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.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	64.3 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	123.3 KiB
www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922	0.0 ms	8.3 KiB
www.liverpool.ac.uk/rb/latest/assets/poppins-latin-400-normal.woff2	0.0 ms	8.0 KiB
www.liverpool.ac.uk/rb/latest/assets/poppins-latin-700-normal.woff2	0.0 ms	8.0 KiB
/v3.6/customer/action/get_localization?organization_id=8d...	600.0 s	4.7 KiB
/v3.6/customer/action/get_configuration?organization_id=8...	600.0 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...	115 ms
www.liverpool.ac.uk/rb/latest/assets/rb-icons.woff2?t=1745341789922	40 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:37.744 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
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	337.5 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	222.5 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	118.2 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	108.2 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=720&output=webp&url=www.liverpool.ac.uk/media/livacuk...	66.4 KiB	33.2 KiB
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=720&output=webp&url=www.liverpool.ac.uk/media/livacuk...	84.7 KiB	28.4 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...	97.9 KiB	24.5 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=720&output=webp&url=www.liverpool.ac.uk/media/lightbu...	54.2 KiB	22.2 KiB

HTTP/2 and HTTP/3 offer many benefits over HTTP/1.1, such as multiplexing. Learn more about using modern HTTP.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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/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/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/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

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	64.3 KiB	1.1 s

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: 847 ms

URL	Time Spent
liverpool.ac.uk/	847 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

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: 0.0 ms 58.8 KiB

URL	Transfer Size	Est Savings
www.liverpool.ac.uk/rb/latest/assets/redbrick.css	64.0 KiB	58.8 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: 2.5 s 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	68.1 KiB
www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0	129.2 KiB	62.9 KiB
www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0	145.3 KiB	60.2 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	122.9 KiB	55.5 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.googletagmanager.com/gtm.js?id=GTM-WNRD24SK	551 ms	328 ms	61 ms
www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0	340 ms	308 ms	29 ms
Unattributable	335 ms	8.0 ms	0.0 ms
www.liverpool.ac.uk/	332 ms	6.1 ms	1.6 ms
www.googletagmanager.com/gtag/js?id=G-D5RC5GKKXW&cx=c&gtm=4e64k0	220 ms	148 ms	48 ms
cc.cdn.civiccomputing.com/9/cookieControl-9.x.min.js	193 ms	160 ms	31 ms
www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0	171 ms	128 ms	43 ms
cdn.livechatinc.com/tracking.js	149 ms	101 ms	10 ms
www.liverpool.ac.uk/rb/latest/assets/redbrick.js	114 ms	92 ms	0.7 ms
/v3.6/customer/action/get_configuration?organization_id=8...	68 ms	43 ms	0.6 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	1.3 s
Style & Layout	427 ms
Other	413 ms
Script Parsing & Compilation	228 ms
Parse HTML & CSS	67 ms
Rendering	28 ms
Garbage Collection	25 ms

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
/?url=www.liverpool.ac.uk/media/livacuk/redbrick/times-to...	348.7 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	172.1 KiB
/?output=webp&url=https://news.liverpool.ac.uk/wp-content...	167.9 KiB
www.googletagmanager.com/gtag/js?id=AW-629082147&cx=c&gtm=4e64k0	145.4 KiB
/?url=www.liverpool.ac.uk/media/livacuk/about/the-ranking...	129.4 KiB
www.googletagmanager.com/gtag/js?id=DC-16755037&cx=c&gtm=4e64k0	129.3 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
section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?output=webp&url=https://news.liverpool.ac.uk/wp-content...
section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image `section.rb-card > div.rb-card__inner > picture.rb-picture > img.rb-picture__image`	/?output=webp&url=https%3A%2F%2Ftulip-assets.liverpool.ac...

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

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 15 user timings

●Avoid long main-thread tasks 10 long tasks found

●Network Requests

●Network Round Trip Times 50 ms

●Server Backend Latencies 400 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 60 ms

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

○Avoid large layout shifts

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

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
form.rb-block-container > fieldset.rb-fieldset > div.rb-formgroup > button.rb-button `form.rb-block-container > fieldset.rb-fieldset > div.rb-formgroup > button.rb-button`

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.

○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

●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`