Columbia.edu Columbia University in the City of New York
columbia.edu Desktop Performance
32/100
These metrics represent real-world Chrome users experience viewing columbia.edu 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
First Input Delay
First Contentful Paint
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Largest Contentful Paint9/100 5.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index23/100 3.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Total Blocking Time24/100 550 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive45/100 4.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint59/100 1.5 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.003
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (24)
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 3,112 KiB
2,520 ms
Defer offscreen images
Potential savings of 944 KiB
480 ms
Eliminate render-blocking resources
Potential savings of 410 ms
408 ms
Avoid multiple page redirects
Potential savings of 380 ms
380 ms
Properly size images
Potential savings of 650 KiB
360 ms
Preload key requests
Potential savings of 310 ms
310 ms
Enable text compression
Potential savings of 300 KiB
280 ms
Remove unused JavaScript
Potential savings of 280 KiB
200 ms
Remove unused CSS
Potential savings of 77 KiB
80 ms
Efficiently encode images
Potential savings of 221 KiB
80 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Does not use passive listeners to improve scrolling performance
Avoid `document.write()`
Serve static assets with an efficient cache policy
67 resources found
Ensure text remains visible during webfont load
Avoid enormous network payloads
Total size was 8,319 KiB
Avoid an excessive DOM size
1,264 elements
Minimize main-thread work
2.7 s
Reduce JavaScript execution time
1.4 s
Avoid large layout shifts
5 elements found
User Timing marks and measures
1 user timing
Avoid chaining critical requests
20 chains found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
93 requests • 8,319 KiB
Avoid long main-thread tasks
7 long tasks found
Passed Audits (6)
Use video formats for animated content
Initial server response time was short
Root document took 350 ms
Minimize third-party usage
Third-party code blocked the main thread for 10 ms
Minify JavaScript
Potential savings of 16 KiB
Minify CSS
Preconnect to required origins
columbia.edu Desktop SEO
82/100
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
Document does not have a meta description
Passed Audits (9)
Document has a `<title>` element
Document avoids plugins
Document has a valid `hreflang`
Page has successful HTTP status code
Image elements have `[alt]` attributes
Links are crawlable
Page isn’t blocked from indexing
Document has a valid `rel=canonical`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
columbia.edu Desktop Best Practices
85/100
These checks highlight opportunities to improve the overall code health of columbia.edu 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
2 insecure requests found
Includes front-end JavaScript libraries with known security vulnerabilities
18 vulnerabilities detected
Passed Audits (12)
Avoids requesting the geolocation permission on page load
Properly defines charset
No browser errors logged to the console
Links to cross-origin destinations are safe
Avoids deprecated APIs
Avoids Application Cache
Serves images with appropriate resolution
Displays images with correct aspect ratio
Page has the HTML doctype
Allows users to paste into password fields
Avoids requesting the notification permission on page load
Detected JavaScript libraries
columbia.edu Desktop Progressive Web App
19/100
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)
PWA Optimized
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Does not provide a valid `apple-touch-icon`
Does not set a theme color for the address bar.
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 20.6 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Installable
Does not use HTTPS
2 insecure requests found
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Passed Audits (3)
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
columbia.edu Desktop 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 (4)
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
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 input fields do not have accessible names
Elements with an ARIA `[role]` that require children to contain a specific `[role]` are missing some or all of those required children.
`[aria-hidden="true"]` elements contain focusable descendents
Passed Audits (21)
`<html>` element has a valid value for its `[lang]` attribute
Document has a `<title>` element
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[aria-hidden="true"]` is not present on the document `<body>`
No element has a `[tabindex]` value greater than 0
Buttons have an accessible name
The page contains a heading, skip link, or landmark region
`[role]` values are valid
`[id]` attributes on active, focusable elements are unique
ARIA IDs are unique
Image elements have `[alt]` attributes
`<html>` element has a `[lang]` attribute
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[aria-*]` attributes have valid values
`[role]`s are contained by their required parent element
Heading elements appear in a sequentially-descending order
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[aria-*]` attributes are valid and not misspelled
`[aria-*]` attributes match their roles
`[role]`s have all required `[aria-*]` attributes
Links have a discernible name
Desktop Speed
47/100
These checks analyze the performance of columbia.edu 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 (8)
Optimize images
Enable compression
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Avoid landing page redirects
Prioritize visible content
Leverage browser caching
Minify JavaScript
Minify HTML
Passed Audits (2)
Reduce server response time
Minify CSS
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