Rakuten.co.jp
rakuten.co.jp Mobile Performance
16/100
These metrics represent real-world Chrome users experience viewing rakuten.co.jp 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
Cumulative Layout Shift
Largest Contentful Paint
First Input Delay
First Contentful Paint
Metrics
Time to Interactive0/100 28.4 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time1/100 2,210 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Largest Contentful Paint1/100 10.1 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index10/100 9.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint58/100 3.7 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.016
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (22)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 729 KiB
5,280 ms
Defer offscreen images
Potential savings of 950 KiB
4,560 ms
Properly size images
Potential savings of 538 KiB
2,970 ms
Serve images in next-gen formats
Potential savings of 386 KiB
2,100 ms
Use video formats for animated content
Potential savings of 304 KiB
1,500 ms
Eliminate render-blocking resources
Potential savings of 280 ms
283 ms
Remove unused CSS
Potential savings of 18 KiB
270 ms
Reduce initial server response time
Root document took 760 ms
156 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
Reduce the impact of third-party code
Third-party code blocked the main thread for 360 ms
Avoid `document.write()`
Does not use passive listeners to improve scrolling performance
Minimize main-thread work
13.9 s
Serve static assets with an efficient cache policy
46 resources found
Reduce JavaScript execution time
8.7 s
Avoid enormous network payloads
Total size was 4,224 KiB
Avoid an excessive DOM size
1,388 elements
Avoid chaining critical requests
12 chains found
Keep request counts low and transfer sizes small
336 requests • 4,224 KiB
Largest Contentful Paint element
1 element found
Avoid large layout shifts
4 elements found
Avoid long main-thread tasks
20 long tasks found
Passed Audits (7)
Preload key requests
Enable text compression
Potential savings of 3 KiB
Avoid multiple page redirects
Potential savings of 630 ms
Minify JavaScript
Minify CSS
Preconnect to required origins
Efficiently encode images
Potential savings of 9 KiB
rakuten.co.jp Mobile SEO
85/100
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 (3)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Image elements do not have `[alt]` attributes
Mobile Friendly
Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. Learn more.
Tap targets are not sized appropriately
96% appropriately sized tap targets
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (11)
Document avoids plugins
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page has successful HTTP status code
robots.txt is valid
Document has a meta description
Document uses legible font sizes
96.1% legible text
Document has a `<title>` element
Page isn’t blocked from indexing
Links have descriptive text
Document has a valid `hreflang`
Document has a valid `rel=canonical`
rakuten.co.jp Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of rakuten.co.jp 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 (4)
General
Browser errors were logged to the console
User Experience
Serves images with low resolution
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Passed Audits (10)
Avoids Application Cache
Displays images with correct aspect ratio
Page has the HTML doctype
Detected JavaScript libraries
Allows users to paste into password fields
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Avoids deprecated APIs
Properly defines charset
Links to cross-origin destinations are safe
rakuten.co.jp Mobile Progressive Web App
21/100
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 (10)
PWA Optimized
Does not provide fallback content when JavaScript is not available
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
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 28.4 s
Installable
Does not register a service worker that controls page and `start_url`
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Passed Audits (4)
Redirects HTTP traffic to HTTPS
Provides a valid `apple-touch-icon`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Content is sized correctly for the viewport
rakuten.co.jp Mobile Accessibility
43/100
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)
Navigation
These are opportunities to improve keyboard navigation in your application.
The page does not contain a heading, skip link, or landmark region
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.
Image elements do not have `[alt]` attributes
Links do not have a discernible name
Form elements do not have associated labels
Best practices
These items highlight common accessibility best practices.
`[user-scalable="no"]` is used in the `<meta name="viewport">` element or the `[maximum-scale]` attribute is less than 5.
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (5)
Buttons have an accessible name
`<html>` element has a `[lang]` attribute
`[aria-hidden="true"]` is not present on the document `<body>`
Document has a `<title>` element
`<html>` element has a valid value for its `[lang]` attribute
Mobile Usability
100/100
These checks validate how easily a visitor can use rakuten.co.jp 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).
Passed Audits (5)
Avoid plugins
Configure the viewport
Size content to viewport
Size tap targets appropriately
Use legible font sizes
Mobile Speed
53/100
These checks analyze the performance of rakuten.co.jp 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 (7)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Prioritize visible content
Reduce server response time
Minify JavaScript
Optimize images
Enable compression
Passed Audits (3)
Avoid landing page redirects
Minify CSS
Minify HTML
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