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Official university site with information on undergraduate and postgraduate courses, research, teaching, study and departments. Located in Bristol, in...
bris.ac.uk Mobile Performance
38/100
These metrics represent real-world Chrome users experience viewing bris.ac.uk 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 Contentful Paint
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
Metrics
Total Blocking Time0/100 3,070 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive9/100 14.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Largest Contentful Paint42/100 4.3 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index42/100 6.3 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint98/100 1.6 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 (14)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 589 KiB
2,830 ms
Reduce initial server response time
Root document took 1,110 ms
512 ms
Serve images in next-gen formats
Potential savings of 43 KiB
300 ms
Efficiently encode images
Potential savings of 18 KiB
150 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,510 ms
Serve static assets with an efficient cache policy
21 resources found
Minimize main-thread work
7.3 s
Reduce JavaScript execution time
4.8 s
Avoid large layout shifts
4 elements found
User Timing marks and measures
2 user timings
Avoid long main-thread tasks
20 long tasks found
Avoid chaining critical requests
5 chains found
Keep request counts low and transfer sizes small
84 requests • 1,437 KiB
Largest Contentful Paint element
1 element found
Passed Audits (16)
Avoids enormous network payloads
Total size was 1,437 KiB
Eliminate render-blocking resources
Properly size images
Uses passive listeners to improve scrolling performance
Remove unused CSS
Potential savings of 11 KiB
Avoids `document.write()`
Minify JavaScript
Preconnect to required origins
Defer offscreen images
All text remains visible during webfont loads
Preload key requests
Avoids an excessive DOM size
474 elements
Use video formats for animated content
Enable text compression
Avoid multiple page redirects
Potential savings of 630 ms
Minify CSS
bris.ac.uk Mobile SEO
90/100
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.
Image elements do not have `[alt]` attributes
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
76% appropriately sized tap targets
Passed Audits (11)
robots.txt is valid
Document has a `<title>` element
Document has a valid `hreflang`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Links are crawlable
Page has successful HTTP status code
Page isn’t blocked from indexing
Document avoids plugins
Document uses legible font sizes
100% legible text
Links have descriptive text
Document has a meta description
bris.ac.uk Mobile Best Practices
92/100
These checks highlight opportunities to improve the overall code health of bris.ac.uk 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 (1)
Trust and Safety
Does not use HTTPS
1 insecure request found
Passed Audits (13)
No browser errors logged to the console
Properly defines charset
Links to cross-origin destinations are safe
Allows users to paste into password fields
Avoids requesting the geolocation permission on page load
Avoids Application Cache
Avoids requesting the notification permission on page load
Avoids deprecated APIs
Serves images with appropriate resolution
Detected JavaScript libraries
Page has the HTML doctype
Displays images with correct aspect ratio
Avoids front-end JavaScript libraries with known security vulnerabilities
bris.ac.uk 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)
Fast and reliable
Page load is not fast enough on mobile networks
Interactive at 14.6 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
PWA Optimized
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Installable
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Does not use HTTPS
1 insecure request found
Passed Audits (4)
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
Redirects HTTP traffic to HTTPS
bris.ac.uk Mobile Accessibility
85/100
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)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Tables and lists
These are opportunities to to improve the experience of reading tabular or list data using assistive technology, like a screen reader.
List items (`<li>`) are not contained within `<ul>` or `<ol>` parent elements.
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.
Image elements do not have `[alt]` attributes
Form elements do not have associated labels
Passed Audits (21)
`[id]` attributes on active, focusable elements are unique
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s have all required `[aria-*]` attributes
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Document has a `<title>` element
Links have a discernible name
`[role]` values are valid
No element has a `[tabindex]` value greater than 0
Buttons have an accessible name
`[aria-*]` attributes have valid values
`[role]`s are contained by their required parent element
`[aria-hidden="true"]` elements do not contain focusable descendents
`[aria-*]` attributes match their roles
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a `[lang]` attribute
Background and foreground colors have a sufficient contrast ratio
ARIA IDs are unique
The page contains a heading, skip link, or landmark region
`[aria-*]` attributes are valid and not misspelled
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`<html>` element has a valid value for its `[lang]` attribute
Mobile Usability
91/100
These checks validate how easily a visitor can use bris.ac.uk 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 content to viewport
Passed Audits (4)
Avoid plugins
Configure the viewport
Size tap targets appropriately
Use legible font sizes
Mobile Speed
60/100
These checks analyze the performance of bris.ac.uk 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 (6)
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Avoid landing page redirects
Optimize images
Leverage browser caching
Minify HTML
Enable compression
Passed Audits (4)
Reduce server response time
Minify CSS
Minify JavaScript
Prioritize visible content
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