Lighthouse Mobile

· 0 checks — Mobile 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
www.ucd.ie/t4media/Mobile_Image_1C.png	0.0 ms	851.6 KiB
www.ucd.ie/t4media/Mobile_Dec%204-12.jpg	0.0 ms	411.8 KiB
www.ucd.ie/t4media/450_YinDawson.png	0.0 ms	252.6 KiB
www.ucd.ie/t4media/grid-overlay-footer.png	0.0 ms	241.0 KiB
www.ucd.ie/t4media/discover-research.png	0.0 ms	216.5 KiB
www.ucd.ie/t4media/discover-studentselfie.png	0.0 ms	214.8 KiB
www.ucd.ie/t4media/hero-1.png	0.0 ms	207.1 KiB
www.ucd.ie/t4media/discover-flags.png	0.0 ms	203.7 KiB
www.ucd.ie/t4media/450_Danny.png	0.0 ms	199.7 KiB
www.ucd.ie/t4media/450_EnterprisePartnerships.jpg	0.0 ms	187.0 KiB
www.ucd.ie/t4media/450_DaffodilDay2026.jpg	0.0 ms	182.1 KiB
www.ucd.ie/t4media/450_NovaMOU.jpg	0.0 ms	142.8 KiB
www.ucd.ie/t4media/UCDMasterscampaignhomepagebanner767x550.jpg	0.0 ms	128.6 KiB
www.juicer.io/embed.js	3600.0 s	151.8 KiB
www.ucd.ie/t4media/450_EoinOCearbhaill.jpg	0.0 ms	116.7 KiB
www.juicer.io/api/media/28185206?s=1c6325523c758bf151323d4795df2a3c20762bde	1209600.0 s	1.1 MiB
www.ucd.ie/t4media/main.min.css?v=0.0.1	0.0 ms	85.8 KiB
www.ucd.ie/t4media/la-brands-400.woff2	0.0 ms	83.6 KiB
www.ucd.ie/t4media/450_SerenaCussen.jpg	0.0 ms	55.4 KiB
cookie-cdn.cookiepro.com/scripttemplates/202408.1.0/otBannerSdk.js	86400.0 s	110.8 KiB
www.ucd.ie/t4media/pattern-white.svg	0.0 ms	43.2 KiB
www.ucd.ie/t4media/swiper-bundle.min.js?v=0.0.1	0.0 ms	38.9 KiB
/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.js	86400.0 s	91.6 KiB
www.ucd.ie/t4media/Lato-Regular.woff2	0.0 ms	29.2 KiB
www.ucd.ie/t4media/fancybox.umd.js?v=0.0.1	0.0 ms	29.1 KiB
www.ucd.ie/t4media/Lato-Bold.woff2	0.0 ms	28.7 KiB
www.ucd.ie/t4media/Lato-Black.woff2	0.0 ms	28.4 KiB
www.juicer.io/api/media/28331582?s=5b5231a6ef97696fbe559af097d0dc5bb6a3efc9	1209600.0 s	279.3 KiB
www.juicer.io/api/media/28322470?s=91bd06df2ae43cf223313e9892228a2478fba3ed	1209600.0 s	275.7 KiB
www.ucd.ie/t4media/KeepWell-logo-white.png	0.0 ms	26.2 KiB
www.ucd.ie/t4media/bootstrap.bundle.min.js?v=0.0.1	0.0 ms	23.3 KiB
www.ucd.ie/t4media/universitas-homepage-logo2018.jpeg	0.0 ms	23.1 KiB
www.ucd.ie/t4media/choices.min.js?v=0.0.1	0.0 ms	22.5 KiB
www.ucd.ie/t4media/grid-repeat.png	0.0 ms	20.8 KiB
/api/posts/507263320/images.jpg?external_id=university-co...	1209600.0 s	197.6 KiB
www.ucd.ie/t4media/ucd-homepage-footer-academicimpact.png	0.0 ms	17.7 KiB
www.ucd.ie/t4media/EUA-members-logo.png	0.0 ms	15.7 KiB
www.ucd.ie/t4media/ASI-english-silver-colour.png	0.0 ms	14.2 KiB
