Cornell.edu Cornell University
Cornell University is a private research university that provides an exceptional education for undergraduates and graduate and professional students. ...
cornell.edu Mobile Performance
55/100
These metrics represent real-world Chrome users experience viewing cornell.edu 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
Largest Contentful Paint2/100 8.5 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index44/100 6.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive47/100 7.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint75/100 3.0 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.004
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Total Blocking Time100/100 120 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Should Fix (16)
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 1,043 KiB
4,800 ms
Efficiently encode images
Potential savings of 826 KiB
3,750 ms
Defer offscreen images
Potential savings of 1,094 KiB
2,850 ms
Remove unused CSS
Potential savings of 39 KiB
1,510 ms
Properly size images
Potential savings of 171 KiB
750 ms
Minify JavaScript
Potential savings of 11 KiB
450 ms
Minify CSS
Potential savings of 12 KiB
450 ms
Eliminate render-blocking resources
Potential savings of 330 ms
330 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
20 resources found
Minimize main-thread work
2.6 s
Avoid chaining critical requests
26 chains found
Avoid large layout shifts
3 elements found
Avoid long main-thread tasks
8 long tasks found
Keep request counts low and transfer sizes small
56 requests • 1,930 KiB
Largest Contentful Paint element
1 element found
Passed Audits (13)
Preconnect to required origins
Avoids enormous network payloads
Total size was 1,930 KiB
Minimize third-party usage
Third-party code blocked the main thread for 130 ms
Use video formats for animated content
Avoid multiple page redirects
Potential savings of 630 ms
Avoids `document.write()`
Initial server response time was short
Root document took 390 ms
Enable text compression
Preload key requests
Remove unused JavaScript
JavaScript execution time
0.7 s
Avoids an excessive DOM size
602 elements
Uses passive listeners to improve scrolling performance
cornell.edu Mobile SEO
77/100
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)
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`
Document doesn't use legible font sizes
Tap targets are not sized appropriately
Passed Audits (10)
robots.txt is valid
Document has a valid `hreflang`
Links have descriptive text
Document has a `<title>` element
Document has a meta description
Page isn’t blocked from indexing
Links are crawlable
Document avoids plugins
Image elements have `[alt]` attributes
Page has successful HTTP status code
cornell.edu Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of cornell.edu 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)
User Experience
Serves images with low resolution
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
Passed Audits (10)
Detected JavaScript libraries
Page has the HTML doctype
Properly defines charset
Allows users to paste into password fields
Avoids requesting the notification permission on page load
Displays images with correct aspect ratio
Avoids deprecated APIs
Avoids Application Cache
Avoids requesting the geolocation permission on page load
No browser errors logged to the console
cornell.edu Mobile Progressive Web App
39/100
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)
Installable
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Does not use HTTPS
1 insecure request found
PWA Optimized
Does not have a `<meta name="viewport">` tag with `width` or `initial-scale`
Does not provide a valid `apple-touch-icon`
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not set a theme color for the address bar.
Fast and reliable
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Passed Audits (4)
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
Contains some content when JavaScript is not available
Page load is fast enough on mobile networks
cornell.edu Mobile Accessibility
98/100
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 (1)
Navigation
These are opportunities to improve keyboard navigation in your application.
Some elements have a `[tabindex]` value greater than 0
Passed Audits (25)
`<video>` elements contain a `<track>` element with `[kind="description"]`
Buttons have an accessible name
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Links have a discernible name
`<html>` element has a valid value for its `[lang]` attribute
Document has a `<title>` element
`[role]`s are contained by their required parent element
`[role]` values are valid
ARIA IDs are unique
`[id]` attributes on active, focusable elements are unique
`<video>` elements contain a `<track>` element with `[kind="captions"]`
`<html>` element has a `[lang]` attribute
`[aria-hidden="true"]` elements do not contain focusable descendents
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Heading elements appear in a sequentially-descending order
Background and foreground colors have a sufficient contrast ratio
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
The page contains a heading, skip link, or landmark region
`[aria-hidden="true"]` is not present on the document `<body>`
`[aria-*]` attributes are valid and not misspelled
Image elements have `[alt]` attributes
`[aria-*]` attributes have valid values
`[role]`s have all required `[aria-*]` attributes
`[aria-*]` attributes match their roles
Mobile Usability
100/100
These checks validate how easily a visitor can use cornell.edu 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).
Passed Audits (5)
Avoid plugins
Configure the viewport
Size content to viewport
Size tap targets appropriately
Use legible font sizes
Mobile Speed
40/100
These checks analyze the performance of cornell.edu 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)
Optimize images
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Avoid landing page redirects
Leverage browser caching
Prioritize visible content
Minify JavaScript
Minify CSS
Minify HTML
Passed Audits (2)
Enable compression
Reduce server response time
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