Purdue.edu Purdue University - Indiana's Land Grant University
Purdue University is a world-renowned, public research university that advances discoveries in science, technology, engineering and math. With its fla...
purdue.edu Mobile Performance
14/100
These metrics represent real-world Chrome users experience viewing purdue.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
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Largest Contentful Paint
Metrics
Total Blocking Time0/100 3,140 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Largest Contentful Paint0/100 18.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive2/100 21.4 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index13/100 9.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint48/100 4.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift89/100 0.105
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (20)
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 589 KiB
3,300 ms
Remove unused JavaScript
Potential savings of 547 KiB
2,400 ms
Enable text compression
Potential savings of 149 KiB
1,610 ms
Properly size images
Potential savings of 277 KiB
1,500 ms
Preload key requests
Potential savings of 930 ms
930 ms
Remove unused CSS
Potential savings of 99 KiB
750 ms
Efficiently encode images
Potential savings of 102 KiB
600 ms
Eliminate render-blocking resources
Potential savings of 450 ms
450 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 4,700 ms
Ensure text remains visible during webfont load
Avoid `document.write()`
Minimize main-thread work
11.8 s
Reduce JavaScript execution time
7.6 s
Serve static assets with an efficient cache policy
20 resources found
Avoid enormous network payloads
Total size was 3,474 KiB
Avoid chaining critical requests
24 chains found
Avoid large layout shifts
1 element found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
123 requests • 3,474 KiB
Avoid long main-thread tasks
20 long tasks found
Passed Audits (9)
Avoid multiple page redirects
Potential savings of 630 ms
Minify CSS
Potential savings of 3 KiB
Use video formats for animated content
Defer offscreen images
Potential savings of 119 KiB
Uses passive listeners to improve scrolling performance
Initial server response time was short
Root document took 290 ms
Preconnect to required origins
Minify JavaScript
Potential savings of 3 KiB
Avoids an excessive DOM size
701 elements
purdue.edu 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 (2)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Links do not have descriptive text
2 links found
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (11)
Document has a `<title>` element
Document uses legible font sizes
100% legible text
Tap targets are sized appropriately
100% appropriately sized tap targets
Document has a valid `hreflang`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document avoids plugins
Page isn’t blocked from indexing
Image elements have `[alt]` attributes
Document has a meta description
robots.txt is valid
Page has successful HTTP status code
purdue.edu Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of purdue.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)
General
Browser errors were logged to the console
Trust and Safety
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Passed Audits (10)
Page has the HTML doctype
Avoids deprecated APIs
Displays images with correct aspect ratio
Detected JavaScript libraries
Properly defines charset
Allows users to paste into password fields
Avoids Application Cache
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Avoids requesting the geolocation permission on page load
purdue.edu 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)
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
Does not register a service worker that controls page and `start_url`
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Fast and reliable
Page load is not fast enough on mobile networks
Interactive at 21.4 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Passed Audits (5)
Content is sized correctly for the viewport
Provides a valid `apple-touch-icon`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
purdue.edu Mobile Accessibility
88/100
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 (2)
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-*]` attributes do not have valid values
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.
Buttons do not have an accessible name
Passed Audits (24)
`[role]`s have all required `[aria-*]` attributes
`[role]`s are contained by their required parent element
Heading elements appear in a sequentially-descending order
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Document has a `<title>` element
`[aria-hidden="true"]` elements do not contain focusable descendents
No element has a `[tabindex]` value greater than 0
`<html>` element has a `[lang]` attribute
Background and foreground colors have a sufficient contrast ratio
`<object>` elements have `[alt]` text
`<html>` element has a valid value for its `[lang]` attribute
ARIA IDs are unique
The page contains a heading, skip link, or landmark region
`[role]` values are valid
`<frame>` or `<iframe>` elements have a title
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Form elements have associated labels
`[aria-*]` attributes are valid and not misspelled
Image elements have `[alt]` attributes
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[aria-hidden="true"]` is not present on the document `<body>`
Links have a discernible name
`[aria-*]` attributes match their roles
Mobile Usability
99/100
These checks validate how easily a visitor can use purdue.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).
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
63/100
These checks analyze the performance of purdue.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)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Prioritize visible content
Leverage browser caching
Minify HTML
Enable compression
Minify CSS
Optimize images
Minify JavaScript
Passed Audits (2)
Avoid landing page redirects
Reduce server response time
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