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yahoo.co.jp Mobile Performance
21/100
These metrics represent real-world Chrome users experience viewing yahoo.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
First Input Delay
First Contentful Paint
Largest Contentful Paint
Metrics
Total Blocking Time7/100 1,390 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive8/100 15.0 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index14/100 9.1 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint23/100 5.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint34/100 4.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (20)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Defer offscreen images
Potential savings of 799 KiB
4,200 ms
Remove unused JavaScript
Potential savings of 154 KiB
2,550 ms
Serve images in next-gen formats
Potential savings of 296 KiB
1,500 ms
Avoid multiple page redirects
Potential savings of 1,410 ms
1,410 ms
Eliminate render-blocking resources
Potential savings of 1,120 ms
1,119 ms
Remove unused CSS
Potential savings of 191 KiB
750 ms
Efficiently encode images
Potential savings of 105 KiB
420 ms
Reduce initial server response time
Root document took 670 ms
67 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
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,970 ms
Serve static assets with an efficient cache policy
86 resources found
Minimize main-thread work
7.8 s
Reduce JavaScript execution time
4.1 s
Avoid an excessive DOM size
944 elements
Avoid chaining critical requests
14 chains found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
125 requests • 2,041 KiB
Avoid long main-thread tasks
17 long tasks found
Passed Audits (8)
Properly size images
Enable text compression
Avoids enormous network payloads
Total size was 2,041 KiB
Preconnect to required origins
Minify JavaScript
Potential savings of 6 KiB
Use video formats for animated content
Preload key requests
Minify CSS
yahoo.co.jp Mobile SEO
92/100
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 (1)
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
Passed Audits (12)
Links have descriptive text
Links are crawlable
Document has a meta description
Tap targets are sized appropriately
100% appropriately sized tap targets
Document has a valid `hreflang`
Document has a valid `rel=canonical`
Page isn’t blocked from indexing
Page has successful HTTP status code
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Document uses legible font sizes
81.57% legible text
Document has a `<title>` element
yahoo.co.jp Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of yahoo.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 (3)
General
Browser errors were logged to the console
Trust and Safety
Does not use HTTPS
1 insecure request found
Links to cross-origin destinations are unsafe
Passed Audits (11)
Properly defines charset
Allows users to paste into password fields
Avoids Application Cache
Serves images with appropriate resolution
Displays images with correct aspect ratio
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids deprecated APIs
Avoids requesting the notification permission on page load
Avoids requesting the geolocation permission on page load
Page has the HTML doctype
Detected JavaScript libraries
yahoo.co.jp Mobile Progressive Web App
25/100
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
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
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`
Fast and reliable
Page load is not fast enough on mobile networks
Interactive at 15.0 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Passed Audits (5)
Provides a valid `apple-touch-icon`
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
yahoo.co.jp Mobile Accessibility
65/100
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 (9)
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
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.
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.
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.
Buttons do not have an accessible name
Image elements do not have `[alt]` attributes
Form elements do not have associated labels
Links do not have a discernible name
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (14)
`<html>` element has a valid value for its `[lang]` attribute
`<html>` element has a `[lang]` attribute
ARIA IDs are unique
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[aria-*]` attributes match their roles
`[aria-*]` attributes are valid and not misspelled
`[role]`s are contained by their required parent element
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
`[role]` values are valid
Heading elements appear in a sequentially-descending order
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes have valid values
Document has a `<title>` element
Mobile Usability
96/100
These checks validate how easily a visitor can use yahoo.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).
Should Fix (2)
Size content to viewport
Size tap targets appropriately
Passed Audits (3)
Avoid plugins
Configure the viewport
Use legible font sizes
Mobile Speed
49/100
These checks analyze the performance of yahoo.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 (5)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Avoid landing page redirects
Leverage browser caching
Optimize images
Minify HTML
Passed Audits (5)
Enable compression
Reduce server response time
Minify CSS
Minify JavaScript
Prioritize visible content
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