Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page. It has audits for performance, accessibility, progressive web apps, and more. It’s not just for developers.

How do you run a Lighthouse audit?

To run an audit:

  1. In Chrome, go to the page you want to audit.
  2. Click Lighthouse. . It should be next to the Chrome address bar. …
  3. Click Generate report. Lighthouse runs its audits against the currently-focused page, then opens up a new tab with a report of the results. Figure 4.

What is a good Lighthouse score?

90 to 100

These are the Lighthouse score ranges: 0 to 49 (red): Poor. 50 to 89 (orange): Needs Improvement. 90 to 100 (green): Good.

What are Lighthouse best practices?

Best Practices

Lighthouse analyzes whether HTTPS and HTTP/2 are used, checks to see whether resources come from secure sources and assesses the vulnerability of JavaScript libraries. Other best practices look at secure database connections and avoiding the use of non-secure commands, such as document.

How does a Lighthouse tool work?

Basically, Lighthouse works with developer best practices and performance metrics. It runs checks on a web app and gives you feedback on errors, practices below standard, tips for better performance and how to fix them. Lighthouse is an open-source, automated tool for improving the quality of web pages.

What does Lighthouse mean?

Definition of lighthouse

1 : a structure (such as a tower) with a powerful light that gives a continuous or intermittent signal to navigators.

What is Lighthouse CI?

Lighthouse CI is a suite of tools for using Lighthouse during continuous integration. Lighthouse CI can be incorporated into developer workflows in many different ways. This guide covers the following topics: Using the Lighthouse CI CLI. Configuring your CI provider to run Lighthouse CI.

Do Lighthouse scores matter?

A question is asked about low performance scores in Lighthouse and whether they negatively impact organic search rankings. The user notes they’ve managed to raise the score from 6 to 21, but there’s still a ways to go considering the top score is 100. Fortunately for them, Lighthouse scores don’t directly impact SEO.

Are Lighthouse scores important?

The more users who can access your site, the more potential business you could receive. A high Lighthouse score also means that you have a well performing website. The speed that a page loads at is extremely important as users do not want to sit around waiting for your webpage to load.

How do you read a Lighthouse report?

Lighthouse provides a summary of the page tested using scores and easy-to-understand visual cues: green applies to scores between 90 and 100 and is considered good, orange means that the score is average and applies to those between 50 and 89, and red applies to scores between 0 and 49 which are considered poor.

How can I improve my lighthouse score?

These five tips got you covered and will help you boost your score:

  1. Make PWAs your superpower. …
  2. Run Lighthouse from web.dev. …
  3. Implement the lazy loading technique. …
  4. Master the techniques of code splitting and server-side rendering. …
  5. Make Lighthouse CI your gatekeeper.

What is script evaluation lighthouse?

Effectively, script evaluation is the stage between parsing the script and executing the script. The problem is that this script evaluation time can block the main thread hurting your user experience and your scores in page performance measurement tools such as Lighthouse.

How do I use Lighthouse incognito?

Here’s how to “enable” the Lighthouse Chrome extension.

  1. Open your normal Chrome browser, click the menu button (three dots at the top right). Then go to More Tools > Extensions.
  2. Scroll to the Lighthouse Chrome extension and click Details.
  3. Now enable the setting “Allow in Incognito”

Does Google lighthouse work offline?

Lighthouse emulates an offline connection using the Chrome Remote Debugging Protocol and then attempts to retrieve the page using XMLHttpRequest . In the Lighthouse report UI the full PWA badge is given when you pass all of the audits in all of the PWA subcategories (Fast and reliable, Installable, and PWA optimized).

What is Lighthouse CLI?

Lighthouse analyzes web apps and web pages, collecting modern performance metrics and insights on developer best practices. Using Lighthouse. Using Lighthouse in Chrome DevTools. Using the Chrome extension. Using the Node CLI.

What is Lighthouse Treemap?

Lighthouse Treemap is a new tool that helps us evaluate the efficiency of the JavaScript on our websites. It shows us: The bytes of JavaScript by file. If sourcemaps are enabled, the bytes of JavaScript by module. Bytes of JavaScript used versus unused (execution) for page load.

What browser does lighthouse use?

Lighthouse is an automated website auditing tool that helps developers with opportunities and diagnostics to improve the user experience of their sites. It’s available in Chrome DevTools, npm (as a Node module and a CLI), or as a browser extension (in Chrome and Firefox). It powers many Google services, including web.

What is the latest version of lighthouse?

Lighthouse 9.0 is available immediately on the command line, in Chrome Canary, and in PageSpeed Insights. It will land in Chrome stable in Chrome 98.

How do I check the speed of my Google Chrome?

Chrome -> Right Click -> Inspect Element -> Network Tab. When you load a page there is a nice report for the timeline of the page showing the actual page load time, css, js etc. load times.

What is a good speed for internet?

The FCC says the best ISPs for two or more connected devices and moderate to heavy internet use should offer at least 12 megabits per second (Mbps) of download speed. For four or more devices, 25 Mbps is recommended.

How do I debug a network in Chrome?

To access this feature in Chrome, simply open the developer tools (command-option-I or command-option-J on a Mac) and select the Network option from the drop-down menu at the top. One last important thing to note: Chrome will only show Network requests that happen while the Network panel is open.

What is waterfall in network tab?

The Waterfall gives you insight into the sorts of things the browser is doing as it runs your site or app.

How do I know my request size?

1 Answer

  1. go to the network tab and right click the first item and click copy as cURL (this is how you will get the header size.
  2. Then go to terminal and do your curl command curl … -w ‘%{size_request} %{size_upload}’ which will print out the request size at the end.

What is initiator in network tab?

Initiator: The object or process that initiated the request. It can have one of the following values: Parser – Chrome’s HTML parser initiated the request. Redirect – A HTTP redirect initiated the request. Script – A script initiated the request.

What is stalled in Chrome?

(If you forget, Chrome has an “Explanation” link in the hover tooltip and under the “Timing” panel.) Basically, the primary reason you will see this is because Chrome will only download 6 files per-server at a time and other requests will be stalled until a connection slot becomes available.