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 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:0.385 source:map[column:8445 line:20 type:source-location url:https://www.uswitch.com/s3/uswitch-includes-production/includes/astro/_astro/index.astro_astro_type_script_index_0_lang.BwRyypT4.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:56.633 source:map[type:text value:[unattributed]]] map[reflowTime:0.385 source:map[column:4934 line:0 type:source-location url:https://www.uswitch.com/s3/uswitch-assets-eu/broadband-frontend/_astro/Uswitch.astro_astro_type_script_index_0_lang.BdIbKOzH.js urlProvider:network]] map[reflowTime:1.985 source:map[column:68246 line:4 type:source-location url:https://fusion-id.uswitch.com/b9xj3w?apiKey=QUYetZCrcOfSoyjbsudb&version=3&loaderVersion=3.12.2 urlProvider:network]] map[reflowTime:3.736 source:map[column:5912 line:4 type:source-location url:https://fusion-id.uswitch.com/b9xj3w?apiKey=QUYetZCrcOfSoyjbsudb&version=3&loaderVersion=3.12.2 urlProvider:network]] map[reflowTime:0.289 source:map[column:91233 line:4 type:source-location url:https://fusion-id.uswitch.com/b9xj3w?apiKey=QUYetZCrcOfSoyjbsudb&version=3&loaderVersion=3.12.2 urlProvider:network]] map[reflowTime:0.32 source:map[column:112307 line:4 type:source-location url:https://fusion-id.uswitch.com/b9xj3w?apiKey=QUYetZCrcOfSoyjbsudb&version=3&loaderVersion=3.12.2 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
Compare over 100 broadband deals with Uswitch `div.global-container > div.hero-col2 > picture > img#hero-image`	/g836doytpz4a/6jY6HeXIAVsLveRd3jRqoS/9d0fb2049b9b49c1c719...	387.9 KiB	357.4 KiB
author `div._expertAdvice_lnj6b_16 > section._expertReviewSection_1w2sb_1 > div._flexContainer_1w2sb_13 > img._expertReviewImg_1w2sb_7`	/builder-img/api/v1/image/assets/8ab3bbafae9e469c86ca663c...	102.6 KiB	102.5 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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

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

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
/b9xj3w?apiKey=QUYetZCrcOfSoyjbsudb&version=3&loaderVersi...	3608.0 s	63.9 KiB
/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...	0.0 ms	5.7 KiB
www.uswitch.com/shared-scripts/perf.js?version=20	86400.0 s	11.1 KiB
/s3/uswitch-assets-eu/broadband/images/providers/vodafone...	0.0 ms	3.5 KiB
/s3/uswitch-assets-eu/broadband/images/providers/bt.png?a...	0.0 ms	3.4 KiB
/s3/uswitch-assets-eu/broadband/channels/logos/netflix_lo...	0.0 ms	2.7 KiB
/s3/uswitch-assets-eu/broadband/channels/logos/discovery-...	0.0 ms	2.1 KiB
images-static.trustpilot.com/api/stars/4.5/128x24.png	0.0 ms	1.7 KiB
/s3/uswitch-assets-eu/broadband/channels/logos/sky-sports...	0.0 ms	1.6 KiB
/s3/uswitch-assets-eu/broadband/channels/logos/sky-cinema...	0.0 ms	1.6 KiB
/s3/uswitch-assets-eu/broadband/channels/logos/sky-atlant...	0.0 ms	1.4 KiB
/s3/uswitch-assets-eu/broadband/images/providers/sky.png?...	0.0 ms	1.3 KiB
cdn.builder.io/api/v1/pixel?apiKey=8ab3bbafae9e469c86ca663c018f53d4	15.0 s	1.2 KiB

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
/s3/uswitch-assets-eu/broadband-frontend/_astro/BaseTable...	5.1 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/styles.4M...	10.1 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/BaseLayou...	3.5 KiB
/s3/uswitch-includes-production/includes/astro/_astro/hea...	4.7 KiB
/s3/uswitch-includes-production/includes/astro/_astro/coo...	2.4 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/AddressAn...	2.4 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/index@_@a...	1.0 KiB
/s3/uswitch-includes-production/includes/astro/_astro/foo...	1.4 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/BaseModal...	1.4 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/getDevice...	7.1 KiB
/s3/uswitch-includes-production/includes/astro/_astro/coo...	2.2 KiB
/s3/uswitch-includes-production/includes/astro/assets/pre...	1.2 KiB

