Nationalgallery.org.uk The National Gallery, London
The story of European art, masterpiece by masterpiece.
nationalgallery.org.uk Mobile Performance
51/100
These metrics represent real-world Chrome users experience viewing nationalgallery.org.uk on mobile devices. 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
First Contentful Paint
Largest Contentful Paint
First Input Delay
Cumulative Layout Shift
Metrics
Largest Contentful Paint1/100 9.5 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index34/100 6.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint52/100 3.9 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive54/100 6.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time98/100 190 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (13)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 266 KiB
1,920 ms
Serve images in next-gen formats
Potential savings of 91 KiB
600 ms
Reduce initial server response time
Root document took 1,090 ms
487 ms
Remove unused CSS
Potential savings of 39 KiB
450 ms
Eliminate render-blocking resources
Potential savings of 150 ms
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
40 resources found
Minimize main-thread work
3.0 s
Avoids an excessive DOM size
719 elements
Keep request counts low and transfer sizes small
67 requests • 1,219 KiB
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
11 long tasks found
Avoid chaining critical requests
7 chains found
Passed Audits (15)
Minimize third-party usage
Third-party code blocked the main thread for 90 ms
Efficiently encode images
Minify JavaScript
Use video formats for animated content
Avoid multiple page redirects
Potential savings of 630 ms
JavaScript execution time
0.9 s
Preload key requests
Avoids `document.write()`
Uses passive listeners to improve scrolling performance
Minify CSS
Defer offscreen images
Properly size images
Preconnect to required origins
Avoids enormous network payloads
Total size was 1,219 KiB
Enable text compression
nationalgallery.org.uk Mobile SEO
86/100
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.
Should Fix (2)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Links do not have descriptive text
9 links found
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (12)
Document avoids plugins
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page isn’t blocked from indexing
robots.txt is valid
Document has a valid `rel=canonical`
Document has a `<title>` element
Tap targets are sized appropriately
100% appropriately sized tap targets
Document has a meta description
Document uses legible font sizes
100% legible text
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Page has successful HTTP status code
nationalgallery.org.uk Mobile Best Practices
85/100
These checks highlight opportunities to improve the overall code health of nationalgallery.org.uk mobile 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 (2)
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
2 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Passed Audits (12)
Avoids deprecated APIs
Links to cross-origin destinations are safe
Displays images with correct aspect ratio
No browser errors logged to the console
Avoids requesting the geolocation permission on page load
Serves images with appropriate resolution
Detected JavaScript libraries
Avoids requesting the notification permission on page load
Allows users to paste into password fields
Page has the HTML doctype
Avoids Application Cache
Properly defines charset
nationalgallery.org.uk Mobile Progressive Web App
46/100
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
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Does not provide a valid `apple-touch-icon`
Fast and reliable
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Installable
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Does not use HTTPS
1 insecure request found
Passed Audits (5)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page load is fast enough on mobile networks
Contains some content when JavaScript is not available
Content is sized correctly for the viewport
Redirects HTTP traffic to HTTPS
nationalgallery.org.uk Mobile Accessibility
100/100
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.
Passed Audits (19)
`[aria-*]` attributes are valid and not misspelled
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Background and foreground colors have a sufficient contrast ratio
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[aria-*]` attributes match their roles
Heading elements appear in a sequentially-descending order
`[id]` attributes on active, focusable elements are unique
`[aria-hidden="true"]` is not present on the document `<body>`
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
ARIA IDs are unique
`[aria-*]` attributes have valid values
Form elements have associated labels
The page contains a heading, skip link, or landmark region
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
Image elements have `[alt]` attributes
Buttons have an accessible name
Links have a discernible name
`<html>` element has a valid value for its `[lang]` attribute
Mobile Usability
99/100
These checks validate how easily a visitor can use nationalgallery.org.uk on a mobile device. Test results include a list of any mobile usability problems. Mobile usability problems are issues that can affect a user that visits the page on a mobile (small screen) device, including small font sizes (which are hard to read on a small screen).
Should Fix (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
72/100
These checks analyze the performance of nationalgallery.org.uk on mobile devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (4)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Enable compression
Optimize images
Passed Audits (6)
Avoid landing page redirects
Reduce server response time
Minify CSS
Minify HTML
Minify JavaScript
Prioritize visible content
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