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
/wp-content/themes/nhsengland/static/main-169b0c9c73c3b1f...	86400.0 s	311.7 KiB
/wp-content/themes/nhsengland/static/main-1fcbc37307c8daf...	86400.0 s	167.6 KiB
/wp-content/uploads/2026/02/national-cancer-plan-final-im...	604800.0 s	434.0 KiB
/wp-content/themes/nhsengland/static/lib/jquery.min.js?ve...	86400.0 s	95.2 KiB
/wp-content/themes/nhsengland/static//lib/jquery-ui/theme...	86400.0 s	36.0 KiB
www.england.nhs.uk/wp-content/plugins/page-links-to/dist/new-tab.js?ver=3.3.7	86400.0 s	33.9 KiB
www.england.nhs.uk/wp-includes/js/dist/vendor/wp-polyfill.min.js?ver=3.15.0	86400.0 s	33.0 KiB
/wp-content/uploads/2025/07/10-year-health-plan-image-e17...	604800.0 s	67.6 KiB
/wp-content/themes/nhsengland/static/img/social-media-ico...	86400.0 s	15.4 KiB
/wp-content/plugins/contact-form-7/includes/js/index.js?v...	86400.0 s	13.4 KiB
/wp-content/plugins/contact-form-7/includes/swv/js/index....	86400.0 s	12.5 KiB
/wp-content/themes/nhsengland/static/img/social-media-ico...	86400.0 s	12.3 KiB
/wp-content/themes/nhsengland/static/lib/modernizr.min.js...	86400.0 s	9.9 KiB
www.england.nhs.uk/wp-content/uploads/2023/11/fdp-homepage.jpg	604800.0 s	38.2 KiB
/wp-content/themes/nhsengland/static/img/social-media-ico...	86400.0 s	6.3 KiB
www.england.nhs.uk/wp-includes/js/dist/hooks.min.js?ver=dd5603f07f9220ed27f1	86400.0 s	5.8 KiB
www.england.nhs.uk/wp-includes/js/dist/i18n.min.js?ver=c26c3dc7bed366793375	86400.0 s	5.5 KiB
cc.cdn.civiccomputing.com/8/cookieControl-8.x.min.js?ver=6.9.4	604800.0 s	13.7 KiB
/wp-content/plugins/contact-form-7/includes/css/styles.cs...	86400.0 s	3.2 KiB
www.england.nhs.uk/wp-content/themes/nhsengland/static/img/nhs-england-white.svg	86400.0 s	2.4 KiB
/wp-content/themes/nhsengland/static/print-fe4e4682bcb96c...	86400.0 s	2.4 KiB
/wp-content/plugins/elasticpress/dist/css/general-styles....	86400.0 s	2.3 KiB
/wp-content/themes/nhsengland/static/img/social-media-ico...	86400.0 s	1.9 KiB
www.england.nhs.uk/wp-content/themes/nhsengland/static/img/nhs-uk-logo.svg	86400.0 s	1.9 KiB
/t/1.css?apiType=css&projectid=df8395a8-1825-40a2-9d42-2a...	1.0 s	639 B
/wp-content/plugins/contact-form-7/modules/recaptcha/inde...	86400.0 s	1.2 KiB
/wp-content/plugins/dxw-comment-length-limiter/assets/dxw...	86400.0 s	1.0 KiB
/wp-content/themes/nhsengland/static/img/social-media-ico...	86400.0 s	823 B
/wp-content/themes/nhsengland/static/img/social-media-ico...	86400.0 s	668 B
www.gstatic.com/recaptcha/api2/logo_48.png	604800.0 s	2.3 KiB

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.160706] map[node:map[boundingRect:map[bottom:3610 height:3168 left:0 right:1350 top:442 width:1350] lhId:page-4-MAIN nodeLabel:We lead the NHS in England to deliver high quality services for all If you are… path:5,HTML,2,BODY,4,MAIN selector:body.home > main.main snippet:<main class="main group" role="main"> type:node] score:0.160706 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:1253 height:230 left:105 right:445 top:1023 width:340] lhId:page-0-IMG nodeLabel:An adult and a child sit together on a sofa in a brightly lit room. The child h… path:5,HTML,2,BODY,4,MAIN,1,SECTION,2,DIV,0,DIV,0,ARTICLE,0,FIGURE,0,A,0,IMG selector:article.article-component > figure.article-image > a.external-link > img snippet:<img src="https://www.england.nhs.uk/wp-content/uploads/2026/02/national-cancer-plan…" alt="An adult and a child sit together on a sofa in a brightly lit room. The ch…"> type:node]]] type:subitems]]]

