Lighthouse Desktop

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

SCORE

GRADE

FIX

REVIEW

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.

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
/vi/V1ggffYdjzU/maxresdefault.jpg?sqp=-oaymwEmCIAKENAF8qu...	7200.0 s	80.9 KiB
cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.js	86400.0 s	103.0 KiB
www.tcd.ie/media/tcd/site-assets/scripts/jquery-3.5.1.min.js	0.0 ms	30.6 KiB
www.tcd.ie/media/tcd/site-assets/style/20220428-tcd-style.css	0.0 ms	29.7 KiB
www.tcd.ie/media/tcd/site-assets/fonts/source-sans-pro-latin-regular.woff2	0.0 ms	16.1 KiB
www.tcd.ie/media/tcd/site-assets/fonts/open-sans-latin-700.woff2	0.0 ms	15.1 KiB
www.tcd.ie/media/tcd/site-assets/fonts/open-sans-latin-regular.woff2	0.0 ms	14.4 KiB
www.tcd.ie/media/tcd/site-assets/scripts/tiny-slider.min.js	0.0 ms	12.9 KiB
www.tcd.ie/media/tcd/site-assets/images/tcd-logo.png	0.0 ms	10.6 KiB
cdn.cookielaw.org/logos/static/ot_company_logo.png	86400.0 s	19.1 KiB
www.tcd.ie/media/tcd/site-assets/scripts/global-20220428.js	0.0 ms	7.4 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
www.tcd.ie/media/tcd/site-assets/scripts/van11y-accessible-tab-panel-aria.min.js	0.0 ms	2.5 KiB
www.tcd.ie/media/tcd/site-assets/scripts/emergency.js	0.0 ms	2.4 KiB
www.tcd.ie/media/tcd/site-assets/scripts/emergency-micro.js	0.0 ms	2.3 KiB
www.tcd.ie/media/tcd/site-assets/scripts/ofi.min.js	0.0 ms	1.8 KiB
www.tcd.ie/media/tcd/site-assets/scripts/focus-visible.min.js	0.0 ms	1.4 KiB
www.tcd.ie/media/tcd/site-assets/images/Instagram.svg	0.0 ms	1.3 KiB
www.tcd.ie/media/tcd/site-assets/images/youtube.svg	0.0 ms	1.1 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.5 KiB
www.tcd.ie/media/tcd/site-assets/images/x-logo.svg	0.0 ms	829 B
www.tcd.ie/media/tcd/site-assets/scripts/t4-updates.js	0.0 ms	790 B
www.tcd.ie/media/tcd/site-assets/images/linkedin.svg	0.0 ms	700 B
www.tcd.ie/media/tcd/site-assets/images/facebook.svg	0.0 ms	695 B
static.doubleclick.net/instream/ad_status.js	900.0 s	494 B
cdn.cookielaw.org/logos/static/ot_close.svg	86400.0 s	620 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
fonts.gstatic.com/s/roboto/v48/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	30 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:20.818 source:map[column:69646 line:7 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.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:17.126 source:map[type:text value:[unattributed]]] map[reflowTime:0.182 source:map[column:87592 line:1 type:source-location url:https://www.tcd.ie/media/tcd/site-assets/scripts/jquery-3.5.1.min.js urlProvider:network]] map[reflowTime:14.83 source:map[column:349419 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:0.761 source:map[column:349763 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.js urlProvider:network]] map[reflowTime:5.227 source:map[column:161470 line:6 type:source-location url:https://cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.js 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.

	URL	Resource Size	Est Savings
AI and the idea of a University `ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image`	www.trumba.com/i/DgALofSC2uXdgIYr-0%2ACwWat.png	2.9 MiB	2.9 MiB
Frontsquare TCD `div.banner > div.banner__inner > div.banner__image > img`	/fit-in/1500x9999/filters:no_upscale()/filters:format(web...	406.7 KiB	307.8 KiB
From Lab to Lasting Impact: Engaging Audiences with Research `ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image`	www.trumba.com/i/DgBvYPNi1ryfntQXbnEewTJW.jpg	141.5 KiB	127.6 KiB
ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image `ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	112.0 KiB	96.7 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	105.1 KiB	86.7 KiB
ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image `ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	88.8 KiB	73.1 KiB
ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image `ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	79.6 KiB	64.0 KiB
div.row > div.card__sub-items > div.card__item--one > img.card__image `div.row > div.card__sub-items > div.card__item--one > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	78.7 KiB	63.6 KiB
div.row > div.card__sub-items > div.card__item--two > img.card__image `div.row > div.card__sub-items > div.card__item--two > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	73.8 KiB	63.4 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	79.9 KiB	61.5 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	79.5 KiB	61.1 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	76.3 KiB	57.9 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	63.1 KiB	44.7 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	/fit-in/500x9999/filters:format(webp)/filters:quality(100...	62.6 KiB	44.2 KiB
National Spring Clean `ul.news-events-list__inner > li.news-events-list__item > a.news-events-list__link > img.news-events-list__item-image`	www.trumba.com/i/DgAwEE7nAIqYokAtzwbaF6Vt.jpg	36.4 KiB	20.1 KiB
Trinity College Dublin, the University of Dublin `div.row > div.site-header__site-logo > a > img`	www.tcd.ie/media/tcd/site-assets/images/tcd-logo.png	10.2 KiB	7.1 KiB
div.container > div.row > div.card__item > img.card__image `div.container > div.row > div.card__item > img.card__image`	pxl-tcdie.terminalfour.net/prod01/channel_3/media/tcd/homepage/image-f-(2).jpg	42.7 KiB	5.6 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-1-IMG

