Stanford.edu Stanford University
Stanford University, one of the world's leading teaching and research institutions, is dedicated to finding solutions to big challenges and to prepari...
stanford.edu Desktop Performance
64/100
These metrics represent real-world Chrome users experience viewing stanford.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 Paint5/100 5.7 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index55/100 2.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint74/100 1.2 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive91/100 2.4 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time100/100 20 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Cumulative Layout Shift100/100 0.004
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (14)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Properly size images
Potential savings of 7,337 KiB
6,800 ms
Serve images in next-gen formats
Potential savings of 5,142 KiB
4,770 ms
Efficiently encode images
Potential savings of 3,791 KiB
3,520 ms
Remove unused CSS
Potential savings of 49 KiB
440 ms
Eliminate render-blocking resources
Potential savings of 380 ms
380 ms
Reduce initial server response time
Root document took 750 ms
148 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 enormous network payloads
Total size was 9,816 KiB
Serve static assets with an efficient cache policy
9 resources found
Avoid large layout shifts
5 elements found
Avoid long main-thread tasks
6 long tasks found
Avoid chaining critical requests
23 chains found
Keep request counts low and transfer sizes small
59 requests • 9,816 KiB
Largest Contentful Paint element
1 element found
Passed Audits (15)
Avoid multiple page redirects
Potential savings of 190 ms
Enable text compression
Preconnect to required origins
Uses passive listeners to improve scrolling performance
Avoids `document.write()`
Minify CSS
Minimizes main-thread work
1.3 s
Preload key requests
Use video formats for animated content
JavaScript execution time
0.2 s
Avoids an excessive DOM size
637 elements
Minify JavaScript
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Defer offscreen images
Remove unused JavaScript
stanford.edu Desktop SEO
100/100
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.
Passed Audits (12)
Document has a `<title>` element
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page has successful HTTP status code
Document avoids plugins
Links have descriptive text
Page isn’t blocked from indexing
Document has a valid `rel=canonical`
Document has a meta description
Links are crawlable
Image elements have `[alt]` attributes
Document has a valid `hreflang`
robots.txt is valid
stanford.edu Desktop Best Practices
85/100
These checks highlight opportunities to improve the overall code health of stanford.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
Includes front-end JavaScript libraries with known security vulnerabilities
4 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Passed Audits (12)
Displays images with correct aspect ratio
Avoids requesting the notification permission on page load
Avoids requesting the geolocation permission on page load
Avoids Application Cache
Links to cross-origin destinations are safe
Allows users to paste into password fields
No browser errors logged to the console
Properly defines charset
Page has the HTML doctype
Detected JavaScript libraries
Avoids deprecated APIs
Serves images with appropriate resolution
stanford.edu Desktop Progressive Web App
22/100
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)
Fast and reliable
`start_url` does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 29.1 s
Current page does not respond with a 200 when offline
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.
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
Passed Audits (4)
Provides a valid `apple-touch-icon`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
stanford.edu Desktop Accessibility
100/100
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.
Passed Audits (24)
`[aria-hidden="true"]` elements do not contain focusable descendents
`[role]`s are contained by their required parent element
Buttons have an accessible name
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Document has a `<title>` element
`[aria-*]` attributes are valid and not misspelled
`<html>` element has a valid value for its `[lang]` attribute
Background and foreground colors have a sufficient contrast ratio
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
No element has a `[tabindex]` value greater than 0
Heading elements appear in a sequentially-descending order
Links have a discernible name
ARIA IDs are unique
`[aria-*]` attributes match their roles
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[id]` attributes on active, focusable elements are unique
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]` values are valid
`[aria-*]` attributes have valid values
`[role]`s have all required `[aria-*]` attributes
`<html>` element has a `[lang]` attribute
The page contains a heading, skip link, or landmark region
Image elements have `[alt]` attributes
`[aria-hidden="true"]` is not present on the document `<body>`
Desktop Speed
73/100
These checks analyze the performance of stanford.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 (6)
Enable compression
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Leverage browser caching
Minify JavaScript
Minify HTML
Passed Audits (4)
Avoid landing page redirects
Reduce server response time
Minify CSS
Prioritize visible content
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