Nikkeibp.co.jp 日経BP
日経BPは日本経済新聞グループの一員として、経営・技術・生活という3分野で主にビジネスパーソンに向けて事業を展開しています。その内容は、雑誌・書籍の出版事業、デジタル事業、展示会・セミナーなどのイベント事業、調査・コンサルティング事業など、多種多彩なメディアとサービスを駆使して、高付加価値の先端・専...
nikkeibp.co.jp Mobile Performance
40/100
These metrics represent real-world Chrome users experience viewing nikkeibp.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 Interactive29/100 9.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time31/100 800 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index34/100 6.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint41/100 4.3 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint49/100 4.0 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 (17)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Serve images in next-gen formats
Potential savings of 698 KiB
3,450 ms
Enable text compression
Potential savings of 142 KiB
2,850 ms
Eliminate render-blocking resources
Potential savings of 2,330 ms
2,331 ms
Efficiently encode images
Potential savings of 435 KiB
1,950 ms
Remove unused JavaScript
Potential savings of 243 KiB
1,950 ms
Remove unused CSS
Potential savings of 23 KiB
600 ms
Minify CSS
Potential savings of 7 KiB
300 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Serve static assets with an efficient cache policy
57 resources found
Ensure text remains visible during webfont load
Avoid `document.write()`
Reduce the impact of third-party code
Third-party code blocked the main thread for 780 ms
Minimize main-thread work
5.6 s
Reduce JavaScript execution time
2.8 s
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
109 requests • 14,436 KiB
Avoid long main-thread tasks
17 long tasks found
Avoid chaining critical requests
13 chains found
Passed Audits (11)
Use video formats for animated content
Avoids enormous network payloads
Total size was 2,018 KiB
Preload key requests
Preconnect to required origins
Avoids an excessive DOM size
320 elements
Minify JavaScript
Potential savings of 3 KiB
Avoid multiple page redirects
Potential savings of 630 ms
Initial server response time was short
Root document took 520 ms
Properly size images
Uses passive listeners to improve scrolling performance
Defer offscreen images
nikkeibp.co.jp Mobile SEO
99/100
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)
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
98% appropriately sized tap targets
Passed Audits (12)
Document uses legible font sizes
88.41% legible text
Page has successful HTTP status code
Links are crawlable
Document has a valid `hreflang`
Document avoids plugins
Links have descriptive text
Document has a `<title>` element
Page isn’t blocked from indexing
robots.txt is valid
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Image elements have `[alt]` attributes
Document has a meta description
nikkeibp.co.jp Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of nikkeibp.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
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Links to cross-origin destinations are unsafe
Passed Audits (10)
Displays images with correct aspect ratio
Avoids deprecated APIs
Allows users to paste into password fields
Page has the HTML doctype
Avoids requesting the notification permission on page load
Properly defines charset
Avoids requesting the geolocation permission on page load
Avoids Application Cache
Detected JavaScript libraries
Serves images with appropriate resolution
nikkeibp.co.jp 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)
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
PWA Optimized
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
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)
Redirects HTTP traffic to HTTPS
Page load is fast enough on mobile networks
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Content is sized correctly for the viewport
Contains some content when JavaScript is not available
nikkeibp.co.jp Mobile Accessibility
83/100
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 (2)
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 (12)
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Heading elements appear in a sequentially-descending order
`<video>` elements contain a `<track>` element with `[kind="captions"]`
`<html>` element has a `[lang]` attribute
The page contains a heading, skip link, or landmark region
Document has a `<title>` element
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Links have a discernible name
`<video>` elements contain a `<track>` element with `[kind="description"]`
Image elements have `[alt]` attributes
`<html>` element has a valid value for its `[lang]` attribute
`[aria-hidden="true"]` is not present on the document `<body>`
Mobile Usability
89/100
These checks validate how easily a visitor can use nikkeibp.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)
Configure the viewport
Size tap targets appropriately
Passed Audits (4)
Avoid app install interstitials that hide content
Avoid plugins
Size content to viewport
Use legible font sizes
Mobile Speed
36/100
These checks analyze the performance of nikkeibp.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
Enable compression
Avoid landing page redirects
Prioritize visible content
Optimize images
Minify CSS
Passed Audits (3)
Reduce server response time
Minify HTML
Minify JavaScript
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