www.juicer.io/embed.css	3600.0 s	16.1 KiB
www.ucd.ie/t4media/app.min.js?v=0.0.1	0.0 ms	12.8 KiB
www.juicer.io/api/media/28185316?s=791c6cee59c523a41221c260ec2acf7d8be93f81	1209600.0 s	105.4 KiB
www.ucd.ie/t4media/ucd-homepage-footer-graphic-iau.png	0.0 ms	9.8 KiB
assets.juicer.io/standalone-sprites/gallery-left.png	3600.0 s	9.9 KiB
assets.juicer.io/standalone-sprites/gallery-right.png	3600.0 s	9.9 KiB
www.ucd.ie/t4media/logo-footer.svg	0.0 ms	7.8 KiB
assets.juicer.io/standalone-sprites/gallery.png	3600.0 s	9.7 KiB
www.ucd.ie/t4media/crest-ucd.svg	0.0 ms	7.7 KiB
assets.juicer.io/fonts/fontawesome-5-juicer.woff2?83361522	3600.0 s	9.5 KiB
www.ucd.ie/t4media/ucd-homepage-footer-graphic-una-europa.png	0.0 ms	7.1 KiB
www.juicer.io/api/media/28118118?s=5c6553666eb29900ca14dcf45924eddaaec9dadd	1209600.0 s	60.4 KiB
www.ucd.ie/t4media/ucd-homepage-footer-graphic-unica.png	0.0 ms	4.1 KiB
/api/media/28099288/video_thumbnail?s=0ff1437d6ac7fb5189d...	1209600.0 s	38.8 KiB
cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js	86400.0 s	9.3 KiB
www.juicer.io/api/media/28369596?s=002d5c46ff575821e6e00e2b0f0936833ec959d9	1209600.0 s	25.5 KiB
www.ucd.ie/t4media/icomoon.ttf	0.0 ms	2.1 KiB
/dms/image/v2/C560BAQHmljJ9tD3olA/company-logo_100_100/co...	86400.0 s	5.2 KiB
/logos/bc7db4c4-bfc6-4ac4-8347-c9b125b78420/671a2de4-a7c7...	86400.0 s	4.0 KiB
www.juicer.io/embed/ucd-university-relations/embed-code.js?pages=1&per=8	600.0 s	1.5 KiB
cookie-cdn.cookiepro.com/logos/static/poweredBy_cp_logo.svg	86400.0 s	2.9 KiB
www.ucd.ie/t4media/icon-union.svg	0.0 ms	1.1 KiB
www.ucd.ie/t4media/icon-search.svg	0.0 ms	1.1 KiB
www.ucd.ie/t4media/Polygon-green-bright-bottom-left.svg	0.0 ms	973 B
www.ucd.ie/t4media/Polygon-yellow-top-left.svg	0.0 ms	967 B
www.ucd.ie/t4media/icon-plus.svg	0.0 ms	956 B
www.ucd.ie/t4media/Polygon-green-bottom-right.svg	0.0 ms	949 B
www.ucd.ie/t4media/icon-tiles.svg	0.0 ms	948 B
www.ucd.ie/t4media/Polygon-yellow-top-right.svg	0.0 ms	948 B
/api/posts/507379931/poster_images.jpg?external_id=DXZlcV...	1209600.0 s	8.8 KiB
/api/posts/507311019/poster_images.jpg?external_id=DXPKYy...	1209600.0 s	8.7 KiB
/api/posts/507373283/poster_images.jpg?external_id=DXZFy6...	1209600.0 s	8.4 KiB
/api/posts/507311089/poster_images.jpg?external_id=univer...	1209600.0 s	5.0 KiB
/api/posts/507281215/poster_images.jpg?external_id=univer...	1209600.0 s	4.9 KiB
/api/posts/507263321/poster_images.jpg?external_id=univer...	1209600.0 s	4.9 KiB
/api/posts/507263320/poster_images.jpg?external_id=univer...	1209600.0 s	4.6 KiB

