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Open-source electronic prototyping platform enabling users to create interactive electronic objects.
arduino.cc Mobile Performance
16/100
These metrics represent real-world Chrome users experience viewing arduino.cc 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
First Contentful Paint
First Input Delay
Cumulative Layout Shift
Largest Contentful Paint
Metrics
Largest Contentful Paint0/100 13.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn More
Time to Interactive7/100 15.8 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more.
Speed Index16/100 8.8 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more.
Total Blocking Time17/100 1,040 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more.
First Contentful Paint24/100 5.4 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more.
Cumulative Layout Shift100/100 0
Cumulative Layout Shift measures the movement of visible elements within the viewport. Learn more.
Should Fix (20)
Opportunities
These suggestions can help your page load faster. They don't directly affect the Performance score.
Remove unused JavaScript
Potential savings of 498 KiB
6,750 ms
Serve images in next-gen formats
Potential savings of 1,137 KiB
4,950 ms
Preload key requests
Potential savings of 4,680 ms
4,680 ms
Defer offscreen images
Potential savings of 701 KiB
3,300 ms
Efficiently encode images
Potential savings of 387 KiB
1,650 ms
Eliminate render-blocking resources
Potential savings of 1,240 ms
1,238 ms
Avoid multiple page redirects
Potential savings of 1,110 ms
1,110 ms
Remove unused CSS
Potential savings of 70 KiB
750 ms
Diagnostics
More information about the performance of your application. These numbers don't directly affect the Performance score.
Does not use passive listeners to improve scrolling performance
Reduce the impact of third-party code
Third-party code blocked the main thread for 1,130 ms
Ensure text remains visible during webfont load
Serve static assets with an efficient cache policy
35 resources found
Minimize main-thread work
4.3 s
Reduce JavaScript execution time
2.6 s
Avoids enormous network payloads
Total size was 2,554 KiB
Avoid long main-thread tasks
9 long tasks found
User Timing marks and measures
3 user timings
Largest Contentful Paint element
1 element found
Avoid chaining critical requests
8 chains found
Keep request counts low and transfer sizes small
69 requests • 2,554 KiB
Passed Audits (9)
Use video formats for animated content
Enable text compression
Minify CSS
Preconnect to required origins
Avoids an excessive DOM size
524 elements
Properly size images
Potential savings of 7 KiB
Initial server response time was short
Root document took 550 ms
Minify JavaScript
Avoids `document.write()`
arduino.cc Mobile SEO
83/100
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 (3)
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
82% appropriately sized tap targets
Crawling and Indexing
To appear in search results, crawlers need access to your app.
Links are not crawlable
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)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Page isn’t blocked from indexing
Document uses legible font sizes
100% legible text
Links have descriptive text
Page has successful HTTP status code
Document has a meta description
Document has a `<title>` element
Document avoids plugins
Document has a valid `hreflang`
robots.txt is valid
arduino.cc Mobile Best Practices
77/100
These checks highlight opportunities to improve the overall code health of arduino.cc 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 (3)
Trust and Safety
Does not use HTTPS
1 insecure request found
Links to cross-origin destinations are unsafe
General
Browser errors were logged to the console
Passed Audits (11)
Avoids front-end JavaScript libraries with known security vulnerabilities
Detected JavaScript libraries
Avoids deprecated APIs
Serves images with appropriate resolution
Avoids Application Cache
Avoids requesting the geolocation permission on page load
Page has the HTML doctype
Avoids requesting the notification permission on page load
Allows users to paste into password fields
Properly defines charset
Displays images with correct aspect ratio
arduino.cc Mobile Progressive Web App
21/100
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
Does not set a theme color for the address bar.
Does not provide a valid `apple-touch-icon`
Manifest doesn't have a maskable icon
Is not configured for a custom splash screen
Installable
Web app manifest does not meet the installability requirements
Does not use HTTPS
1 insecure request found
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 at 15.8 s
`start_url` does not respond with a 200 when offline
Current page does not respond with a 200 when offline
Passed Audits (4)
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
Contains some content when JavaScript is not available
Redirects HTTP traffic to HTTPS
Content is sized correctly for the viewport
arduino.cc Mobile 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 (4)
Navigation
These are opportunities to improve keyboard navigation in your application.
Heading elements are not in a sequentially-descending order
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.
Image elements do not have `[alt]` attributes
Links do not have a discernible 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 (20)
`[aria-hidden="true"]` elements do not contain focusable descendents
`[aria-*]` attributes are valid and not misspelled
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
The page contains a heading, skip link, or landmark region
`<html>` element has a `[lang]` attribute
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.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
`[role]` values are valid
Form elements have associated labels
ARIA IDs are unique
`[role]`s have all required `[aria-*]` attributes
`[aria-hidden="true"]` is not present on the document `<body>`
`[aria-*]` attributes match their roles
`[id]` attributes on active, focusable elements are unique
`[aria-*]` attributes have valid values
Buttons have an accessible name
`<html>` element has a valid value for its `[lang]` attribute
Document has a `<title>` element
`[role]`s are contained by their required parent element
Mobile Usability
66/100
These checks validate how easily a visitor can use arduino.cc 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 (3)
Use legible font sizes
Configure the viewport
Size tap targets appropriately
Passed Audits (2)
Avoid plugins
Size content to viewport
Mobile Speed
39/100
These checks analyze the performance of arduino.cc 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 (8)
Leverage browser caching
Eliminate render-blocking JavaScript and CSS in above-the-fold content
Avoid landing page redirects
Minify CSS
Optimize images
Enable compression
Minify JavaScript
Minify HTML
Passed Audits (2)
Reduce server response time
Prioritize visible content
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