Bris.ac.uk Homepage | University of Bristol
Official university site with information on undergraduate and postgraduate courses, research, teaching, study and departments. Located in Bristol, in...
bris.ac.uk Desktop Performance
79/100
These metrics represent real-world Chrome users experience viewing bris.ac.uk 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
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Metrics
Total Blocking Time53/100 340 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Speed Index73/100 1.8 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive80/100 3.0 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Largest Contentful Paint91/100 1.2 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint100/100 0.5 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0.028
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (10)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Reduce initial server response time
Root document took 1,010 ms
409 ms
Remove unused JavaScript
Potential savings of 623 KiB
360 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Serve static assets with an efficient cache policy
20 resources found
Minimizes main-thread work
1.8 s
Avoid large layout shifts
5 elements found
User Timing marks and measures
2 user timings
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
5 chains found
Avoid long main-thread tasks
5 long tasks found
Keep request counts low and transfer sizes small
84 requests • 1,428 KiB
Passed Audits (20)
Defer offscreen images
Avoids `document.write()`
Eliminate render-blocking resources
Properly size images
Preconnect to required origins
Minify JavaScript
Serve images in next-gen formats
Potential savings of 43 KiB
All text remains visible during webfont loads
JavaScript execution time
0.9 s
Uses passive listeners to improve scrolling performance
Use video formats for animated content
Preload key requests
Avoids an excessive DOM size
474 elements
Avoid multiple page redirects
Potential savings of 190 ms
Remove unused CSS
Efficiently encode images
Potential savings of 18 KiB
Minimize third-party usage
Third-party code blocked the main thread for 170 ms
Minify CSS
Enable text compression
Avoids enormous network payloads
Total size was 1,428 KiB
bris.ac.uk Desktop SEO
91/100
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 (1)
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
Passed Audits (10)
Document has a valid `hreflang`
Document has a `<title>` element
Page has successful HTTP status code
Page isn’t blocked from indexing
Document avoids plugins
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Links are crawlable
Document has a meta description
Links have descriptive text
robots.txt is valid
bris.ac.uk Desktop Best Practices
92/100
These checks highlight opportunities to improve the overall code health of bris.ac.uk 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)
Serves images with appropriate resolution
Properly defines charset
No browser errors logged to the console
Page has the HTML doctype
Avoids deprecated APIs
Avoids front-end JavaScript libraries with known security vulnerabilities
Avoids Application Cache
Avoids requesting the geolocation permission on page load
Displays images with correct aspect ratio
Allows users to paste into password fields
Avoids requesting the notification permission on page load
Detected JavaScript libraries
Links to cross-origin destinations are safe
bris.ac.uk 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
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Does not set a theme color for the address bar.
Installable
Does not use HTTPS
1 insecure request found
Does not register a service worker that controls page and `start_url`
Web app manifest does not meet the installability requirements
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 14.5 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Passed Audits (3)
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
bris.ac.uk Desktop 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)
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
Image elements do not have `[alt]` attributes
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.
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Passed Audits (21)
`<html>` element has a valid value for its `[lang]` attribute
`[aria-*]` attributes are valid and not misspelled
`<html>` element has a `[lang]` attribute
`[role]`s are contained by their required parent element
Document has a `<title>` element
`[aria-*]` attributes have valid values
`[aria-*]` attributes match their roles
`[role]`s have all required `[aria-*]` attributes
`[id]` attributes on active, focusable elements are unique
Background and foreground colors have a sufficient contrast ratio
ARIA IDs are unique
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[role]` values are valid
`[aria-hidden="true"]` is not present on the document `<body>`
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
The page contains a heading, skip link, or landmark region
Links have a discernible name
No element has a `[tabindex]` value greater than 0
`[aria-hidden="true"]` elements do not contain focusable descendents
Buttons have an accessible name
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Desktop Speed
93/100
These checks analyze the performance of bris.ac.uk 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 (3)
Leverage browser caching
Enable compression
Minify HTML
Passed Audits (7)
Avoid landing page redirects
Reduce server response time
Minify CSS
Minify JavaScript
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Prioritize visible content
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