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.ucd.ie/t4media/icomoon.ttf	50 ms
www.ucd.ie/t4media/la-brands-400.woff2	45 ms
assets.juicer.io/fonts/fontawesome-5-juicer.woff2?83361522	20 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:50.888 source:map[column:25717 line:3 type:source-location url:https://www.juicer.io/embed.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:80.882 source:map[type:text value:[unattributed]]] map[reflowTime:6.93 source:map[column:1141 line:2 type:source-location url:https://www.juicer.io/embed.js urlProvider:network]] map[reflowTime:20.894 source:map[column:8634 line:0 type:source-location url:https://www.juicer.io/embed.js urlProvider:network]] map[reflowTime:23.386 source:map[column:31632 line:17 type:source-location url:https://www.juicer.io/embed.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
UCD ranked in world\'s top 50 for Sustainability `div.swiper-slide > div.component-15__background > picture > img`	www.ucd.ie/t4media/Mobile_Image_1C.png	849.8 KiB	813.5 KiB
Making their mark `div.swiper-slide > div.component-15__background > picture > img`	www.ucd.ie/t4media/Mobile_Dec%204-12.jpg	410.6 KiB	374.3 KiB
Photo from universitycollegedublin on Instagram at 4/21/26 at 4:04PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28331582?s=5b5231a6ef97696fbe559af097d0dc5bb6a3efc9	278.9 KiB	249.5 KiB
Photo from universitycollegedublin on Instagram at 4/21/26 at 11:28AM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28322470?s=91bd06df2ae43cf223313e9892228a2478fba3ed	275.0 KiB	245.6 KiB
UCD scientists discover new ‘courier system’ that cells use to transfer importa… `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_YinDawson.png	251.6 KiB	243.7 KiB
Overlay graphic `body.body > footer.footer > div.footer__grid-overlay > img`	www.ucd.ie/t4media/grid-overlay-footer.png	239.9 KiB	207.3 KiB
interior of science centre building `a > div.component-13__item > div.component-13__item--img > img`	www.ucd.ie/t4media/discover-research.png	215.5 KiB	200.7 KiB
smiling students taking a selfie `a > div.component-13__item > div.component-13__item--img > img`	www.ucd.ie/t4media/discover-studentselfie.png	213.9 KiB	199.2 KiB
‘It’s a beautiful honour’ - Danny O\'Donoghue receives James Joyce Award `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_Danny.png	198.8 KiB	190.9 KiB
flags of many different countries against a blue sky `a > div.component-13__item > div.component-13__item--img > img`	www.ucd.ie/t4media/discover-flags.png	202.7 KiB	188.0 KiB
Six UCD projects funded under Research Ireland’s Enterprise Partnership Scheme `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_EnterprisePartnerships.jpg	186.1 KiB	178.2 KiB
overlay image `div#swiper-wrapper-38e7ef22f89285c2 > div.swiper-slide > div.component-15__grid-overlay > img`	www.ucd.ie/t4media/hero-1.png	206.1 KiB	176.1 KiB
Over €70,000 raised by UCD Rugby Football Club for Irish Cancer Society `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_DaffodilDay2026.jpg	181.2 KiB	173.3 KiB
NovaUCD signs MoU with Sandyford Business District and Dún Laoghaire-Rathdown C… `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_NovaMOU.jpg	141.9 KiB	134.0 KiB
Dr Eoin O’Cearbhaill wins 2026 NovaUCD Innovation Award `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_EoinOCearbhaill.jpg	115.8 KiB	107.9 KiB
UCD Masters 2026 `div.swiper-slide > div.component-15__background > picture > img`	www.ucd.ie/t4media/UCDMasterscampaignhomepagebanner767x550.jpg	127.8 KiB	91.4 KiB
Photo from University College Dublin on LinkedIn at 4/17/26 at 4:58PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28185316?s=791c6cee59c523a41221c260ec2acf7d8be93f81	104.9 KiB	87.3 KiB
Over €1m funding for UCD project to enhance materials research capacity in Irel… `a > div.component-25__item > div.component-25__item--img > img`	www.ucd.ie/t4media/450_SerenaCussen.jpg	54.6 KiB	46.7 KiB
The KeepWell Mark `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/KeepWell-logo-white.png	25.5 KiB	24.5 KiB
universitas logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/universitas-homepage-logo2018.jpeg	22.3 KiB	21.0 KiB
Photo from University College Dublin on LinkedIn at 4/22/26 at 2:35PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28369596?s=002d5c46ff575821e6e00e2b0f0936833ec959d9	24.8 KiB	19.2 KiB
united nations academic impact `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-academicimpact.png	16.9 KiB	16.5 KiB
eua members logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/EUA-members-logo.png	15.0 KiB	13.0 KiB
Athena Swan logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ASI-english-silver-colour.png	13.5 KiB	12.2 KiB
Next `li.feed-item > a.j-image > span.j-gallery-nav > span.j-gallery-arrow`	assets.juicer.io/standalone-sprites/gallery-right.png	9.6 KiB	9.5 KiB
Previous `li.feed-item > a.j-image > span.j-gallery-nav > span.j-gallery-arrow`	assets.juicer.io/standalone-sprites/gallery-left.png	9.6 KiB	9.5 KiB
ul#j-column-0 > li.feed-item > a.j-image > ::after `ul#j-column-0 > li.feed-item > a.j-image > ::after`	assets.juicer.io/standalone-sprites/gallery.png	9.1 KiB	9.0 KiB
Profile image for universitycollegedublin `li.feed-item > div.j-poster > a > img`	/api/posts/507379931/poster_images.jpg?external_id=DXZlcV...	8.3 KiB	8.1 KiB
Profile image for universitycollegedublin `li.feed-item > div.j-poster > a > img`	/api/posts/507373283/poster_images.jpg?external_id=DXZFy6...	8.3 KiB	8.1 KiB
IAU logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-graphic-iau.png	9.1 KiB	8.1 KiB
UNA EUROPA Logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-graphic-una-europa.png	6.4 KiB	5.5 KiB
Profile image for University College Dublin `li.feed-item > div.j-poster > a > img`	/dms/image/v2/C560BAQHmljJ9tD3olA/company-logo_100_100/co...	4.5 KiB	4.4 KiB
Profile image for University College Dublin `li.feed-item > div.j-poster > a > img`	/api/posts/507311089/poster_images.jpg?external_id=univer...	4.5 KiB	4.4 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-33-IMG

