPE3w4Jj12aatoF8FAKh6s4.css356.8 KiB332.0 KiB
www.mcgill.ca/root/css/css_looQZWPtU0KMpC8YUe3IHSZC3kjAKRYs_9c6_Oc8Das.css13.7 KiB12.9 KiB
www.mcgill.ca/root/css/css_mOjEzhnZs70DEg5v8YulEWPgPuML4lqo4FjybA8itz0.css10.4 KiB10.4 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: 40 ms 117.0 KiB
URLTransfer SizeEst Savings
www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js124.0 KiB44.1 KiB
www.mcgill.ca/sites/all/themes/coltrane19/dist/videoModalComponent.6edef453.js35.5 KiB25.0 KiB
www.mcgill.ca/root/js/js_UnUAFCNTGurRKyhNy7N72Mv86IdtFGAwSpI4omffLWM.js28.3 KiB24.0 KiB
www.mcgill.ca/root/js/js_NLLXow_P0hT3RGJwt-tDxP0HFx4QVqYa_W5YKdBxYuQ.js41.4 KiB23.9 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 45.1 KiB
URLTransfer SizeEst Savings
www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js124.0 KiB28.2 KiB
www.mcgill.ca/root/js/js_UnUAFCNTGurRKyhNy7N72Mv86IdtFGAwSpI4omffLWM.js28.3 KiB9.6 KiB
www.mcgill.ca/root/js/js_N23fS6ooC-uvOJ2j7mtuBbVQeGAvoXnACb9oAiqrOPE.js8.2 KiB3.2 KiB
www.mcgill.ca/root/js/js_RulCPHj8aUtatsXPqRSFtJIhBjBSAzFXZzADEVD4CHY.js3.8 KiB2.1 KiB
www.mcgill.ca/root/js/js_SvFAI8iewe7Ipse2GW7N9TMIrfgiVPH7c090khnScTY.js12.0 KiB2.0 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.youtube-nocookie.com/s/player/57fefa84/player_embed_es6.vflset/en_US/base.js433.2 KiB
/root/styles/wms-focal-md__600x600_/public/article-thumb-...363.8 KiB
www.mcgill.ca/root/css/css_Bn4VZCSfwKVWH9WNeCdIiPE3w4Jj12aatoF8FAKh6s4.css357.6 KiB
/root/styles/wms-focal-md__600x600_/public/article-thumb-...318.1 KiB
/root/styles/wms-focal-md__600x600_/public/article-thumb-...299.6 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.I-saIP3mOa8.2021...207.3 KiB
www.mcgill.ca/root/hp-branding-region-feb2026.jpg135.7 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.I-saIP3mOa8.2021...130.4 KiB
www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js124.8 KiB
www.youtube-nocookie.com/s/player/57fefa84/www-player.css57.0 KiB

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

●Document request latency
●Optimize DOM size
●LCP breakdown
●Optimize viewport for mobile
●Max Potential First Input Delay 20 ms
●Minify CSS
●JavaScript execution time 0.1 s
●Minimizes main-thread work 0.5 s
●Image elements have explicit `width` and `height`
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 100 ms
●Server Backend Latencies 60 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 120 ms
○INP breakdown
○LCP request discovery
○User Timing marks and measures
○Avoid long main-thread tasks
○Avoid non-composited animations
88

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
In an emergency div.field-item > ul > li > h4

These are opportunities to improve keyboard navigation in your application.

Internationalization and localization

If a page doesn't specify a `lang` attribute, a screen reader assumes that the page is in the default language that the user chose when setting up the screen reader. If the page isn't actually in the default language, then the screen reader might not announce the page's text correctly. Learn more about the `lang` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.js html.js

These are opportunities to improve the interpretation of your content by users in different locales.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Admissions div#block-menu-menu-global-menu > div.content > ul.menu > li.first
Research div#block-menu-menu-global-menu > div.content > ul.menu > li.expanded
Student life div#block-menu-menu-global-menu > div.content > ul.menu > li.expanded
Why Montreal div#block-menu-menu-global-menu > div.content > ul.menu > li.expanded
About McGill div#block-menu-menu-global-menu > div.content > ul.menu > li.last

These are opportunities to improve the experience of reading tabular or list data using assistive technology, like a screen reader.

Best practices

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.js html.js

These items highlight common accessibility best practices.

○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-hidden="true"]` is not present on the document `<body>`
●`[role]`s have all required `[aria-*]` attributes
●`[role]` values are valid
●Buttons have an accessible name
●Image elements have `[alt]` attributes
●Input buttons have discernible text.
●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.
●`button`, `link`, and `menuitem` elements have accessible names
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<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>`).
●No element has a `[tabindex]` value greater than 0
●Touch targets have sufficient size and spacing.
●`[lang]` attributes have a valid value
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
●Identical links have the same purpose.
○`[accesskey]` values are unique
○`[aria-*]` attributes match their roles
○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
○ARIA input fields have accessible names
○ARIA `meter` elements have accessible names
○ARIA `progressbar` elements have accessible names
○Elements use only permitted ARIA attributes
○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
○`[aria-*]` attributes have valid values
○`[aria-*]` attributes are valid and not misspelled
○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 type="image">` elements have `[alt]` text
○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.
○`<video>` elements contain a `<track>` element with `[kind="captions"]`
○Tables have different content in the summary attribute and `<caption>`.
○All heading elements contain content.
○Image elements do not have `[alt]` attributes that are redundant text.
○Elements with visible text labels have matching accessible names.
○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
www.mcgill.ca/
The source list for the Content Security Policy directive 'frame-src' contains an invalid source: 'ms-appx-web://'. It will be ignored.
about:blank
The source list for the Content Security Policy directive 'frame-src' contains an invalid source: 'ms-appx-web://'. It will be ignored.
www.mcgill.ca/root/js/js_G8UCeLS2V3_kmKnBUDyyePWz6JTaxtx9x2_FgJzC_Cs.js line 1, col 48672
The source list for the Content Security Policy directive 'frame-src' contains an invalid source: 'ms-appx-web://'. It will be ignored.
●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
●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
○Use a strong HSTS policy
○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

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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
●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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