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nicovideo.jp Desktop Performance
45/100
These metrics represent real-world Chrome users experience viewing nicovideo.jp web page. 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 Time21/100 590 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index31/100 2.8 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Largest Contentful Paint34/100 3.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive65/100 3.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint80/100 1.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.034
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (12)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 475 KiB
1,350 ms
Serve images in next-gen formats
Potential savings of 686 KiB
160 ms
Defer offscreen images
Potential savings of 161 KiB
80 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
39 resources found
Avoid an excessive DOM size
1,150 elements
Minimize main-thread work
2.3 s
Reduce JavaScript execution time
1.4 s
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
6 chains found
Avoid long main-thread tasks
7 long tasks found
Avoid large layout shifts
5 elements found
Keep request counts low and transfer sizes small
81 requests • 2,172 KiB
Passed Audits (17)
Enable text compression
Potential savings of 3 KiB
All text remains visible during webfont loads
Minify CSS
Initial server response time was short
Root document took 530 ms
Use video formats for animated content
Avoid multiple page redirects
Potential savings of 190 ms
Preload key requests
Minify JavaScript
Avoids enormous network payloads
Total size was 2,172 KiB
Remove unused CSS
Properly size images
Potential savings of 27 KiB
Minimize third-party usage
Third-party code blocked the main thread for 70 ms
Eliminate render-blocking resources
Potential savings of 0 ms
Avoids `document.write()`
Efficiently encode images
Potential savings of 361 KiB
Uses passive listeners to improve scrolling performance
Preconnect to required origins
nicovideo.jp Desktop 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 (2)
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.
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
Passed Audits (10)
robots.txt is valid
Document has a valid `rel=canonical`
Image elements have `[alt]` attributes
Document avoids plugins
Document has a valid `hreflang`
Page has successful HTTP status code
Document has a `<title>` element
Document has a meta description
Page isn’t blocked from indexing
Links have descriptive text
nicovideo.jp Desktop Best Practices
85/100
These checks highlight opportunities to improve the overall code health of nicovideo.jp 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 (2)
Trust and Safety
Does not use HTTPS
1 insecure request found
General
Browser errors were logged to the console
Passed Audits (12)
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids requesting the notification permission on page load
Properly defines charset
Links to cross-origin destinations are safe
Page has the HTML doctype
Avoids deprecated APIs
Detected JavaScript libraries
Serves images with appropriate resolution
Avoids Application Cache
Displays images with correct aspect ratio
nicovideo.jp Desktop Progressive Web App
11/100
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 (11)
Installable
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Fast and reliable
`start_url` does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 16.8 s
Current page does not respond with a 200 when offline
PWA Optimized
Does not set a theme color for the address bar.
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Passed Audits (2)
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
nicovideo.jp Desktop 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)
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
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>`).
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.
Links do not have a discernible name
Form elements do not have associated labels
Buttons do not have an accessible name
Passed Audits (8)
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Image elements have `[alt]` attributes
`<html>` element has a `[lang]` attribute
The page contains a heading, skip link, or landmark region
Heading elements appear in a sequentially-descending order
`[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
Desktop Speed
67/100
These checks analyze the performance of nicovideo.jp on desktop devices and return PageSpeed score and information on how to improve the load time. What makes a good Progressive Web App?
Should Fix (7)
Optimize images
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Prioritize visible content
Enable compression
Minify HTML
Minify CSS
Passed Audits (3)
Avoid landing page redirects
Reduce server response time
Minify JavaScript
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