nodeLabel: UCD Masters 2026

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

selector: div.swiper-slide > div.component-15__background > picture > img

snippet: <img src="/t4media/UCDMasterscampaignhomepagebanner767x550.jpg" alt="UCD Masters 2026">

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

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
/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.js	91.6 KiB	1.7 s
cookie-cdn.cookiepro.com/scripttemplates/otSDKStub.js	9.3 KiB	302 ms
www.ucd.ie/t4media/main.min.css?v=0.0.1	85.8 KiB	903 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: 766 ms

URL	Time Spent
ucd.ie/	766 ms
www.ucd.ie/	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: 300 ms 111.1 KiB

URL	Transfer Size	Est Savings
www.ucd.ie/t4media/main.min.css?v=0.0.1	85.1 KiB	79.3 KiB
	20.0 KiB	17.2 KiB
www.juicer.io/embed.css	15.7 KiB	14.6 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: 1.4 s 287.1 KiB

URL	Transfer Size	Est Savings
www.juicer.io/embed.js	151.5 KiB	102.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-P56RDT5	203.1 KiB	80.3 KiB
cookie-cdn.cookiepro.com/scripttemplates/202408.1.0/otBannerSdk.js	110.3 KiB	59.5 KiB
www.ucd.ie/t4media/fancybox.umd.js?v=0.0.1	28.4 KiB	24.2 KiB
www.ucd.ie/t4media/swiper-bundle.min.js?v=0.0.1	38.2 KiB	21.1 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
www.ucd.ie/	1.5 s	22 ms	3.8 ms
Unattributable	1.4 s	115 ms	0.0 ms
www.juicer.io/embed.js	1.1 s	600 ms	102 ms
www.googletagmanager.com/gtm.js?id=GTM-P56RDT5	640 ms	506 ms	119 ms
cookie-cdn.cookiepro.com/scripttemplates/202408.1.0/otBannerSdk.js	379 ms	240 ms	69 ms
www.ucd.ie/t4media/app.min.js?v=0.0.1	235 ms	189 ms	8.0 ms
/consent/f638e53d-11c1-473f-aa7f-b47b6862f492/OtAutoBlock.js	154 ms	53 ms	81 ms
www.ucd.ie/t4media/fancybox.umd.js?v=0.0.1	67 ms	15 ms	17 ms
www.ucd.ie/t4media/swiper-bundle.min.js?v=0.0.1	51 ms	19 ms	22 ms
www.ucd.ie/t4media/choices.min.js?v=0.0.1	50 ms	23 ms	27 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	1.8 s
Other	1.8 s
Style & Layout	1.1 s
Script Parsing & Compilation	466 ms
Rendering	226 ms
Parse HTML & CSS	178 ms
Garbage Collection	36 ms

