Nasa.gov NASA
NASA.gov brings you the latest news, images and videos from America's space agency, pioneering the future in space exploration, scientific discovery a...
nasa.gov Desktop Performance
22/100
These metrics represent real-world Chrome users experience viewing nasa.gov 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
Cumulative Layout Shift
First Input Delay
First Contentful Paint
Largest Contentful Paint
Metrics
First Contentful Paint3/100 3.4 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Largest Contentful Paint7/100 5.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Speed Index18/100 3.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Total Blocking Time20/100 610 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive48/100 4.6 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Cumulative Layout Shift97/100 0.064
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (17)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Use video formats for animated content
Potential savings of 6,319 KiB
5,080 ms
Eliminate render-blocking resources
Potential savings of 2,660 ms
2,659 ms
Enable text compression
Potential savings of 1,952 KiB
1,760 ms
Remove unused JavaScript
Potential savings of 1,235 KiB
960 ms
Remove unused CSS
Potential savings of 393 KiB
640 ms
Serve images in next-gen formats
Potential savings of 460 KiB
400 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
38 resources found
Avoid enormous network payloads
Total size was 10,164 KiB
Minimize main-thread work
2.4 s
Reduce JavaScript execution time
1.4 s
Avoid long main-thread tasks
6 long tasks found
User Timing marks and measures
1 user timing
Keep request counts low and transfer sizes small
80 requests • 10,164 KiB
Avoid chaining critical requests
16 chains found
Largest Contentful Paint element
1 element found
Avoid large layout shifts
5 elements found
Passed Audits (13)
Minify JavaScript
Avoids `document.write()`
Initial server response time was short
Root document took 120 ms
Efficiently encode images
Potential savings of 59 KiB
Avoids an excessive DOM size
273 elements
Preconnect to required origins
Defer offscreen images
Minify CSS
Potential savings of 79 KiB
Properly size images
Preload key requests
Uses passive listeners to improve scrolling performance
Avoid multiple page redirects
Potential savings of 190 ms
Minimize third-party usage
Third-party code blocked the main thread for 60 ms
nasa.gov Desktop 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 (1)
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
Passed Audits (11)
Page has successful HTTP status code
Document has a meta description
Image elements have `[alt]` attributes
Page isn’t blocked from indexing
Links have descriptive text
Document avoids plugins
robots.txt is valid
Document has a valid `hreflang`
Document has a `<title>` element
Document has a valid `rel=canonical`
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
nasa.gov Desktop Best Practices
77/100
These checks highlight opportunities to improve the overall code health of nasa.gov 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)
General
Browser errors were logged to the console
Trust and Safety
Includes front-end JavaScript libraries with known security vulnerabilities
2 vulnerabilities detected
Does not use HTTPS
1 insecure request found
Passed Audits (11)
Allows users to paste into password fields
Avoids deprecated APIs
Displays images with correct aspect ratio
Page has the HTML doctype
Avoids requesting the geolocation permission on page load
Avoids Application Cache
Links to cross-origin destinations are safe
Detected JavaScript libraries
Serves images with appropriate resolution
Avoids requesting the notification permission on page load
Properly defines charset
nasa.gov 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)
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
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 24.2 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
PWA Optimized
Is not configured for a custom splash screen
Manifest doesn't have a maskable icon
Does not provide fallback content when JavaScript is not available
Does not set a theme color for the address bar.
Passed Audits (3)
Provides a valid `apple-touch-icon`
Redirects HTTP traffic to HTTPS
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
nasa.gov Desktop Accessibility
89/100
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 (3)
Navigation
These are opportunities to improve keyboard navigation in your application.
Some elements have a `[tabindex]` value greater than 0
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.
Links do not have a discernible name
Form elements do not have associated labels
Passed Audits (18)
`[aria-*]` attributes have valid values
Background and foreground colors have a sufficient contrast ratio
`<html>` element has a valid value for its `[lang]` attribute
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`<html>` element has a `[lang]` attribute
The page contains a heading, skip link, or landmark region
Image elements have `[alt]` attributes
`[role]` values are valid
`[id]` attributes on active, focusable elements are unique
`[aria-hidden="true"]` is not present on the document `<body>`
`[role]`s are contained by their required parent element
`[aria-*]` attributes are valid and not misspelled
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Document has a `<title>` element
`[role]`s have all required `[aria-*]` attributes
`[aria-*]` attributes match their roles
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Desktop Speed
62/100
These checks analyze the performance of nasa.gov 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 (7)
Leverage browser caching
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Optimize images
Enable compression
Prioritize visible content
Minify CSS
Minify JavaScript
Passed Audits (3)
Avoid landing page redirects
Reduce server response time
Minify HTML
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