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

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: 80 ms 202.6 KiB

URL	Transfer Size	Est Savings
/s3/uswitch-includes-production/includes/astro/_astro/ind...	115.2 KiB	88.1 KiB
www.uswitch.com/s3/uswitch-includes-production/js/main-060f15b567.js	79.1 KiB	44.4 KiB
www.uswitch.com/s3/uswitch-assets-eu/broadband-frontend/_astro/index.C0_vgsVJ.js	30.6 KiB	25.8 KiB
www.uswitch.com/s3/uswitch-assets-eu/builder/q-vZ0_Q8YH.js	27.1 KiB	22.4 KiB
/s3/uswitch-assets-eu/broadband-frontend/_astro/client.Cn...	56.4 KiB	21.9 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
author `div._expertAdvice_lnj6b_16 > section._expertReviewSection_1w2sb_1 > div._flexContainer_1w2sb_13 > img._expertReviewImg_1w2sb_7`	/builder-img/api/v1/image/assets/8ab3bbafae9e469c86ca663c...
Virgin Media `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...
Virgin Media `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...
Virgin Media `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...
Sky Sports `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/sky-sports...
Sky Atlantic `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/sky-atlant...
Sky Cinema `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/sky-cinema...
Netflix `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/netflix_lo...
Virgin Media `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...
BT `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/bt.png?a...
Sky `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/sky.png?...
Vodafone `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/vodafone...
Virgin Media `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...
Sky Atlantic `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/sky-atlant...
Netflix `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/netflix_lo...
Sky `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/sky.png?...
Sky Atlantic `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/sky-atlant...
Netflix `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/netflix_lo...
Discovery+ `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/discovery-...
Sky `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/sky.png?...
Sky Atlantic `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/sky-atlant...
Netflix `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/netflix_lo...
Discovery+ `div._channels_1uosp_46 > div > div._channelImage_1uosp_71 > img`	/s3/uswitch-assets-eu/broadband/channels/logos/discovery-...
Virgin Media `div._title_1lxgn_344 > div._container_ybieh_1 > div._imageContainer_ybieh_15 > img`	/s3/uswitch-assets-eu/broadband/images/providers/virgin-m...

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

●Time to Interactive 1.9 s

●Max Potential First Input Delay 70 ms

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Font display

●LCP breakdown

●LCP request discovery

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoids enormous network payloads Total size was 2,271 KiB

●User Timing marks and measures 1 user timing

●JavaScript execution time 0.6 s

●Minimizes main-thread work 1.6 s

●Avoid long main-thread tasks 2 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 30 ms

●Server Backend Latencies 130 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 170 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○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.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Deals checked by `section._expertReviewSection_1w2sb_1 > div._flexContainer_1w2sb_13 > div > h5`
div.builder-03c17c9ce2b24adf89b7ef79bf80243b > div.builder-9e1790ec1ba04d618553a64cc4236970 > div.first::mt-0 > h5 `div.builder-03c17c9ce2b24adf89b7ef79bf80243b > div.builder-9e1790ec1ba04d618553a64cc4236970 > div.first::mt-0 > h5`

These are opportunities to improve keyboard navigation in your application.

Tables and lists

Screen readers require list items (`<li>`) to be contained within a parent `<ul>`, `<ol>` or `<menu>` to be announced properly. Learn more about proper list structure.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Virgin Media `div > broadband-scope.broadband-scope > div.single-deal-card-d82a114d-597f-4a18-bcb1-4f1ebabb4567 > li._wrapper_1lxgn_1`

These are opportunities to improve the experience of reading tabular or list data using 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

●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

●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.

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

●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

●`<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>`).

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

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

●`[lang]` attributes have a valid value

●Document has a main landmark.

●Deprecated ARIA roles were not used

●No form fields have multiple labels

●Uses ARIA roles only on compatible elements

●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.

○`[accesskey]` values are unique

○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 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

○`<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

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Skip links are focusable.

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

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

○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.

○Elements with visible text labels have matching accessible names.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
SharedStorage	www.uswitch.com/~partytown/partytown-sandbox-sw.html?1778416751414 line 1, col 7189
AttributionReporting	www.uswitch.com/~partytown/partytown-sandbox-sw.html?1778416751414 line 1, col 7189
Fledge	/b9xj3w?apiKey=QUYetZCrcOfSoyjbsudb&version=3&loaderVersi... line 4, col 60581

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

Source	Description
www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js line 1, col 554	Error: sym:0 at C (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:315) at https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:1:1614 at Array.forEach (<anonymous>) at O (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:1:1602) at HTMLDocument.B (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:862) at _ (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:746) at HTMLDocument.D (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:1193)

www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js line 1, col 554

Error: sym:0
    at C (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:315)
    at https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:1:1614
    at Array.forEach (<anonymous>)
    at O (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:1:1602)
    at HTMLDocument.B (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:862)
    at _ (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:746)
    at HTMLDocument.D (https://www.uswitch.com/s3/uswitch-assets-eu/builder/q-BZuR-q1Y.js:2:1193)

●Uses HTTPS

●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

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

○Detected JavaScript libraries

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`