Vrrf.org Pediatric Retinal Research Foundation
vrrf.org Mobile Performance
24/100
These metrics represent real-world Chrome users experience viewing vrrf.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.
Metrics
Largest Contentful Paint2/100 8.8 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index5/100 11.7 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint10/100 6.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Time to Interactive35/100 8.9 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time43/100 660 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 (15)
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 988 KiB
4,950 ms
Efficiently encode images
Potential savings of 734 KiB
3,750 ms
Eliminate render-blocking resources
Potential savings of 3,370 ms
3,371 ms
Remove unused JavaScript
Potential savings of 242 KiB
1,350 ms
Avoid multiple page redirects
Potential savings of 1,110 ms
1,110 ms
Remove unused CSS
Potential savings of 77 KiB
450 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
Reduce the impact of third-party code
Third-party code blocked the main thread for 980 ms
Serve static assets with an efficient cache policy
7 resources found
Minimize main-thread work
3.5 s
Reduce JavaScript execution time
2.0 s
Largest Contentful Paint element
1 element found
Keep request counts low and transfer sizes small
30 requests • 2,022 KiB
Avoid long main-thread tasks
7 long tasks found
Avoid chaining critical requests
15 chains found
Passed Audits (13)
Enable text compression
Avoids an excessive DOM size
311 elements
Minify CSS
Uses passive listeners to improve scrolling performance
Preconnect to required origins
Use video formats for animated content
Preload key requests
Initial server response time was short
Root document took 450 ms
Properly size images
Potential savings of 16 KiB
Avoids `document.write()`
Defer offscreen images
Avoids enormous network payloads
Total size was 2,022 KiB
Minify JavaScript
vrrf.org Mobile SEO
93/100
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.
Document does not have a meta description
Passed Audits (13)
Tap targets are sized appropriately
100% appropriately sized tap targets
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Image elements have `[alt]` attributes
Document has a `<title>` element
Page isn’t blocked from indexing
Document has a valid `rel=canonical`
Document avoids plugins
Links are crawlable
Page has successful HTTP status code
robots.txt is valid
Document uses legible font sizes
96.03% legible text
Document has a valid `hreflang`
Links have descriptive text
vrrf.org Mobile Best Practices
85/100
These checks highlight opportunities to improve the overall code health of vrrf.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 (2)
Trust and Safety
Links to cross-origin destinations are unsafe
Does not use HTTPS
1 insecure request found
Passed Audits (12)
Avoids deprecated APIs
Avoids front-end JavaScript libraries with known security vulnerabilities
Serves images with appropriate resolution
Avoids Application Cache
Detected JavaScript libraries
No browser errors logged to the console
Avoids requesting the notification permission on page load
Properly defines charset
Displays images with correct aspect ratio
Avoids requesting the geolocation permission on page load
Allows users to paste into password fields
Page has the HTML doctype
vrrf.org Mobile Progressive Web App
46/100
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
Current page does not respond with a 200 when offline
PWA Optimized
Manifest doesn't have a maskable icon
Does not provide a valid `apple-touch-icon`
Is not configured for a custom splash screen
Does not set a theme color for the address bar.
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 (5)
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
Page load is fast enough on mobile networks
Content is sized correctly for the viewport
vrrf.org Mobile Accessibility
90/100
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 (2)
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.
Buttons do not have an accessible name
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (17)
`[role]` values are valid
`[aria-*]` attributes have valid values
Image elements have `[alt]` attributes
Heading elements appear in a sequentially-descending order
Document has a `<title>` element
`<html>` element has a `[lang]` attribute
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
`[aria-hidden="true"]` is not present on the document `<body>`
`[aria-*]` attributes match their roles
`[aria-*]` attributes are valid and not misspelled
`[role]`s are contained by their required parent element
Links have a discernible name
`<html>` element has a valid value for its `[lang]` attribute
The page contains a heading, skip link, or landmark region
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[id]` attributes on active, focusable elements are unique
`[role]`s have all required `[aria-*]` attributes
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