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
www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpg	0.0 ms	189.0 KiB
www.liverpool.ac.uk/rb/latest/assets/redbrick.js	0.0 ms	114.6 KiB
www.liverpool.ac.uk/rb/latest/assets/redbrick.css	0.0 ms	64.5 KiB
cdn.livechatinc.com/tracking.js	28800.0 s	32.9 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js	604800.0 s	123.2 KiB
www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922	0.0 ms	8.5 KiB
www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2	0.0 ms	8.3 KiB
www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2	0.0 ms	8.2 KiB
/v3.6/customer/action/get_localization?organization_id=8d...	585.0 s	4.7 KiB
/v3.6/customer/action/get_configuration?organization_id=8...	585.0 s	1.7 KiB
/v3.6/customer/action/get_dynamic_configuration?x-region=...	0.0 ms	630 B
/global-mapper/lc_license_id/12897657/region?jsonp=__lc_r...	0.0 ms	199 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
/s/materialsymbolsoutlined/v146/kJF1BvYX7BgnkSrUwT8OhrdQw...	120 ms
www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922	35 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:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:72.089 source:map[type:text value:[unattributed]]]]

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
Students walking past a building with a sign that reads Liverpool Guild of Stud… `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/liv...	392.0 KiB	348.2 KiB
The Times and The Sunday Times Good University Guide 2026 top 20 badge `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?url=www.liverpool.ac.uk/media/livacuk/redbrick/times-to...	348.0 KiB	345.6 KiB
Computer generated image of University of Liverpool buildings on the India camp… `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/liv...	357.4 KiB	318.2 KiB
A badge depicting the results of the 2026 QS World University Rankings. A black… `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?url=www.liverpool.ac.uk/media/livacuk/redbrick/QS,2026,...	233.0 KiB	223.4 KiB
Victoria Gallery and Museum with University Square and students walking `div.rb-top-level-page > article > picture.rb-picture > img.rb-picture__image`	www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpg	188.7 KiB	174.1 KiB
Three people looking at the Lightbulb moments exhibition in the Tate Hall in th… `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/lig...	170.4 KiB	151.8 KiB
The Times Higher Education logo. Next to it, it says 'World University Rankings `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?url=www.liverpool.ac.uk/media/livacuk/about/the-ranking...	128.7 KiB	126.3 KiB
The TEF 2023 Gold logo. `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?url=www.liverpool.ac.uk/media/livacuk/about/Accolades,-...	118.6 KiB	116.3 KiB
Two students on campus, working together at a computer. `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/liv...	100.4 KiB	84.6 KiB
Daughter and Mum talking to a member of staff outside at an open day `div.rb-block-cover > div.rb-backdrop__inner > picture.rb-picture > img.rb-picture__image`	/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbr...	132.3 KiB	54.2 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-9-IMG

nodeLabel: Daughter and Mum talking to a member of staff outside at an open day

path: 1,HTML,1,BODY,9,DIV,0,DIV,0,PICTURE,2,IMG

selector: div.rb-block-cover > div.rb-backdrop__inner > picture.rb-picture > img.rb-picture__image

snippet: <img src="https://wsrv.nl/?output=webp&url=www.liverpool.ac.uk/media/livacuk/redbric…" class="rb-picture__image " width="1920" height="1280" alt="Daughter and Mum talking to a member of staff outside at an open day">

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.

URL	Protocol
www.liverpool.ac.uk/	http/1.1
www.liverpool.ac.uk/rb/latest/assets/redbrick.css	http/1.1
www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpg	http/1.1
www.liverpool.ac.uk/rb/latest/assets/redbrick.js	http/1.1
www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2	http/1.1
www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2	http/1.1
www.liverpool.ac.uk/media/livacuk/redbrick/icons/conversation.svg	http/1.1
www.liverpool.ac.uk/src/homepage/news	http/1.1
www.liverpool.ac.uk/src/homepage/events	http/1.1
www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922	http/1.1
www.liverpool.ac.uk/rb/assets/icon.svg	http/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

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
www.liverpool.ac.uk/rb/latest/assets/redbrick.css	64.5 KiB	149 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: 294 ms

URL	Time Spent
liverpool.ac.uk/	294 ms
www.liverpool.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: 60 ms 55.6 KiB

URL	Transfer Size	Est Savings
www.liverpool.ac.uk/rb/latest/assets/redbrick.css	63.9 KiB	55.6 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: 60 ms 375.2 KiB

URL	Transfer Size	Est Savings
www.liverpool.ac.uk/rb/latest/assets/redbrick.js	114.3 KiB	68.6 KiB
www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0	172.0 KiB	68.3 KiB
www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0	129.2 KiB	63.0 KiB
www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0	145.3 KiB	60.1 KiB
www.googletagmanager.com/gtm.js?id=GTM-WNRD24SK	180.8 KiB	59.8 KiB
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js	122.8 KiB	55.5 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 reason	Failure type
Pages with WebSocket cannot enter back/forward cache.	Pending browser support

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
/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/liv...	392.8 KiB
/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/liv...	358.1 KiB
/?url=www.liverpool.ac.uk/media/livacuk/redbrick/times-to...	348.7 KiB
/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/liv...	279.1 KiB
/s/materialsymbolsoutlined/v146/kJF1BvYX7BgnkSrUwT8OhrdQw...	253.4 KiB
/?url=www.liverpool.ac.uk/media/livacuk/redbrick/QS,2026,...	233.7 KiB
www.liverpool.ac.uk/media/livacuk/redbrick/contact-us-VGM.jpg	189.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-WNRD24SK	181.1 KiB
www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0	172.0 KiB
/?w=1920&we&output=webp&url=www.liverpool.ac.uk/media/lig...	171.1 KiB

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

●Optimize viewport for mobile

●Max Potential First Input Delay 60 ms

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 15 user timings

●JavaScript execution time 0.3 s

●Minimizes main-thread work 0.7 s

●Avoid long main-thread tasks 1 long task found

●Image elements have explicit `width` and `height`

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 140 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 50 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○Avoid non-composited animations

100

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

○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

●`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

●Definition list items are wrapped in `<dl>` elements

●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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●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

○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

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○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

100

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`