Impress.co.jp 株式会社インプレス
impress.co.jp Mobile Performance
50/100
These metrics represent real-world Chrome users experience viewing impress.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
First Contentful Paint
First Input Delay
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Time to Interactive18/100 11.7 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Largest Contentful Paint36/100 4.5 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index48/100 5.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Total Blocking Time50/100 600 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
First Contentful Paint88/100 2.4 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.002
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (18)
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 1,667 KiB
8,550 ms
Defer offscreen images
Potential savings of 556 KiB
2,550 ms
Avoid multiple page redirects
Potential savings of 1,260 ms
1,260 ms
Properly size images
Potential savings of 168 KiB
900 ms
Enable text compression
Potential savings of 154 KiB
750 ms
Remove unused JavaScript
Potential savings of 42 KiB
300 ms
Eliminate render-blocking resources
Potential savings of 250 ms
250 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Reduce the impact of third-party code
Third-party code blocked the main thread for 850 ms
Does not use passive listeners to improve scrolling performance
Serve static assets with an efficient cache policy
33 resources found
Minimize main-thread work
3.6 s
Reduce JavaScript execution time
1.9 s
Avoid enormous network payloads
Total size was 2,853 KiB
Avoid long main-thread tasks
12 long tasks found
Keep request counts low and transfer sizes small
53 requests • 2,853 KiB
Avoid large layout shifts
5 elements found
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
5 chains found
Passed Audits (11)
Use video formats for animated content
Initial server response time was short
Root document took 510 ms
Minify JavaScript
All text remains visible during webfont loads
Remove unused CSS
Minify CSS
Potential savings of 2 KiB
Preload key requests
Efficiently encode images
Preconnect to required origins
Avoids an excessive DOM size
243 elements
Avoids `document.write()`
impress.co.jp Mobile 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 (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
Document does not have a meta description
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
87% appropriately sized tap targets
Passed Audits (10)
Document has a valid `hreflang`
Page isn’t blocked from indexing
Links are crawlable
Links have descriptive text
Document avoids plugins
Document uses legible font sizes
62.67% legible text
Page has successful HTTP status code
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document has a `<title>` element
robots.txt is valid
impress.co.jp Mobile Best Practices
62/100
These checks highlight opportunities to improve the overall code health of impress.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 (5)
Trust and Safety
Links to cross-origin destinations are unsafe
Does not use HTTPS
2 insecure requests found
Includes front-end JavaScript libraries with known security vulnerabilities
3 vulnerabilities detected
User Experience
Displays images with incorrect aspect ratio
Serves images with low resolution
Passed Audits (9)
Avoids deprecated APIs
Allows users to paste into password fields
Properly defines charset
Avoids requesting the notification permission on page load
Detected JavaScript libraries
Page has the HTML doctype
Avoids requesting the geolocation permission on page load
Avoids Application Cache
No browser errors logged to the console
impress.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
Is not configured for a custom splash screen
Does not provide a valid `apple-touch-icon`
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Fast and reliable
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 11.7 s
`start_url` does not respond with a 200 when offline
Installable
Does not use HTTPS
2 insecure requests found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Passed Audits (4)
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Content is sized correctly for the viewport
impress.co.jp Mobile Accessibility
62/100
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 (11)
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>`).
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 input fields do not have accessible names
`[aria-*]` attributes do not match their roles
`[aria-hidden="true"]` elements contain focusable descendents
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
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
`<frame>` or `<iframe>` elements do not have a title
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.
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.
Passed Audits (14)
`[role]`s are contained by their required parent element
ARIA IDs are unique
`[aria-*]` attributes are valid and not misspelled
Buttons have an accessible name
`[role]` values are valid
The page contains a heading, skip link, or landmark region
`[aria-hidden="true"]` is not present on the document `<body>`
No element has a `[tabindex]` value greater than 0
`[aria-*]` attributes have valid values
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`<html>` element has a valid value for its `[lang]` attribute
`[role]`s have all required `[aria-*]` attributes
Mobile Usability
97/100
These checks validate how easily a visitor can use impress.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 (1)
Size tap targets appropriately
Passed Audits (4)
Avoid plugins
Configure the viewport
Size content to viewport
Use legible font sizes
Mobile Speed
52/100
These checks analyze the performance of impress.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)
Leverage browser caching
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Enable compression
Optimize images
Minify CSS
Minify HTML
Passed Audits (3)
Reduce server response time
Minify JavaScript
Prioritize visible content
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