nodeLabel: Frontsquare TCD

path: 1,HTML,1,BODY,7,MAIN,0,DIV,0,DIV,0,DIV,0,IMG

selector: div.banner > div.banner__inner > div.banner__image > img

snippet: <img sizes="100vw" srcset="https://pxl-tcdie.terminalfour.net/fit-in/480x9999/filters:no_upscale()/fi…" src="https://pxl-tcdie.terminalfour.net/fit-in/1500x9999/filters:no_upscale()/f…" alt="Frontsquare TCD" height="450">

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.

URL	Transfer Size	Duration
www.tcd.ie/media/tcd/site-assets/style/20220428-tcd-style.css	29.7 KiB	81 ms
cdnjs.cloudflare.com/ajax/libs/tiny-slider/2.9.2/tiny-slider.css	1.2 KiB	256 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: 218 ms

URL	Time Spent
tcd.ie/	218 ms
www.tcd.ie/	0.0 ms

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: 40 ms 42.9 KiB

URL	Transfer Size	Est Savings
www.tcd.ie/media/tcd/site-assets/style/20220428-tcd-style.css	29.3 KiB	25.8 KiB
#onetrust-banner-sdk{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%} …	19.8 KiB	17.1 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 118.9 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtm.js?id=GTM-KTX8CV	190.0 KiB	65.1 KiB
cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.js	102.8 KiB	53.8 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 2.9 KiB

URL	Transfer Size	Est Savings
www.tcd.ie/media/tcd/site-assets/scripts/global-20220428.js	6.9 KiB	2.9 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.

URL	Transfer Size
www.trumba.com/i/DgALofSC2uXdgIYr-0%2ACwWat.png	2.9 MiB
www.youtube.com/s/player/218d9d92/player_embed_es6.vflset/en_US/base.js	435.8 KiB
/fit-in/1500x9999/filters:no_upscale()/filters:format(web...	407.7 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021...	193.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-KTX8CV	190.3 KiB
/s/_/ytembeds/_/js/k=ytembeds.base.en_US.CYE28xQTWxU.2021...	146.3 KiB
www.trumba.com/i/DgBvYPNi1ryfntQXbnEewTJW.jpg	141.8 KiB
/fit-in/500x9999/filters:format(webp)/filters:quality(100...	112.7 KiB
/fit-in/500x9999/filters:format(webp)/filters:quality(100...	105.8 KiB
cdn.cookielaw.org/scripttemplates/202311.1.0/otBannerSdk.js	103.0 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
Trinity College Dublin, the University of Dublin `div.row > div.site-header__site-logo > a > img`	www.tcd.ie/media/tcd/site-assets/images/tcd-logo.png
Athena Swan `div.col-12 > div.footer__site-associations > a > img`	/fit-in/200x50/filters:format(webp)/filters:quality(100)/...
Coimbra Group Universities `div.col-12 > div.footer__site-associations > a > img`	/fit-in/200x50/filters:format(webp)/filters:quality(100)/...
LERU `div.col-12 > div.footer__site-associations > a > img`	/fit-in/200x50/filters:format(webp)/filters:quality(100)/...

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

●Time to Interactive 2.4 s

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●JavaScript execution time 0.4 s

●Minimizes main-thread work 1.0 s

●Avoid long main-thread tasks 3 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 150 ms

●Server Backend Latencies 200 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 15 layout shifts found

○INP breakdown

○User Timing marks and measures

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
MORE NEWS `div.news-events-list > div.container > div.row > a.news-events-list__more`
READ MORE `div.col-12 > div.card__inner > div.card__text > a.card__link`
MORE EVENTS `div.news-events-list > div.container > div.row > a.news-events-list__more`

These are opportunities to improve the legibility of your content.

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
Cookie Policy `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a`

○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

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<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

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[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

○`<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.

○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.

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

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.

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 destination	Link Text
strategy.tcd.ie/	READ MORE
cookiepedia.co.uk/giving-consent-to-cookies	More information

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 are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`