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bbc.co.uk Desktop Performance
41/100
These metrics represent real-world Chrome users experience viewing bbc.co.uk web page. Reports are focused on loading performance and other critical factors that most affect user experience. Follow our guide to track, optimize, and improve the quality of your web pages.
User Loading Experience
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Largest Contentful Paint
Metrics
Largest Contentful Paint21/100 3.7 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive26/100 6.1 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index27/100 3.0 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Cumulative Layout Shift37/100 0.319
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
First Contentful Paint38/100 1.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Total Blocking Time81/100 200 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (19)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 671 KiB
1,260 ms
Properly size images
Potential savings of 648 KiB
410 ms
Serve images in next-gen formats
Potential savings of 313 KiB
160 ms
Eliminate render-blocking resources
Potential savings of 150 ms
151 ms
Minify JavaScript
Potential savings of 39 KiB
80 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Does not use passive listeners to improve scrolling performance
Avoid `document.write()`
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
37 resources found
Minimize main-thread work
4.0 s
Avoid enormous network payloads
Total size was 3,578 KiB
Avoid an excessive DOM size
1,123 elements
Reduce JavaScript execution time
1.8 s
Avoid large layout shifts
5 elements found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
221 requests • 3,578 KiB
Avoid long main-thread tasks
11 long tasks found
User Timing marks and measures
6 user timings
Avoid chaining critical requests
31 chains found
Passed Audits (11)
Remove unused CSS
Potential savings of 17 KiB
Initial server response time was short
Root document took 30 ms
Minify CSS
Use video formats for animated content
Preload key requests
Minimize third-party usage
Third-party code blocked the main thread for 240 ms
Efficiently encode images
Potential savings of 12 KiB
Enable text compression
Potential savings of 11 KiB
Defer offscreen images
Potential savings of 57 KiB
Preconnect to required origins
Avoid multiple page redirects
bbc.co.uk Desktop SEO
100/100
These checks ensure that your page is optimized for search engine results ranking. There are additional factors Lighthouse does not check that may affect your search ranking. Learn more. Run these additional validators on your site to check additional SEO best practices.
Passed Audits (12)
Document avoids plugins
Page has successful HTTP status code
Links are crawlable
Document has a valid `hreflang`
Image elements have `[alt]` attributes
Document has a `<title>` element
robots.txt is valid
Page isn’t blocked from indexing
Links have descriptive text
Document has a valid `rel=canonical`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document has a meta description
bbc.co.uk Desktop Best Practices
69/100
These checks highlight opportunities to improve the overall code health of bbc.co.uk page. Current recommendations will help to make your page fast and secure, to create a good user experience and to avoid deprecated technologies.
Should Fix (4)
General
Uses deprecated APIs
1 warning found
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
User Experience
Displays images with incorrect aspect ratio
Passed Audits (10)
Page has the HTML doctype
Avoids Application Cache
Detected JavaScript libraries
Allows users to paste into password fields
Serves images with appropriate resolution
Avoids requesting the geolocation permission on page load
No browser errors logged to the console
Properly defines charset
Links to cross-origin destinations are safe
Avoids requesting the notification permission on page load
bbc.co.uk Desktop Progressive Web App
22/100
These checks validate the aspects of a Progressive Web App. Learn more. These checks are required by the baseline PWA Checklist but are not automatically checked by Lighthouse. They do not affect your score but it's important that you verify them manually.
Should Fix (9)
PWA Optimized
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not set a theme color for the address bar.
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 27.9 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Installable
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Passed Audits (4)
Contains some content when JavaScript is not available
Provides a valid `apple-touch-icon`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
bbc.co.uk Desktop Accessibility
89/100
These checks highlight opportunities to improve the accessibility of your web app. Only a subset of accessibility issues can be automatically detected so manual testing is also encouraged. These items address areas which an automated testing tool cannot cover. Learn more in our guide on conducting an accessibility review.
Should Fix (6)
Names and labels
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.
`<frame>` or `<iframe>` elements do not have a title
Tables and lists
These are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
Lists do not contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are not contained within `<ul>` or `<ol>` parent elements.
ARIA
These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.
`[aria-hidden="true"]` elements contain focusable descendents
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
`<html>` element does not have a `[lang]` attribute
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (20)
Form elements have associated labels
`[role]` values are valid
ARIA IDs are unique
`[lang]` attributes have a valid value
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Links have a discernible name
Heading elements appear in a sequentially-descending order
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
Buttons have an accessible name
No element has a `[tabindex]` value greater than 0
Image elements have `[alt]` attributes
Document has a `<title>` element
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes have valid values
`[role]`s are contained by their required parent element
`[aria-*]` attributes match their roles
`[aria-*]` attributes are valid and not misspelled
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[id]` attributes on active, focusable elements are unique
Desktop Speed
74/100
These checks analyze the performance of bbc.co.uk on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (7)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Avoid landing page redirects
Prioritize visible content
Enable compression
Minify JavaScript
Passed Audits (3)
Reduce server response time
Minify CSS
Minify HTML
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