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.

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
/__data/assets/git_bridge/0011/976169/main/fonts/fa-solid...	105 ms
/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp...	80 ms
/__data/assets/git_bridge/0011/976169/main/fonts/fa-sharp...	80 ms
/__data/assets/git_bridge/0011/976169/main/fonts/fa-brand...	80 ms
/__data/assets/git_bridge/0011/976169/main/fonts/fa-regul...	75 ms
/af/3b0680/000000000000000077359463/31/l?primer=37f831d36...	10 ms
/af/584488/0000000000000000773599ca/31/l?primer=37f831d36...	10 ms
/af/64a2a3/0000000000000000773599cd/31/l?primer=37f831d36...	10 ms
/af/2cef2b/000000000000000077359445/31/l?primer=37f831d36...	5.0 ms
/af/4e0d0a/000000000000000077359994/31/l?primer=37f831d36...	5.0 ms
/af/e8b7d1/00000000000000007735999d/31/l?primer=37f831d36...	5.0 ms
/af/e6f9a4/000000000000000077359441/31/l?primer=37f831d36...	5.0 ms
/af/fd9187/00000000000000007735945d/31/l?primer=37f831d36...	5.0 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:96.246 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
article#content > header.home-banner > div.hero-image__veil > video#bannerVideo `article#content > header.home-banner > div.hero-image__veil > video#bannerVideo`	/__data/assets/image/0006/862953/City-St-Georges-video-ba...	981.3 KiB	922.7 KiB
The Edit – the University’s annual magazine Read highlights from the past year… `body.web2020 > main > article#content > section.home__promo`	www.citystgeorges.ac.uk/__data/assets/image/0008/720674/student-life-mobile.jpg	807.9 KiB	672.9 KiB
a.card--news--home__anchor > div.card--news--home__thumbnail > picture > img `a.card--news--home__anchor > div.card--news--home__thumbnail > picture > img`	/__data/assets/image/0011/975944/varieties/breakpoint-mob...	252.1 KiB	236.4 KiB
Three people speak on a panel `a.card--news--home__anchor > div.card--news--home__thumbnail > picture > img`	/__data/assets/image/0004/975523/varieties/breakpoint-mob...	182.2 KiB	166.5 KiB
section.home__promo > div.home__promo__img > picture > img `section.home__promo > div.home__promo__img > picture > img`	www.citystgeorges.ac.uk/__data/assets/image/0010/933832/the-edit-tablet.jpg	122.9 KiB	100.0 KiB
City's red-brick college building with a clock tower, surrounded by trees with … `div.campuses__links__card--image > figure.figure > picture > img`	/__data/assets/image/0008/858626/varieties/breakpoint-mob...	33.5 KiB	16.7 KiB
Students sitting and chatting outside on a sunny day, in front of the entrance … `div.campuses__links__card--image > figure.figure > picture > img`	/__data/assets/image/0009/858627/varieties/breakpoint-mob...	31.5 KiB	14.6 KiB
London skyline of iconic buildings `div.research__content > div.wrap--research__media > picture#724273 > img.media__container__img`	/__data/assets/image/0007/724273/varieties/breakpoint-mob...	28.4 KiB	11.5 KiB
Exterior of Bayes Business School building with large glass windows and a stone… `div.campuses__links__card--image > figure.figure > picture > img`	/__data/assets/image/0010/858628/varieties/breakpoint-mob...	26.7 KiB	9.9 KiB
Two female students looking at a City prospectus `div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img`	/__data/assets/image/0005/721589/varieties/breakpoint-mob...	25.5 KiB	8.6 KiB
div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img `div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img`	/__data/assets/image/0004/718420/varieties/breakpoint-mob...	22.5 KiB	5.7 KiB
Two prospective students talking to a student ambasssador `div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img`	/__data/assets/image/0004/721399/varieties/breakpoint-mob...	22.3 KiB	5.4 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-0-VIDEO

nodeLabel: article#content > header.home-banner > div.hero-image__veil > video#bannerVideo

path: 1,HTML,1,BODY,10,MAIN,2,ARTICLE,7,HEADER,0,DIV,0,VIDEO

selector: article#content > header.home-banner > div.hero-image__veil > video#bannerVideo

snippet: <video class="home-banner__video" id="bannerVideo" aria-describedby="video-description" muted="muted" preload="auto" width="100%" height="auto" tabindex="-1" poster="https://www.citystgeorges.ac.uk/__data/assets/image/0006/862953/City-St-Ge…" webkit-playsinline="" playsinline="" data-play-button="https://www.citystgeorges.ac.uk/__data/assets/file/0008/719828/play_button…" data-pause-button="https://www.citystgeorges.ac.uk/__data/assets/file/0009/719829/pause_butto…">

