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cambridge.org Desktop Performance
71/100
These metrics represent real-world Chrome users experience viewing cambridge.org 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
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Largest Contentful Paint
Metrics
Largest Contentful Paint42/100 2.7 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint45/100 1.7 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index76/100 1.7 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive83/100 2.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time100/100 0 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 0.002
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (11)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Eliminate render-blocking resources
Potential savings of 100 ms
100 ms
Reduce initial server response time
Root document took 680 ms
81 ms
Serve images in next-gen formats
Potential savings of 112 KiB
80 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
Serve static assets with an efficient cache policy
55 resources found
Avoid enormous network payloads
Total size was 2,991 KiB
Avoid chaining critical requests
9 chains found
Avoid long main-thread tasks
2 long tasks found
Avoid large layout shifts
5 elements found
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
68 requests • 2,991 KiB
Passed Audits (18)
Use video formats for animated content
Avoids an excessive DOM size
432 elements
Remove unused JavaScript
Potential savings of 55 KiB
Avoids `document.write()`
JavaScript execution time
0.2 s
Minify CSS
Minimize third-party usage
Third-party code blocked the main thread for 0 ms
Preload key requests
Properly size images
Minimizes main-thread work
0.8 s
Minify JavaScript
Potential savings of 9 KiB
Enable text compression
Uses passive listeners to improve scrolling performance
Remove unused CSS
Potential savings of 10 KiB
Defer offscreen images
Potential savings of 105 KiB
Avoid multiple page redirects
Potential savings of 190 ms
Efficiently encode images
Preconnect to required origins
cambridge.org Desktop SEO
83/100
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
1 link found
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (10)
Document avoids plugins
Document has a valid `hreflang`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page has successful HTTP status code
Document has a `<title>` element
robots.txt is valid
Image elements have `[alt]` attributes
Page isn’t blocked from indexing
Document has a meta description
Document has a valid `rel=canonical`
cambridge.org Desktop Best Practices
77/100
These checks highlight opportunities to improve the overall code health of cambridge.org 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
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
General
Browser errors were logged to the console
Passed Audits (11)
Avoids requesting the notification permission on page load
Page has the HTML doctype
Avoids deprecated APIs
Serves images with appropriate resolution
Avoids front-end JavaScript libraries with known security vulnerabilities
Allows users to paste into password fields
Avoids Application Cache
Properly defines charset
Displays images with correct aspect ratio
Detected JavaScript libraries
Avoids requesting the geolocation permission on page load
cambridge.org 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
Does not provide a valid `apple-touch-icon`
Manifest doesn't have a maskable icon
Does not set a theme color for the address bar.
Is not configured for a custom splash screen
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
Fast and reliable
Current page does not respond with a 200 when offline
`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 12.8 s
Passed Audits (3)
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
cambridge.org Desktop Accessibility
91/100
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 (1)
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.
Form elements do not have associated labels
Passed Audits (18)
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Heading elements appear in a sequentially-descending order
`<html>` element has a `[lang]` attribute
`[id]` attributes on active, focusable elements are unique
The page contains a heading, skip link, or landmark region
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.
Document has a `<title>` element
`[aria-hidden="true"]` elements do not contain focusable descendents
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Links have a discernible name
Image elements have `[alt]` attributes
`[aria-*]` attributes match their roles
`<html>` element has a valid value for its `[lang]` attribute
`[aria-*]` attributes have valid values
`[aria-*]` attributes are valid and not misspelled
ARIA IDs are unique
`[aria-hidden="true"]` is not present on the document `<body>`
Desktop Speed
47/100
These checks analyze the performance of cambridge.org 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)
Optimize images
Reduce server response time
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Minify HTML
Minify CSS
Passed Audits (4)
Avoid landing page redirects
Enable compression
Minify JavaScript
Prioritize visible content
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