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cambridge.org Mobile Performance
45/100
These metrics represent real-world Chrome users experience viewing cambridge.org 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
Largest Contentful Paint
Cumulative Layout Shift
First Contentful Paint
First Input Delay
Metrics
Largest Contentful Paint0/100 10.9 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive15/100 12.5 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
First Contentful Paint27/100 5.2 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index61/100 5.2 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Total Blocking Time98/100 180 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
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (13)
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 133 KiB
600 ms
Eliminate render-blocking resources
Potential savings of 210 ms
210 ms
Minify JavaScript
Potential savings of 9 KiB
150 ms
Remove unused JavaScript
Potential savings of 35 KiB
150 ms
Reduce initial server response time
Root document took 660 ms
58 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
Minimize main-thread work
2.8 s
Avoid enormous network payloads
Total size was 2,992 KiB
Avoid long main-thread tasks
12 long tasks found
Keep request counts low and transfer sizes small
70 requests • 2,992 KiB
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
9 chains found
Passed Audits (15)
Remove unused CSS
Potential savings of 11 KiB
Defer offscreen images
Potential savings of 170 KiB
JavaScript execution time
0.9 s
Use video formats for animated content
Properly size images
Preconnect to required origins
Minimize third-party usage
Third-party code blocked the main thread for 160 ms
Avoid multiple page redirects
Potential savings of 630 ms
Uses passive listeners to improve scrolling performance
Preload key requests
Avoids an excessive DOM size
432 elements
Enable text compression
Avoids `document.write()`
Efficiently encode images
Minify CSS
cambridge.org Mobile 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 (3)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
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
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
60% appropriately sized tap targets
Passed Audits (11)
Page isn’t blocked from indexing
Document has a meta description
Image elements have `[alt]` attributes
Document has a `<title>` element
Document has a valid `hreflang`
robots.txt is valid
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document uses legible font sizes
97.44% legible text
Document avoids plugins
Document has a valid `rel=canonical`
Page has successful HTTP status code
cambridge.org Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of cambridge.org 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
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 front-end JavaScript libraries with known security vulnerabilities
Page has the HTML doctype
Detected JavaScript libraries
Avoids deprecated APIs
Avoids requesting the geolocation permission on page load
Avoids requesting the notification permission on page load
Avoids Application Cache
Allows users to paste into password fields
Serves images with appropriate resolution
Displays images with correct aspect ratio
Properly defines charset
cambridge.org Mobile Progressive Web App
21/100
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 set a theme color for the address bar.
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Does not provide a valid `apple-touch-icon`
Fast and reliable
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Page load is not fast enough on mobile networks
Interactive at 12.5 s
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)
Content is sized correctly for the viewport
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 Mobile 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)
`[aria-*]` attributes have valid values
`<html>` element has a valid value for its `[lang]` attribute
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[aria-hidden="true"]` elements do not contain focusable descendents
Links have a discernible name
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes match their roles
Image elements have `[alt]` attributes
Document has a `<title>` element
`[aria-*]` attributes are valid and not misspelled
`<html>` element has a `[lang]` attribute
Background and foreground colors have a sufficient contrast ratio
`[aria-hidden="true"]` is not present on the document `<body>`
ARIA IDs are unique
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
Heading elements appear in a sequentially-descending order
`[id]` attributes on active, focusable elements are unique
Mobile Usability
99/100
These checks validate how easily a visitor can use cambridge.org 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
54/100
These checks analyze the performance of cambridge.org 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)
Reduce server response time
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Minify JavaScript
Passed Audits (5)
Avoid landing page redirects
Enable compression
Minify CSS
Minify HTML
Prioritize visible content
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