Nationalgallery.org.uk The National Gallery, London
The story of European art, masterpiece by masterpiece.
nationalgallery.org.uk Desktop Performance
69/100
These metrics represent real-world Chrome users experience viewing nationalgallery.org.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
First Input Delay
Cumulative Layout Shift
First Contentful Paint
Largest Contentful Paint
Metrics
Speed Index18/100 3.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint34/100 3.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint84/100 1.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive99/100 1.5 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Total Blocking Time100/100 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (12)
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
520 ms
Reduce initial server response time
Root document took 1,030 ms
427 ms
Serve images in next-gen formats
Potential savings of 372 KiB
320 ms
Remove unused CSS
Potential savings of 38 KiB
120 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
39 resources found
Avoids enormous network payloads
Total size was 2,426 KiB
Avoids an excessive DOM size
719 elements
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
7 chains found
Keep request counts low and transfer sizes small
66 requests • 2,426 KiB
Avoid long main-thread tasks
1 long task found
Passed Audits (16)
Minimizes main-thread work
0.6 s
Avoid multiple page redirects
Potential savings of 190 ms
JavaScript execution time
0.1 s
Efficiently encode images
Potential savings of 44 KiB
Eliminate render-blocking resources
Potential savings of 0 ms
Defer offscreen images
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Preload key requests
Use video formats for animated content
Uses passive listeners to improve scrolling performance
Minify JavaScript
Enable text compression
Minify CSS
Preconnect to required origins
Avoids `document.write()`
Properly size images
Potential savings of 26 KiB
nationalgallery.org.uk Desktop SEO
83/100
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 (10)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page isn’t blocked from indexing
Document has a `<title>` element
Document avoids plugins
Image elements have `[alt]` attributes
Document has a valid `rel=canonical`
Document has a meta description
robots.txt is valid
Page has successful HTTP status code
Document has a valid `hreflang`
nationalgallery.org.uk Desktop Best Practices
85/100
These checks highlight opportunities to improve the overall code health of nationalgallery.org.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 (2)
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
2 vulnerabilities detected
Passed Audits (12)
Avoids deprecated APIs
No browser errors logged to the console
Links to cross-origin destinations are safe
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Detected JavaScript libraries
Displays images with correct aspect ratio
Avoids Application Cache
Page has the HTML doctype
Properly defines charset
nationalgallery.org.uk Desktop Progressive Web App
44/100
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)
Installable
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
PWA Optimized
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Passed Audits (4)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
Page load is fast enough on mobile networks
nationalgallery.org.uk Desktop 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)
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[aria-*]` attributes match their roles
ARIA IDs are unique
The page contains a heading, skip link, or landmark region
Links have a discernible name
`<html>` element has a valid value for its `[lang]` attribute
Document has a `<title>` element
`[id]` attributes on active, focusable elements are unique
`[aria-hidden="true"]` is not present on the document `<body>`
`<html>` element has a `[lang]` attribute
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
Image elements have `[alt]` attributes
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[aria-*]` attributes have valid values
Form elements have associated labels
Background and foreground colors have a sufficient contrast ratio
Heading elements appear in a sequentially-descending order
Desktop Speed
57/100
These checks analyze the performance of nationalgallery.org.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 (5)
Optimize images
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Enable compression
Minify HTML
Passed Audits (5)
Avoid landing page redirects
Reduce server response time
Minify CSS
Minify JavaScript
Prioritize visible content
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