Nih.gov National Institutes of Health (NIH) | Turning Discovery Into Health
Official website of the National Institutes of Health (NIH). NIH is one of the world's foremost medical research centers. An agency of the U.S. Depart...
nih.gov Mobile Performance
41/100
These metrics represent real-world Chrome users experience viewing nih.gov 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
Cumulative Layout Shift
Largest Contentful Paint
First Contentful Paint
First Input Delay
Metrics
Largest Contentful Paint8/100 6.7 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
First Contentful Paint35/100 4.7 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Speed Index40/100 6.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Time to Interactive53/100 7.0 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Total Blocking Time60/100 520 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 (16)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Eliminate render-blocking resources
Potential savings of 2,100 ms
2,095 ms
Avoid multiple page redirects
Potential savings of 1,110 ms
1,110 ms
Preload key requests
Potential savings of 1,020 ms
1,020 ms
Remove unused JavaScript
Potential savings of 76 KiB
600 ms
Remove unused CSS
Potential savings of 23 KiB
300 ms
Minify JavaScript
Potential savings of 12 KiB
300 ms
Serve images in next-gen formats
Potential savings of 28 KiB
150 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
Does not use passive listeners to improve scrolling performance
Serve static assets with an efficient cache policy
38 resources found
Minimize main-thread work
3.2 s
Avoids an excessive DOM size
783 elements
Avoid chaining critical requests
18 chains found
Keep request counts low and transfer sizes small
52 requests • 589 KiB
Avoid long main-thread tasks
10 long tasks found
Largest Contentful Paint element
1 element found
Passed Audits (12)
Properly size images
Potential savings of 10 KiB
Avoids enormous network payloads
Total size was 589 KiB
Initial server response time was short
Root document took 400 ms
Preconnect to required origins
JavaScript execution time
1.0 s
Defer offscreen images
Avoids `document.write()`
Minimize third-party usage
Third-party code blocked the main thread for 100 ms
Minify CSS
Use video formats for animated content
Enable text compression
Efficiently encode images
nih.gov Mobile SEO
92/100
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)
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
97% appropriately sized tap targets
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (12)
Document avoids plugins
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Image elements have `[alt]` attributes
robots.txt is valid
Page isn’t blocked from indexing
Document has a valid `hreflang`
Document has a `<title>` element
Document has a valid `rel=canonical`
Page has successful HTTP status code
Document has a meta description
Document uses legible font sizes
99.97% legible text
Links have descriptive text
nih.gov Mobile Best Practices
69/100
These checks highlight opportunities to improve the overall code health of nih.gov 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 (4)
User Experience
Serves images with low resolution
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
6 vulnerabilities detected
Does not use HTTPS
1 insecure request found
General
Browser errors were logged to the console
Passed Audits (10)
Avoids requesting the geolocation permission on page load
Detected JavaScript libraries
Links to cross-origin destinations are safe
Page has the HTML doctype
Allows users to paste into password fields
Avoids requesting the notification permission on page load
Avoids Application Cache
Avoids deprecated APIs
Displays images with correct aspect ratio
Properly defines charset
nih.gov 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
Content is not sized correctly for the viewport
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`
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Passed Audits (5)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
Page load is fast enough on mobile networks
Provides a valid `apple-touch-icon`
nih.gov Mobile Accessibility
99/100
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)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Passed Audits (22)
`[role]`s have all required `[aria-*]` attributes
`[lang]` attributes have a valid value
`<html>` element has a `[lang]` attribute
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.
`[aria-*]` attributes have valid values
Image elements have `[alt]` attributes
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`[aria-hidden="true"]` is not present on the document `<body>`
Links have a discernible name
No element has a `[tabindex]` value greater than 0
The page contains a heading, skip link, or landmark region
Document has a `<title>` element
`[aria-*]` attributes match their roles
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a valid value for its `[lang]` attribute
Background and foreground colors have a sufficient contrast ratio
`[role]` values are valid
Buttons have an accessible name
`[aria-*]` attributes are valid and not misspelled
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]`s are contained by their required parent element
Mobile Usability
99/100
These checks validate how easily a visitor can use nih.gov 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
67/100
These checks analyze the performance of nih.gov 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 (7)
Avoid landing page redirects
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Leverage browser caching
Optimize images
Minify JavaScript
Minify CSS
Enable compression
Passed Audits (3)
Reduce server response time
Minify HTML
Prioritize visible content
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