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usenix.org Mobile Performance
15/100
These metrics represent real-world Chrome users experience viewing usenix.org 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 Input Delay
First Contentful Paint
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Total Blocking Time0/100 3,390 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Largest Contentful Paint2/100 8.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive3/100 18.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index18/100 8.5 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint40/100 4.5 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 (19)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 240 KiB
5,250 ms
Eliminate render-blocking resources
Potential savings of 1,800 ms
1,800 ms
Serve images in next-gen formats
Potential savings of 147 KiB
1,380 ms
Avoid multiple page redirects
Potential savings of 1,110 ms
1,110 ms
Remove unused CSS
Potential savings of 46 KiB
450 ms
Properly size images
Potential savings of 39 KiB
300 ms
Minify JavaScript
Potential savings of 26 KiB
300 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 3,680 ms
Ensure text remains visible during webfont load
Does not use passive listeners to improve scrolling performance
Minimize main-thread work
10.3 s
Reduce JavaScript execution time
7.3 s
Serve static assets with an efficient cache policy
4 resources found
Avoids enormous network payloads
Total size was 2,492 KiB
Avoid large layout shifts
5 elements found
Avoid long main-thread tasks
20 long tasks found
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
18 chains found
Keep request counts low and transfer sizes small
107 requests • 2,492 KiB
Passed Audits (10)
Preconnect to required origins
Defer offscreen images
Potential savings of 336 KiB
Minify CSS
Avoids an excessive DOM size
654 elements
Avoids `document.write()`
Initial server response time was short
Root document took 150 ms
Efficiently encode images
Use video formats for animated content
Enable text compression
Preload key requests
usenix.org Mobile SEO
85/100
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)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
robots.txt is not valid
68 errors found
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
93% appropriately sized tap targets
Passed Audits (11)
Document has a meta description
Page has successful HTTP status code
Image elements have `[alt]` attributes
Document has a valid `hreflang`
Links have descriptive text
Document uses legible font sizes
98.65% legible text
Document has a valid `rel=canonical`
Page isn’t blocked from indexing
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Document has a `<title>` element
usenix.org Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of usenix.org 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)
Trust and Safety
Links to cross-origin destinations are unsafe
Includes front-end JavaScript libraries with known security vulnerabilities
6 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Browser Compatibility
Page lacks the HTML doctype, thus triggering quirks-mode
Passed Audits (10)
Detected JavaScript libraries
Displays images with correct aspect ratio
No browser errors logged to the console
Avoids requesting the geolocation permission on page load
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Avoids deprecated APIs
Properly defines charset
Allows users to paste into password fields
Avoids Application Cache
usenix.org Mobile Progressive Web App
18/100
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 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
PWA Optimized
Does not set a theme color for the address bar.
Does not provide a valid `apple-touch-icon`
Content is not sized correctly for the viewport
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Fast and reliable
`start_url` does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 18.6 s
Current page does not respond with a 200 when offline
Passed Audits (3)
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
usenix.org Mobile Accessibility
84/100
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 (4)
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
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.
Internationalization and localization
These are opportunities to improve the interpretation of your content by users in different locales.
`<html>` element does not have a `[lang]` attribute
Passed Audits (21)
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Image elements have `[alt]` attributes
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes have valid values
Background and foreground colors have a sufficient contrast ratio
`<html>` element has a valid value for its `[lang]` attribute
Heading elements appear in a sequentially-descending order
`<frame>` or `<iframe>` elements have a title
`[role]`s are contained by their required parent element
`[aria-*]` attributes match their roles
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]` values are valid
`[id]` attributes on active, focusable elements are unique
`[aria-hidden="true"]` is not present on the document `<body>`
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
`[role]`s have all required `[aria-*]` attributes
`[aria-hidden="true"]` elements do not contain focusable descendents
ARIA IDs are unique
Document has a `<title>` element
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Mobile Usability
65/100
These checks validate how easily a visitor can use usenix.org 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 (4)
Use legible font sizes
Configure the viewport
Size tap targets appropriately
Size content to viewport
Passed Audits (1)
Avoid plugins
Mobile Speed
52/100
These checks analyze the performance of usenix.org 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)
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Leverage browser caching
Minify JavaScript
Passed Audits (5)
Enable compression
Reduce server response time
Minify CSS
Minify HTML
Prioritize visible content
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