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
/__data/assets/git_bridge/0011/976169/main/css/home.css?v...	54.4 KiB	600 ms
use.typekit.net/acx2egc.css	2.3 KiB	755 ms
/p.css?s=1&k=acx2egc&ht=tk&f=4526.4531.4621.4648.4649.465...	172 B	753 ms

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
/uc.js?cbid=d20f0709-234f-4c30-b3b6-1298df75d244&implemen...	468.0 s	27.0 KiB
/p.css?s=1&k=acx2egc&ht=tk&f=4526.4531.4621.4648.4649.465...	604800.0 s	172 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.

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: 758 ms

URL	Time Spent
city.ac.uk/	758 ms
www.citystgeorges.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: 600 ms 60.9 KiB

URL	Transfer Size	Est Savings
/__data/assets/git_bridge/0011/976169/main/css/home.css?v...	54.3 KiB	49.8 KiB
	13.4 KiB	11.0 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 195.9 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtm.js?id=GTM-5B77FVX	193.2 KiB	83.8 KiB
/__data/assets/git_bridge/0011/976169/main/js/vendor-dire...	36.3 KiB	35.9 KiB
/__data/assets/git_bridge/0011/976169/main/js/vendor-depe...	35.2 KiB	29.0 KiB
/d20f0709-234f-4c30-b3b6-1298df75d244/cc.js?renew=false&r...	111.9 KiB	25.4 KiB
/__data/assets/git_bridge/0011/976169/main/js/main.js?v=2...	26.8 KiB	21.7 KiB