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:0.998 source:map[column:30286 line:2 type:source-location url:https://www.england.nhs.uk/wp-content/themes/nhsengland/static/lib/jquery.min.js?ver=6.9.4 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:39.711 source:map[type:text value:[unattributed]]] map[reflowTime:0.998 source:map[column:31379 line:1 type:source-location url:https://www.england.nhs.uk/wp-content/themes/nhsengland/static/lib/jquery.min.js?ver=6.9.4 urlProvider:network]] map[reflowTime:1.349 source:map[column:380 line:580 type:source-location url:https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js urlProvider:network]] map[reflowTime:1.107 source:map[column:47 line:303 type:source-location url:https://www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.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
An adult and a child sit together on a sofa in a brightly lit room. The child h… `article.article-component > figure.article-image > a.external-link > img`	/wp-content/uploads/2026/02/national-cancer-plan-final-im...	433.7 KiB	422.5 KiB
Fit For The Future: 10 Year Health Plan for England - image of front page. `article.article-component > figure.article-image > a.external-link > img`	/wp-content/uploads/2025/07/10-year-health-plan-image-e17...	67.3 KiB	55.9 KiB
A nurse stands by a hospital bed talking to a patient `article.article-component > figure.article-image > a > img`	www.england.nhs.uk/wp-content/uploads/2023/11/fdp-homepage.jpg	37.9 KiB	26.1 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:1539.1080002441406 label:Time to first byte subpart:timeToFirstByte] map[duration:1585.9459997558595 label:Element render delay subpart:elementRenderDelay]]

lhId: page-3-DIV

nodeLabel: We've put some small files called cookies on your device to make our site work.…

path: 5,HTML,2,BODY,1,DIV,0,DIV,1,DIV

selector: body.home > div.cookie-banner-container > div.cookie-banner > div.rich-text

snippet: <div class="rich-text">

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
/wp-content/themes/nhsengland/static/main-1fcbc37307c8daf...	167.6 KiB	502 ms
/wp-content/themes/nhsengland/static/lib/jquery.min.js?ve...	95.2 KiB	391 ms
cc.cdn.civiccomputing.com/8/cookieControl-8.x.min.js?ver=6.9.4	13.7 KiB	290 ms
/wp-content/themes/nhsengland/static/lib/modernizr.min.js...	9.9 KiB	169 ms
/t/1.css?apiType=css&projectid=df8395a8-1825-40a2-9d42-2a...	639 B	228 ms
/wp-content/themes/nhsengland/static//lib/jquery-ui/theme...	36.0 KiB	280 ms
/wp-content/plugins/elasticpress/dist/css/general-styles....	2.3 KiB	169 ms
/wp-content/plugins/contact-form-7/includes/css/styles.cs...	3.2 KiB	59 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: 267 ms

URL	Time Spent
england.nhs.uk/	267 ms
www.england.nhs.uk/	0.0 ms

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
We lead the NHS in England to deliver high quality services for all If you are… `body.home > main.main`	0.161

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

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: 80 ms 65.8 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/nhsengland/static/main-1fcbc37307c8daf...	167.6 KiB	60.5 KiB
/wp-content/themes/nhsengland/static//lib/jquery-ui/theme...	36.0 KiB	5.3 KiB

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: 240 ms 191.4 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/nhsengland/static/main-1fcbc37307c8daf...	167.3 KiB	155.7 KiB
/wp-content/themes/nhsengland/static//lib/jquery-ui/theme...	35.7 KiB	35.7 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: 690 ms 609.9 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/nhsengland/static/main-169b0c9c73c3b1f...	311.4 KiB	269.6 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	361.8 KiB	155.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-N5N4ZJ	133.4 KiB	69.6 KiB
www.googletagmanager.com/gtag/js?id=G-T33BJYG3P5&cx=c&gtm=4e64h1	153.1 KiB	62.4 KiB
/wp-content/themes/nhsengland/static/lib/jquery.min.js?ve...	94.9 KiB	52.4 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
An adult and a child sit together on a sofa in a brightly lit room. The child h… `article.article-component > figure.article-image > a.external-link > img`	/wp-content/uploads/2026/02/national-cancer-plan-final-im...
Fit For The Future: 10 Year Health Plan for England - image of front page. `article.article-component > figure.article-image > a.external-link > img`	/wp-content/uploads/2025/07/10-year-health-plan-image-e17...
A nurse stands by a hospital bed talking to a patient `article.article-component > figure.article-image > a > img`	www.england.nhs.uk/wp-content/uploads/2023/11/fdp-homepage.jpg
NHS website `div.row > div.footer-logo > a.external-link > img`	www.england.nhs.uk/wp-content/themes/nhsengland/static/img/nhs-uk-logo.svg
NHS England `div.row > div.nhs-e > a > img`	www.england.nhs.uk/wp-content/themes/nhsengland/static/img/nhs-england-white.svg

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

●Max Potential First Input Delay 110 ms

●Optimize DOM size

●Font display

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,468 KiB

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.7 s

●Minimizes main-thread work 1.2 s

●Avoid long main-thread tasks 5 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 20 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 410 ms

○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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
read more about our cookies `div.cookie-banner-container > div.cookie-banner > div.rich-text > a#nhsuk-cookie-banner__link`

These are opportunities to improve the legibility of your content.

Navigation

A value greater than 0 implies an explicit navigation ordering. Although technically valid, this often creates frustrating experiences for users who rely on assistive technologies. Learn more about the `tabindex` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Skip to main content `body.home > div.skip-link > a`
read more about our cookies `div.cookie-banner-container > div.cookie-banner > div.rich-text > a#nhsuk-cookie-banner__link`

These are opportunities to improve keyboard navigation in your application.

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
Terms and conditions `nav.footer-navigation > ul#menu-footer > li#menu-item-29149 > a`
Privacy and cookies `nav.footer-navigation > ul#menu-footer > li#menu-item-29151 > a`

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

●Input buttons have discernible text.

●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.

●`[accesskey]` values are unique

●ARIA attributes are used as specified for the element's role

●`[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

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

●`<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

●Heading elements appear in a sequentially-descending order

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` 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

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○`<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.

○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 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

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`