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zozo.jp Mobile Performance
12/100
These metrics represent real-world Chrome users experience viewing zozo.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
Largest Contentful Paint
First Contentful Paint
First Input Delay
Cumulative Layout Shift
Metrics
Total Blocking Time0/100 3,910 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 9.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive3/100 18.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index6/100 11.1 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint52/100 3.9 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift57/100 0.222
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (23)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Avoid multiple page redirects
Potential savings of 18,630 ms
18,630 ms
Eliminate render-blocking resources
Potential savings of 2,320 ms
2,316 ms
Serve images in next-gen formats
Potential savings of 431 KiB
1,580 ms
Remove unused JavaScript
Potential savings of 269 KiB
1,490 ms
Efficiently encode images
Potential savings of 194 KiB
980 ms
Properly size images
Potential savings of 141 KiB
600 ms
Remove unused CSS
Potential savings of 83 KiB
530 ms
Defer offscreen images
Potential savings of 145 KiB
230 ms
Minify JavaScript
Potential savings of 6 KiB
150 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 1,370 ms
Does not use passive listeners to improve scrolling performance
Ensure text remains visible during webfont load
Avoid `document.write()`
Minimize main-thread work
13.5 s
Serve static assets with an efficient cache policy
59 resources found
Reduce JavaScript execution time
7.6 s
Avoid an excessive DOM size
1,315 elements
Avoid large layout shifts
5 elements found
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
17 chains found
Avoid long main-thread tasks
20 long tasks found
User Timing marks and measures
1 user timing
Keep request counts low and transfer sizes small
130 requests • 2,052 KiB
Passed Audits (7)
Initial server response time was short
Root document took 570 ms
Enable text compression
Preload key requests
Minify CSS
Potential savings of 4 KiB
Use video formats for animated content
Avoids enormous network payloads
Total size was 2,052 KiB
Preconnect to required origins
zozo.jp Mobile SEO
78/100
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 (4)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
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
97% appropriately sized tap targets
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Document does not have a valid `rel=canonical`
Image elements do not have `[alt]` attributes
Passed Audits (10)
Page has successful HTTP status code
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Document has a `<title>` element
Document uses legible font sizes
86.51% legible text
Document has a meta description
robots.txt is valid
Document has a valid `hreflang`
Page isn’t blocked from indexing
Links have descriptive text
zozo.jp Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of zozo.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
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Links to cross-origin destinations are unsafe
Passed Audits (10)
Serves images with appropriate resolution
Avoids deprecated APIs
Allows users to paste into password fields
Avoids requesting the geolocation permission on page load
Page has the HTML doctype
Detected JavaScript libraries
Avoids Application Cache
Avoids requesting the notification permission on page load
Properly defines charset
Displays images with correct aspect ratio
zozo.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)
Fast and reliable
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 18.8 s
`start_url` does not respond with a 200 when offline
PWA Optimized
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Installable
Web app manifest does not meet the installability requirements
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Passed Audits (5)
Content is sized correctly for the viewport
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Provides a valid `apple-touch-icon`
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
zozo.jp Mobile Accessibility
56/100
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 (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.
Form elements do not have associated labels
Links do not have a discernible name
Image elements do not have `[alt]` attributes
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 (11)
Document has a `<title>` element
`[lang]` attributes have a valid value
`<html>` element has a `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a valid value for its `[lang]` attribute
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[id]` attributes on active, focusable elements are unique
`[aria-hidden="true"]` is not present on the document `<body>`
Buttons have an accessible name
The page contains a heading, skip link, or landmark region
Heading elements appear in a sequentially-descending order
Mobile Usability
99/100
These checks validate how easily a visitor can use zozo.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
55/100
These checks analyze the performance of zozo.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 (8)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Prioritize visible content
Enable compression
Optimize images
Minify HTML
Minify JavaScript
Minify CSS
Passed Audits (2)
Avoid landing page redirects
Reduce server response time
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