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Harvard University is devoted to excellence in teaching, learning, and research, and to developing leaders in many disciplines who make a difference g...
harvard.edu Mobile Performance
38/100
These metrics represent real-world Chrome users experience viewing harvard.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 Input Delay
Largest Contentful Paint
Cumulative Layout Shift
First Contentful Paint
Metrics
Largest Contentful Paint0/100 16.0 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive12/100 13.3 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time48/100 620 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index51/100 5.7 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint77/100 2.9 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 (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 1,637 KiB
9,300 ms
Efficiently encode images
Potential savings of 1,125 KiB
6,450 ms
Remove unused JavaScript
Potential savings of 523 KiB
3,000 ms
Properly size images
Potential savings of 413 KiB
2,100 ms
Avoid multiple page redirects
Potential savings of 1,110 ms
1,110 ms
Remove unused CSS
Potential savings of 65 KiB
450 ms
Eliminate render-blocking resources
Potential savings of 150 ms
150 ms
Minify JavaScript
Potential savings of 11 KiB
150 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
Reduce the impact of third-party code
Third-party code blocked the main thread for 900 ms
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
10 resources found
Avoid enormous network payloads
Total size was 3,731 KiB
Minimize main-thread work
3.4 s
Reduce JavaScript execution time
1.8 s
Avoid chaining critical requests
14 chains found
Avoid long main-thread tasks
11 long tasks found
User Timing marks and measures
3 user timings
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
60 requests • 3,731 KiB
Passed Audits (9)
Avoids an excessive DOM size
368 elements
Initial server response time was short
Root document took 120 ms
Defer offscreen images
Enable text compression
Use video formats for animated content
Minify CSS
Avoids `document.write()`
Preconnect to required origins
Preload key requests
harvard.edu Mobile SEO
92/100
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.
Document does not have a valid `rel=canonical`
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
97% appropriately sized tap targets
Passed Audits (12)
Document has a meta description
Page has successful HTTP status code
Document avoids plugins
Image elements have `[alt]` attributes
Links have descriptive text
Document uses legible font sizes
99.39% legible text
Page isn’t blocked from indexing
Document has a `<title>` element
Links are crawlable
robots.txt is valid
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document has a valid `hreflang`
harvard.edu Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of harvard.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
4 vulnerabilities detected
General
Browser errors were logged to the console
Passed Audits (11)
Avoids requesting the notification permission on page load
Allows users to paste into password fields
Links to cross-origin destinations are safe
Avoids deprecated APIs
Serves images with appropriate resolution
Detected JavaScript libraries
Page has the HTML doctype
Avoids Application Cache
Displays images with correct aspect ratio
Avoids requesting the geolocation permission on page load
Properly defines charset
harvard.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
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Fast and reliable
`start_url` does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 13.3 s
Current page does not respond with a 200 when offline
Installable
Web app manifest does not meet the installability requirements
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Passed Audits (5)
Provides a valid `apple-touch-icon`
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Content is sized correctly for the viewport
harvard.edu Mobile Accessibility
96/100
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 do not have a sufficient contrast ratio.
Passed Audits (22)
`[aria-*]` attributes are valid and not misspelled
Image elements have `[alt]` attributes
`<html>` element has a `[lang]` attribute
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[role]`s are contained by their required parent element
The page contains a heading, skip link, or landmark region
Buttons have an accessible name
`[aria-hidden="true"]` is not present on the document `<body>`
Heading elements appear in a sequentially-descending order
`[aria-*]` attributes match their roles
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Document has a `<title>` element
`<html>` element has a valid value for its `[lang]` attribute
`[id]` attributes on active, focusable elements are unique
ARIA IDs are unique
`[aria-*]` attributes have valid values
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Links have a discernible name
`[role]` values are valid
Form elements have associated labels
`[role]`s have all required `[aria-*]` attributes
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Mobile Usability
100/100
These checks validate how easily a visitor can use harvard.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
28/100
These checks analyze the performance of harvard.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 (5)
Optimize images
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Minify JavaScript
Enable compression
Passed Audits (5)
Avoid landing page redirects
Reduce server response time
Minify CSS
Minify HTML
Prioritize visible content
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