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colorado.edu Mobile Performance
22/100
These metrics represent real-world Chrome users experience viewing colorado.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
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
Metrics
Largest Contentful Paint0/100 12.6 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive4/100 17.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint25/100 5.3 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index26/100 7.6 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Total Blocking Time46/100 640 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift54/100 0.232
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (22)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Defer offscreen images
Potential savings of 815 KiB
3,450 ms
Eliminate render-blocking resources
Potential savings of 2,410 ms
2,413 ms
Serve images in next-gen formats
Potential savings of 389 KiB
1,950 ms
Properly size images
Potential savings of 279 KiB
1,800 ms
Remove unused JavaScript
Potential savings of 390 KiB
1,650 ms
Efficiently encode images
Potential savings of 213 KiB
1,050 ms
Remove unused CSS
Potential savings of 60 KiB
900 ms
Enable text compression
Potential savings of 61 KiB
150 ms
Minify JavaScript
Potential savings of 21 KiB
150 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
Avoid `document.write()`
Reduce the impact of third-party code
Third-party code blocked the main thread for 330 ms
Does not use passive listeners to improve scrolling performance
Serve static assets with an efficient cache policy
53 resources found
Minimize main-thread work
4.6 s
Reduce JavaScript execution time
1.5 s
Avoids enormous network payloads
Total size was 2,537 KiB
Avoid chaining critical requests
28 chains found
Avoid large layout shifts
4 elements found
Keep request counts low and transfer sizes small
249 requests • 2,537 KiB
Largest Contentful Paint element
1 element found
Avoid long main-thread tasks
14 long tasks found
Passed Audits (7)
Avoid multiple page redirects
Potential savings of 630 ms
Use video formats for animated content
Minify CSS
Initial server response time was short
Root document took 200 ms
Preload key requests
Avoids an excessive DOM size
648 elements
Preconnect to required origins
colorado.edu Mobile SEO
86/100
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
3 links found
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (12)
Document uses legible font sizes
99.7% legible text
Document has a `<title>` element
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page has successful HTTP status code
Image elements have `[alt]` attributes
Document avoids plugins
Document has a valid `hreflang`
Page isn’t blocked from indexing
Document has a valid `rel=canonical`
robots.txt is valid
Tap targets are sized appropriately
100% appropriately sized tap targets
Document has a meta description
colorado.edu Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of colorado.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 (3)
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
5 vulnerabilities detected
General
Browser errors were logged to the console
Passed Audits (11)
Avoids requesting the notification permission on page load
Displays images with correct aspect ratio
Avoids Application Cache
Avoids requesting the geolocation permission on page load
Avoids deprecated APIs
Allows users to paste into password fields
Serves images with appropriate resolution
Properly defines charset
Detected JavaScript libraries
Page has the HTML doctype
Links to cross-origin destinations are safe
colorado.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)
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
Fast and reliable
Page load is not fast enough on mobile networks
Interactive at 17.9 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
PWA Optimized
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.
Passed Audits (5)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Content is sized correctly for the viewport
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
Provides a valid `apple-touch-icon`
colorado.edu Mobile Accessibility
0/100
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)
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.
`<frame>` or `<iframe>` elements do not have a title
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors have a sufficient contrast ratio
Passed Audits (23)
ARIA IDs are unique
Document has a `<title>` element
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]` values are valid
Image elements have `[alt]` attributes
`[id]` attributes on active, focusable elements are unique
`<html>` element has a valid value for its `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
`[aria-*]` attributes have valid values
`[aria-hidden="true"]` is not present on the document `<body>`
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes match their roles
`[role]`s are contained by their required parent element
`<html>` element has a `[lang]` attribute
Heading elements appear in a sequentially-descending order
`[aria-hidden="true"]` elements do not contain focusable descendents
Links have a discernible name
No element has a `[tabindex]` value greater than 0
`[role]`s have all required `[aria-*]` attributes
Mobile Usability
99/100
These checks validate how easily a visitor can use colorado.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
59/100
These checks analyze the performance of colorado.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 (6)
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Enable compression
Minify JavaScript
Optimize images
Passed Audits (4)
Reduce server response time
Minify CSS
Minify HTML
Prioritize visible content
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