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	717 ms
Other	623 ms
Style & Layout	548 ms
Parse HTML & CSS	223 ms
Script Parsing & Compilation	139 ms
Rendering	42 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
/__data/assets/video_file/0008/860903/City-St-Georges-web...	5.1 MiB
/__data/assets/image/0006/862953/City-St-Georges-video-ba...	981.7 KiB
www.citystgeorges.ac.uk/__data/assets/image/0008/720674/student-life-mobile.jpg	808.4 KiB
/__data/assets/image/0004/754456/Advance-HE-Membership-lo...	274.2 KiB
/__data/assets/image/0011/975944/varieties/breakpoint-mob...	252.3 KiB
www.googletagmanager.com/gtm.js?id=GTM-5B77FVX	193.6 KiB
/__data/assets/image/0004/975523/varieties/breakpoint-mob...	182.4 KiB
www.citystgeorges.ac.uk/__data/assets/image/0010/933832/the-edit-tablet.jpg	123.2 KiB
/d20f0709-234f-4c30-b3b6-1298df75d244/cc.js?renew=false&r...	112.2 KiB
/__data/assets/git_bridge/0011/976169/main/css/home.css?v...	54.4 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
Athena SWAN Bronze Award logo `ul.global-footer__awards > li > a > img.logo`	/__data/assets/image/0004/754456/Advance-HE-Membership-lo...
Stonewall Silver award logo `ul.global-footer__awards > li.global-footer__awards__4span > a > img.logo`	/__data/assets/image/0010/861769/Silver-Award-2024-white.png
Athena Race Equility Charter Bronze Award logo `ul.global-footer__awards > li > a > img.logo`	/__data/assets/image/0003/754455/Advance-HE-Membership-lo...
Placeholder image. `a.card--event--home__anchor > div.card--event--home__thumbnail > picture > img`	/__data/assets/image/0018/721800/varieties/breakpoint-mob...
Placeholder image. `a.card--event--home__anchor > div.card--event--home__thumbnail > picture > img`	/__data/assets/image/0018/721800/varieties/breakpoint-mob...
a.card--news--home__anchor > div.card--news--home__thumbnail > picture > img `a.card--news--home__anchor > div.card--news--home__thumbnail > picture > img`	/__data/assets/image/0011/975944/varieties/breakpoint-mob...
Three people speak on a panel `a.card--news--home__anchor > div.card--news--home__thumbnail > picture > img`	/__data/assets/image/0004/975523/varieties/breakpoint-mob...
div.card--pathway__txt > div.wrap--icon > div.wrap--icon__img > img.wrap--icon__img `div.card--pathway__txt > div.wrap--icon > div.wrap--icon__img > img.wrap--icon__img`	www.citystgeorges.ac.uk/__data/assets/file/0003/711237/red-map.svg
Two prospective students talking to a student ambasssador `div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img`	/__data/assets/image/0004/721399/varieties/breakpoint-mob...
div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img `div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img`	/__data/assets/image/0004/718420/varieties/breakpoint-mob...
Two female students looking at a City prospectus `div.card--pathway__content > div.wrap--card--pathway__img > picture > img.card--pathway__img`	/__data/assets/image/0005/721589/varieties/breakpoint-mob...
City's red-brick college building with a clock tower, surrounded by trees with … `div.campuses__links__card--image > figure.figure > picture > img`	/__data/assets/image/0008/858626/varieties/breakpoint-mob...
Exterior of Bayes Business School building with large glass windows and a stone… `div.campuses__links__card--image > figure.figure > picture > img`	/__data/assets/image/0010/858628/varieties/breakpoint-mob...
Students sitting and chatting outside on a sunny day, in front of the entrance … `div.campuses__links__card--image > figure.figure > picture > img`	/__data/assets/image/0009/858627/varieties/breakpoint-mob...
Disability confident employers logo `ul.global-footer__awards > li > a > img.logo`	/__data/assets/file/0006/868767/disablity-confident-leade...
The University of business practice and the professions. `div.home-banner__content > div.home-banner__strapline > div.home-banner__strapline__text > img`	/__data/assets/file/0005/719285/city-strapline-outline.svg
TEF Silver Award logo `ul.global-footer__awards > li > a > img.logo`	www.citystgeorges.ac.uk/__data/assets/file/0005/757625/TEF-2023-silver-logo.svg
Ofsted, good provider `ul.global-footer__awards > li.global-footer__awards__4span > a > img.logo`	/__data/assets/file/0011/763949/ofsted-good-provider-whit...
div.card--pathway__txt > div.wrap--icon > div.wrap--icon__img > img.wrap--icon__img `div.card--pathway__txt > div.wrap--icon > div.wrap--icon__img > img.wrap--icon__img`	www.citystgeorges.ac.uk/__data/assets/file/0005/711239/3709-citystgeorges.svg
div.card--pathway__txt > div.wrap--icon > div.wrap--icon__img > img.wrap--icon__img `div.card--pathway__txt > div.wrap--icon > div.wrap--icon__img > img.wrap--icon__img`	www.citystgeorges.ac.uk/__data/assets/file/0005/711239/3709-citystgeorges.svg
University of London `div.global-footer__content__row > div#uol_logo_442249 > a > img.logo`	/__data/assets/file/0018/442242/university-of-london-whit...
div.hero-image__veil > div.banner__video__button__wrap > button.banner__video__button > img.button__img--play `div.hero-image__veil > div.banner__video__button__wrap > button.banner__video__button > img.button__img--play`	/__data/assets/file/0008/719828/play_button-video-hero.sv...

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

●JavaScript execution time 0.7 s

●Avoid long main-thread tasks 6 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 100 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 120 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.

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
Accessibility `div.global-footer__content__row > ul.global-footer__useful-links > li > a#useful-links__accessibility`
City St George's Store `div.global-footer__content__row > ul.global-footer__useful-links > li > a#useful-links__city_store`
Support City St George's `div.global-footer__content__row > ul.global-footer__useful-links > li > a#useful-links__support_city`
The Edit `div.global-footer__content__row > ul.global-footer__useful-links > li > a#useful-links__city__the-edit`

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.

●Select elements have associated label elements.

●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

●`[lang]` attributes have a valid value

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

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

●Uses ARIA roles only on compatible elements

●Elements with visible text labels have matching accessible names.

○`[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.

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

○All heading elements contain content.

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

○Identical links have the same purpose.

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○robots.txt is valid