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.juicer.io/api/media/28185206?s=1c6325523c758bf151323d4795df2a3c20762bde	1.1 MiB
www.ucd.ie/t4media/Mobile_Image_1C.png	851.6 KiB
www.ucd.ie/t4media/Mobile_Dec%204-12.jpg	411.8 KiB
www.juicer.io/api/media/28331582?s=5b5231a6ef97696fbe559af097d0dc5bb6a3efc9	279.3 KiB
www.juicer.io/api/media/28322470?s=91bd06df2ae43cf223313e9892228a2478fba3ed	275.7 KiB
www.ucd.ie/t4media/450_YinDawson.png	252.6 KiB
www.ucd.ie/t4media/grid-overlay-footer.png	241.0 KiB
www.ucd.ie/t4media/discover-research.png	216.5 KiB
www.ucd.ie/t4media/discover-studentselfie.png	214.8 KiB
www.ucd.ie/t4media/hero-1.png	207.1 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
Overlay graphic `body.body > footer.footer > div.footer__grid-overlay > img`	www.ucd.ie/t4media/grid-overlay-footer.png
Photo from universitycollegedublin on Instagram at 4/17/26 at 2:56PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28185206?s=1c6325523c758bf151323d4795df2a3c20762bde
Photo from universitycollegedublin on Instagram at 4/21/26 at 4:04PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28331582?s=5b5231a6ef97696fbe559af097d0dc5bb6a3efc9
Photo from universitycollegedublin on Instagram at 4/21/26 at 11:28AM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28322470?s=91bd06df2ae43cf223313e9892228a2478fba3ed
Photo from University College Dublin on LinkedIn at 4/16/26 at 11:30AM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28118118?s=5c6553666eb29900ca14dcf45924eddaaec9dadd
Photo from University College Dublin on LinkedIn at 4/16/26 at 11:30AM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	/api/posts/507263320/images.jpg?external_id=university-co...
Photo from University College Dublin on LinkedIn at 4/16/26 at 7:48PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	/api/media/28099288/video_thumbnail?s=0ff1437d6ac7fb5189d...
Photo from University College Dublin on LinkedIn at 4/17/26 at 4:58PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28185316?s=791c6cee59c523a41221c260ec2acf7d8be93f81
Photo from University College Dublin on LinkedIn at 4/22/26 at 2:35PM `ul#j-column-0 > li.feed-item > a.j-image > img.j-content-image`	www.juicer.io/api/media/28369596?s=002d5c46ff575821e6e00e2b0f0936833ec959d9
eua members logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/EUA-members-logo.png
universitas logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/universitas-homepage-logo2018.jpeg
Athena Swan logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ASI-english-silver-colour.png
IAU logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-graphic-iau.png
UNICA logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-graphic-unica.png
UNA EUROPA Logo `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-graphic-una-europa.png
The KeepWell Mark `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/KeepWell-logo-white.png
united nations academic impact `div.component-27__list > div.component-27__item > a > img`	www.ucd.ie/t4media/ucd-homepage-footer-academicimpact.png
University College Dublin `div.container-fluid > a.navbar-brand > div.navbar-brand__main > img.navbar-brand__desktop`	www.ucd.ie/t4media/crest-ucd.svg

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoid long main-thread tasks 19 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 60 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

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

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○User Timing marks and measures

○Avoid non-composited animations

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
‘It’s a beautiful honour’ - Danny O'Donoghue receives James Joyce Award `a > div.component-25__item > div.component-25__item--content > h5.component-25__item--title`
A community of world class academics making discoveries with far-reaching impac… `a > div.component-13__item > div.component-13__item--content > h5.component-13__item--title`
University College Dublin `div.container > div.row > div.col-md-3 > h5`

These are opportunities to improve keyboard navigation in your application.

○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.

●`button`, `link`, and `menuitem` elements have accessible names

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Image elements do not have `[alt]` attributes that are redundant text.

●Identical links have the same purpose.

○`[accesskey]` values are unique

○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

○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

○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.

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

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
www.ucd.ie/future/masters/	LEARN MORE
www.ucd.ie/future/masters/	LEARN MORE
www.ucd.ie/cookie-policy/	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

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid