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Lighthouse Desktop

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

Audit breakdown by category with detailed findings.

73

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.

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.

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
Undergraduate students walking outside the Monica Partridge Building form#form1 > div.homepage-hero-banner > div.banner-background > img.desktop-banner-image
/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World...609.1 KiB499.2 KiB
RobertOwenLab div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img
/PressReleaseLongForm-Images/Science/RobertOwenLab.x18bbc...486.7 KiB477.5 KiB
PlasmaSprayTorch-in-action_Engineeringweb div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img
/PressReleaseLongForm-Images/Engineering/PlasmaSprayTorch...430.4 KiB403.2 KiB
Unjust incarceration of U.S. immigrants during World War II div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img
/Home/FeatureEvents/2021/Images/74030-FeatureThumb-720x31...384.5 KiB373.3 KiB
FossillGreatDying div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img
/PressReleaseLongForm-Images/Science/FossillGreatDying.xa...308.1 KiB287.7 KiB
Profit with purpose: how impact investing is reshaping capitalism div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img
www.nottingham.ac.uk/Home/FeatureEvents/2021/Images/Webinar-Cohen-720.png187.0 KiB175.8 KiB
Face on blue background made up of lots of people standing together div.row > div.col-md-6 > div.imageWhiteCTA-card > img.background-image
/Homepage-2021/Images/Tiles/Vision-standard-banner.x933a2...113.1 KiB98.6 KiB
The American Congress div.vertical-card > div.row > div.col-md-4 > img.vertical-card-img
/PressReleaseLongForm-Images/Arts/We-the-People-exhibitio...69.1 KiB53.9 KiB
Centre for SustainableChemistry div.row > div.col-md-6 > div.imageWhiteCTA-card > img.background-image
/Homepage-2021/Images/Tiles/Centre-for-Sustainable-Chemis...60.9 KiB46.4 KiB
Athena Swan Race Charter gold award div.large-display-icons > div.row > div.col-1 > img.partner-icon
/Homepage-2021/Images/Partners/athena-awan-race-charter-g...33.7 KiB30.4 KiB
Microscope div.row > div.col-lg-6 > div.image-container > img
/Homepage-2021/Images/Tiles/Microscope.xc38aa90b.jpg?w=80...50.7 KiB26.0 KiB
Race charter bronze award div.large-display-icons > div.row > div.col-1 > img.partner-icon
www.nottingham.ac.uk/Homepage-2021/Images/Partners/race-charter.xf76e96e7.jpg26.6 KiB22.6 KiB
UoN Logo div.ot-sdk-container > div.ot-sdk-row > div#onetrust-group-container > img.ot-bnr-logo
/logos/b46049d7-a415-4e33-bd3c-1a4c5022b50a/eca345c8-ac38...15.5 KiB14.8 KiB
Group of people in form of world map div.row > div.col-md-6 > div.imageWhiteCTA-card > img.background-image
/Homepage-2021/Images/Tiles/ref-results-banner.x25fdc42f....25.5 KiB11.0 KiB
Russel group logo div.large-display-icons > div.row > div.col-1 > img.partner-icon
www.nottingham.ac.uk/Homepage-2021/Images/Partners/russelgroup.x2b5e6786.png10.2 KiB6.6 KiB
U21 Universitas div.large-display-icons > div.row > div.col-1 > img.partner-icon
/Homepage-2021/Images/Partners/universitias21-logo.xf07b4...6.0 KiB4.3 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: Undergraduate students walking outside the Monica Partridge Building
path: 1,HTML,1,BODY,0,FORM,15,DIV,0,DIV,3,IMG
selector: form#form1 > div.homepage-hero-banner > div.banner-background > img.desktop-banner-image
snippet: <img class="desktop-banner-image d-none d-sm-block" src="/Homepage-2021/Images/Hero/Normal-Never-Changed-the-World/Desktop/students…" alt="Undergraduate students walking outside the Monica Partridge Building">

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.

URLTransfer SizeDuration
/consent/8d94c393-ee7d-4ad5-95e8-bc88408adffd/OtAutoBlock.js559.9 KiB1.1 s
/WebResource.axd?d=PjUm9HYMtFaBv1w8LgD13UIzsrcgJRMlHl1KVA...32.7 KiB320 ms
www.nottingham.ac.uk/SiteElements/Javascript/aadatalayer.js2.7 KiB
www.nottingham.ac.uk/SiteElements/Javascript/gecko-form.js1.1 KiB
www.nottingham.ac.uk/SiteElements/Javascript/gecko-cookie.js903 B
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js9.1 KiB
www.nottingham.ac.uk/Homepage-2021/Stylesheets/footer.css?version=95491582.2 KiB
/SiteElementsHomepage/js/search-web-resource.js?renew=1&v...961 B
/siteelements/stylesheets/2022/global-2022.css?version=95...28.2 KiB
www.nottingham.ac.uk/Homepage-2021/Stylesheets/homepage-2024.css?version=96274994.6 KiB
www.nottingham.ac.uk/Homepage-2021/Stylesheets/header-v2.css?version=96329271.0 KiB
www.nottingham.ac.uk/homepage-2021/stylesheets/style.css?version=95789312.5 KiB
/siteelements/stylesheets/2022/responsive-2022.css?versio...6.5 KiB
fonts.googleapis.com/icon?family=Material+Icons817 B266 ms
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css19.0 KiB389 ms
maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css7.4 KiB319 ms
cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/js/modaal.min.js5.2 KiB270 ms
cdnjs.cloudflare.com/ajax/libs/Modaal/0.4.4/css/modaal.min.css2.5 KiB270 ms
/etc.clientlibs/uon/clientlibs/clientlib-headerv2.min.css6.5 KiB246 ms
cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css25.2 KiB323 ms
/npm/@accessible360/accessible-slick@1.0.1/slick/slick.mi...9.9 KiB
cdn.jsdelivr.net/npm/@accessible360/accessible-slick@1.0.1/slick/slick.min.css543 B
/npm/@accessible360/accessible-slick@1.0.1/slick/accessib...1.2 KiB

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: 292 ms
URLTime Spent
nottingham.ac.uk/292 ms
www.nottingham.ac.uk/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

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: 80 ms 88.4 KiB
URLTransfer SizeEst Savings
/siteelements/stylesheets/2022/global-2022.css?version=95...27.7 KiB27.5 KiB
cdn.jsdelivr.net/npm/bootstrap@5.0.1/dist/css/bootstrap.min.css24.7 KiB23.8 KiB
#onetrust-banner-sdk .onetrust-vendors-list-handler{cursor:pointer;color:#1f96db;font-size:inherit; … } …21.8 KiB19.0 KiB
cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/all.min.css18.4 KiB18.2 KiB

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reasonFailure type
Pages with cache-control:no-store header cannot enter back/forward cache.Actionable

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 7.1 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: 0.0 ms 62.2 KiB
URLTransfer SizeEst Savings
cdn-ukwest.onetrust.com/scripttemplates/202503.1.0/otBannerSdk.js115.8 KiB62.2 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
Russel group logo div.large-display-icons > div.row > div.col-1 > img.partner-icon
www.nottingham.ac.uk/Homepage-2021/Images/Partners/russelgroup.x2b5e6786.png
U21 Universitas div.large-display-icons > div.row > div.col-1 > img.partner-icon
/Homepage-2021/Images/Partners/universitias21-logo.xf07b4...
Athena Swan Race Charter gold award div.large-display-icons > div.row > div.col-1 > img.partner-icon
/Homepage-2021/Images/Partners/athena-awan-race-charter-g...
Race charter bronze award div.large-display-icons > div.row > div.col-1 > img.partner-icon
www.nottingham.ac.uk/Homepage-2021/Images/Partners/race-charter.xf76e96e7.jpg

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

●Max Potential First Input Delay 130 ms
●Layout shift culprits
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Minify JavaScript
●JavaScript execution time 0.4 s
●Minimizes main-thread work 0.8 s
●Avoid long main-thread tasks 2 long tasks found
●Avoid non-composited animations 2 animated elements found
●Network Requests
●Network Round Trip Times 30 ms
●Server Backend Latencies 50 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 30 ms
●Avoid large layout shifts 9 layout shifts found
○INP breakdown
○User Timing marks and measures
92

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.

Names and labels

Form elements without effective labels can create frustrating experiences for screen reader users. Learn more about the `select` element.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Select study level Undergraduate Postgraduate Research opportunities Apprentice… div.row > div.col-md-4 > div.search-select > select#cfinder-filter

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Go to slide 2 div.news-carousel > ul.slick-dots > li > button
Go to slide 3 div.news-carousel > ul.slick-dots > li > button
Go to slide 4 div.news-carousel > ul.slick-dots > li > button

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-*]` 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
●Background and foreground colors have a sufficient contrast ratio
●Document has a `<title>` element
●`<html>` element has a `[lang]` attribute
●`<html>` element has a valid value for its `[lang]` attribute
●Links have a discernible name
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●No element has a `[tabindex]` value greater than 0
●Heading elements appear in a sequentially-descending order
●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
○`<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
○Links are distinguishable without relying on color.
○The document does not use `<meta http-equiv="refresh">`
○`<object>` elements have alternate text
○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.
○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

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URLAspect Ratio (Displayed)Aspect Ratio (Actual)
UoN Logo div.ot-sdk-container > div.ot-sdk-row > div#onetrust-group-container > img.ot-bnr-logo
/logos/b46049d7-a415-4e33-bd3c-1a4c5022b50a/eca345c8-ac38...64 x 64 (1.00)243 x 90 (2.70)
●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
●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
83

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.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
Quick links div#accordionExample > div.accordion-item > h2#Quick_links-heading > a.accordion-button
Students div#accordionExample > div.accordion-item > h2#Students-heading > a.accordion-button
Staff div#accordionExample > div.accordion-item > h2#Staff-heading > a.accordion-button
Alumni div#accordionExample > div.accordion-item > h2#Alumni-heading > a.accordion-button

To appear in search results, crawlers need access to your app.

○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
●robots.txt is valid
●Image elements have `[alt]` attributes
●Document has a valid `hreflang`
○Document has a valid `rel=canonical`

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