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
cdn-ukwest.onetrust.com/scripttemplates/202512.1.0/otBannerSdk.js	86400.0 s	126.0 KiB
dnc08nwcya6mg.cloudfront.net/original_images/YG_Logo.png?pw=168	0.0 ms	10.9 KiB
widget.trustpilot.com/trustboxes/5419b6ffb0d04a076446a9af/main.js	86400.0 s	26.0 KiB
/logos/704e6ae8-725d-4606-bc55-526c212e95ba/8fce76a5-9764...	86400.0 s	10.6 KiB
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js	86400.0 s	8.1 KiB
/consent/d6184387-4576-4218-9f38-639c735ffe2e/OtAutoBlock...	86400.0 s	4.3 KiB
cdn-ukwest.onetrust.com/logos/static/powered_by_logo.svg	86400.0 s	2.6 KiB
datawrapper.dwcdn.net/lib/embed.min.js	604800.0 s	557 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.

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:66.045 source:map[column:21198 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/polyfills-5CFQRCPP.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:5.866 source:map[column:3972 line:4 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-FTFIAFKH.js urlProvider:network]] map[reflowTime:3.11 source:map[column:206948 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:6.099 source:map[column:5587 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:2.025 source:map[column:58620 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:34.387 source:map[column:40969 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:10.413 source:map[column:39941 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:5.209 source:map[column:56334 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:4.802 source:map[column:7082 line:1 type:source-location url:https://d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js urlProvider:network]] map[reflowTime:8.643 source:map[column:49 line:13 type:source-location url:https://d1z3r0i09bwium.cloudfront.net/v1.0/creep.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
c `div.card-body > yg-card-image > div.image-container > img.image`	/images/LondonCouncil.format-webp.webp?pw=750	81.4 KiB	53.4 KiB
s `div.card-body > yg-card-image > div.image-container > img.image`	ygo-assets-websites-public.yougov.net/images/SeneddFull.format-webp.webp?pw=750	62.2 KiB	34.3 KiB
YouGov logo `footer.site-footer > section.container > header.header > img.logo`	dnc08nwcya6mg.cloudfront.net/original_images/YG_Logo.png?pw=168	10.6 KiB	8.1 KiB

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
/consent/d6184387-4576-4218-9f38-639c735ffe2e/OtAutoBlock...	4.3 KiB	769 ms
cdn-ukwest.onetrust.com/scripttemplates/otSDKStub.js	9.1 KiB	151 ms

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

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.

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: 865 ms

URL	Time Spent
yougov.co.uk/	865 ms
yougov.com/en-gb/	0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 716 ms

URL	Time Spent
yougov.com/en-gb/	816 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 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: 630 ms 136.6 KiB

URL	Transfer Size	Est Savings
cdn-ukwest.onetrust.com/scripttemplates/202512.1.0/otBannerSdk.js	125.9 KiB	66.5 KiB
d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-WWXHZVDN.js	102.2 KiB	48.8 KiB
d18w79e3uiqk2z.cloudfront.net/39b5939e/main-5VDDFA2F.js	61.1 KiB	21.3 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
yougov.com/en-gb/	3.3 s	454 ms	203 ms
d18w79e3uiqk2z.cloudfront.net/39b5939e/polyfills-5CFQRCPP.js	2.7 s	1.5 s	0.3 ms
d1z3r0i09bwium.cloudfront.net/v1.0/creep.js	2.7 s	2.5 s	35 ms
Unattributable	1.6 s	286 ms	0.0 ms
d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-22BXOX6I.js	1.5 s	1.2 s	1.7 ms
d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-CSRV2LAD.js	693 ms	662 ms	0.2 ms
cdn-ukwest.onetrust.com/scripttemplates/202512.1.0/otBannerSdk.js	566 ms	393 ms	70 ms
/consent/d6184387-4576-4218-9f38-639c735ffe2e/OtAutoBlock...	342 ms	294 ms	2.2 ms
js-agent.newrelic.com/nr-spa-1.313.1.min.js	199 ms	162 ms	12 ms
d18w79e3uiqk2z.cloudfront.net/39b5939e/chunk-EEY4XZHX.js	74 ms	0.0 ms	0.4 ms
widget.trustpilot.com/bootstrap/v5/tp.widget.bootstrap.min.js	71 ms	44 ms	24 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	7.6 s
Other	3.9 s
Style & Layout	1.2 s
Parse HTML & CSS	540 ms
Script Parsing & Compilation	370 ms
Rendering	207 ms
Garbage Collection	151 ms

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 34.9 KiB

URL	Transfer Size	Est Savings
	23.4 KiB	19.0 KiB
d18w79e3uiqk2z.cloudfront.net/39b5939e/styles-FIQXGEXU.css	19.5 KiB	15.9 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
en-us `div.geo-banner-body > section.message > span.flag > img`	/39b5939e/assets/images/svg/menu/icon-nav-menu-lang-us.svg

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

●Layout shift culprits

●Optimize DOM size

●Font display

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Avoids enormous network payloads Total size was 1,535 KiB

●User Timing marks and measures 46 user timings

●Avoid long main-thread tasks 20 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 60 ms

●Server Backend Latencies 810 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○LCP request discovery

○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.

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
div.geo-banner > div.geo-banner-body > section.dismiss > button `div.geo-banner > div.geo-banner-body > section.dismiss > 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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Featured `div.tab-slide > button.tab-button > span.tab > span`
Agencies `div.tab-slide > button.tab-button > span.tab > span`
Consumer `div.tab-slide > button.tab-button > span.tab > span`
Economy `div.tab-slide > button.tab-button > span.tab > span`
Entertainment `div.tab-slide > button.tab-button > span.tab > span`
Health `div.tab-slide > button.tab-button > span.tab > span`
Politics `div.tab-slide > button.tab-button > span.tab > span`
Society `div.tab-slide > button.tab-button > span.tab > span`
Sports `div.tab-slide > button.tab-button > span.tab > span`
Technology `div.tab-slide > button.tab-button > span.tab > span`
Travel `div.tab-slide > button.tab-button > span.tab > span`

These are opportunities to improve the legibility of your content.

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
Cookies Settings `div.ot-sdk-row > div#onetrust-button-group-parent > div#onetrust-button-group > button#onetrust-pc-btn-handler`

These items highlight common accessibility best practices.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Featured `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Agencies `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Consumer `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Economy `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Entertainment `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Health `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Politics `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Society `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Sports `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Technology `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Travel `div.tab-slides-container > div.tab-slides > div.tab-slide > button.tab-button`
Learn more `div#onetrust-group-container > div#onetrust-policy > div#onetrust-policy-text > a.ot-cookie-policy-link`

○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

●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

●`[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

●Document has a `<title>` element

●`<frame>` or `<iframe>` elements have a title

●`<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

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

○`[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 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

○`<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

○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.

○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.

Best Practices

General

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
/platform/attributor/v1/attributions/ccc-b0--a-2-13----99...	`Failed to load resource: the server responded with a status of 404 ()`

●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 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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

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
platform.yougov.com/legal/privacy-notice	Learn more
yougov.co.uk/about/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

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`