C9.io AWS Cloud9 Amazon Web Services
AWS Cloud9 is a cloud-based integrated development environment (IDE) that lets you write, run, and debug your code with just a browser.
c9.io Desktop Performance
52/100
These metrics represent real-world Chrome users experience viewing c9.io 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
First Contentful Paint
First Input Delay
Cumulative Layout Shift
Metrics
Total Blocking Time10/100 830 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
Time to Interactive33/100 5.5 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index46/100 2.4 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
First Contentful Paint80/100 1.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Largest Contentful Paint81/100 1.5 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Cumulative Layout Shift100/100 0.001
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (21)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 686 KiB
1,800 ms
Serve images in next-gen formats
Potential savings of 1,236 KiB
840 ms
Properly size images
Potential savings of 1,159 KiB
780 ms
Avoid multiple page redirects
Potential savings of 570 ms
570 ms
Defer offscreen images
Potential savings of 1,036 KiB
560 ms
Eliminate render-blocking resources
Potential savings of 420 ms
417 ms
Remove unused CSS
Potential savings of 117 KiB
220 ms
Efficiently encode images
Potential savings of 46 KiB
80 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Avoid an excessive DOM size
4,262 elements
Ensure text remains visible during webfont load
Does not use passive listeners to improve scrolling performance
Serve static assets with an efficient cache policy
13 resources found
Avoid enormous network payloads
Total size was 4,130 KiB
Minimize main-thread work
3.0 s
Reduce JavaScript execution time
1.7 s
Keep request counts low and transfer sizes small
186 requests • 4,130 KiB
Avoid chaining critical requests
12 chains found
Avoid large layout shifts
5 elements found
Avoid long main-thread tasks
9 long tasks found
User Timing marks and measures
12 user timings
Largest Contentful Paint element
1 element found
Passed Audits (9)
Enable text compression
Avoids `document.write()`
Use video formats for animated content
Preconnect to required origins
Preload key requests
Minify JavaScript
Minify CSS
Minimize third-party usage
Third-party code blocked the main thread for 170 ms
Initial server response time was short
Root document took 240 ms
c9.io 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)
Content Best Practices
Format your HTML in a way that enables crawlers to better understand your app’s content.
Links do not have descriptive text
1 link found
Passed Audits (11)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Document has a valid `hreflang`
Page isn’t blocked from indexing
Document has a `<title>` element
Image elements have `[alt]` attributes
robots.txt is valid
Document avoids plugins
Links are crawlable
Page has successful HTTP status code
Document has a valid `rel=canonical`
Document has a meta description
c9.io Desktop Best Practices
62/100
These checks highlight opportunities to improve the overall code health of c9.io 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 (5)
Trust and Safety
Does not use HTTPS
1 insecure request found
Includes front-end JavaScript libraries with known security vulnerabilities
2 vulnerabilities detected
Links to cross-origin destinations are unsafe
General
Browser errors were logged to the console
Browser Compatibility
Page lacks the HTML doctype, thus triggering quirks-mode
Passed Audits (9)
Displays images with correct aspect ratio
Serves images with appropriate resolution
Allows users to paste into password fields
Avoids requesting the notification permission on page load
Avoids deprecated APIs
Detected JavaScript libraries
Properly defines charset
Avoids Application Cache
Avoids requesting the geolocation permission on page load
c9.io Desktop Progressive Web App
22/100
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)
PWA Optimized
Does not set a theme color for the address bar.
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Installable
Does not use HTTPS
1 insecure request found
Web app manifest does not meet the installability requirements
Does not register a service worker that controls page and `start_url`
Fast and reliable
Page load is not fast enough on mobile networks
Interactive on simulated mobile network at 26.0 s
Current page does not respond with a 200 when offline
`start_url` does not respond with a 200 when offline
Passed Audits (4)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Provides a valid `apple-touch-icon`
Redirects HTTP traffic to HTTPS
Contains some content when JavaScript is not available
c9.io Desktop Accessibility
97/100
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)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
Contrast
These are opportunities to improve the legibility of your content.
Background and foreground colors do not have a sufficient contrast ratio.
Passed Audits (24)
`[aria-*]` attributes are valid and not misspelled
ARIA IDs are unique
`[role]`s have all required `[aria-*]` attributes
`[aria-hidden="true"]` is not present on the document `<body>`
`[lang]` attributes have a valid value
No element has a `[tabindex]` value greater than 0
`[id]` attributes on active, focusable elements are unique
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
`<html>` element has a `[lang]` attribute
The page contains a heading, skip link, or landmark region
`[role]` values are valid
`[role]`s are contained by their required parent element
`[aria-hidden="true"]` elements do not contain focusable descendents
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
Buttons have an accessible name
`[aria-*]` attributes have valid values
Document has a `<title>` element
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Image elements have `[alt]` attributes
`<frame>` or `<iframe>` elements have a title
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
`<html>` element has a valid value for its `[lang]` attribute
Links have a discernible name
`[aria-*]` attributes match their roles
Desktop Speed
31/100
These checks analyze the performance of c9.io 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 (5)
Optimize images
Enable compression
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Avoid landing page redirects
Leverage browser caching
Passed Audits (5)
Reduce server response time
Minify CSS
Minify HTML
Minify JavaScript
Prioritize visible content
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