How metric scores are determined #. Why should you play solitaire game by Francine Prose ? Fully interactive after ~1s with 65,7 KB on the first load and a 100% lighthouse score. Pwa ranking according to the lighthouse score. This can create a frustrating user experience. Lighthouse tests for 11 out of the 14 requirements automatically, with the other 3 being manual checks. The Lighthouse Viewer needs the JSON output of a Lighthouse report. See Measure Performance with the RAIL Method for more information. I am disapointed by the rank Google gives to it because I applied all the requirements ( pwa, offline and online, fast ...) and it is far from being on the first page when one search for solitaire game. This means that it’s optimized for static sites and totally ignores the benefits of a PWA (which has faster transitions between sites and has more interactivity). Run a Chrome Lighthouse Test. The remaining 3 can only be tested manually. The https://github.com/lwsjs/local-web-server/wiki. And while checking for performance on lighthouse I've noticed a couple of discrepancies and would like someone to explain those to me. Once Lighthouse is done gathering the performance metrics (mostly reported in milliseconds), it converts each raw metric value into a metric score from 0 to 100 by looking where the metric value falls on its Lighthouse scoring distribution. The metrics scores and the perf score are colored according to these ranges: To provide a good user experience, sites should strive to have a good score (90-100). to find bugs that you can fix, or audits that you can create or improve upon. All the above contents are taken from Google Developer Docs provided under Creative Commons Attribution 4.0 License. You can run it against Apache 2.0 License. See Using programmatically for an example of running Lighthouse For details, see the Google Developers Site Policies. Lighthouse PWA Analysis Tool. You can use the materials linked to from this page, but some of the content may be out of date. a log-normal distribution derived from the performance metrics of real website performance See, Minimize the number of required or "critical" resources that must be downloaded or executed before the page can load. The 25th percentile of HTTPArchive data becomes a score of 50 (the median control point), and the 8th percentile becomes a score of 90 (the good/green control point). Lighthouse has automated audits for 11 of the 14 requirements. While you certainly can expect overall changes in your perf score from 5 to 6, any scores for desktop will be significantly different. The lower the score, the better. Lighthouse returns a Best Practices score between 0 and 100. 0 is the worst possible score, and 100 is the best. Minimize the number of render-blocking external stylesheets and scripts upon which the page depends. Lighthouse is the the tool present in google chrome to audit web apps. It has audits for performance, Run Lighthouse on an emulated mobile device on a 3G network. well as how to fix it. The mobile score is almost always worse than the desktop score. Lighthouse maps each raw score to a number between 0 and 100. into the Gist. Click Run audit. currently-focused page, then opens up a new tab with a report of the To improve your TTI score, defer or remove unnecessary JavaScript work that occurs during page load. SEO refers to the improvement of unpaid results (known as "natural" or "organic" results), and excludes direct traffic/visitors and the purchase of paid placement. We want as many people as possible to use Lighthouse, and this Guidelines and Brand Assets for Integrating Lighthouse is meant to make it straightforward for you to show that Lighthouse is under the hood while protecting our brand. A score of 100 for PWA is great! The issues tracker is also a good place to discuss audit metrics, ideas for Make sure you are testing the correct URL and that the server is properly responding to all requests. The weightings have changed over time because the Lighthouse team is regularly The Performance score is a weighted average of the metric scores. The PWA audits are based on the Baseline PWA Checklist, which lists 14 requirements. Optimizing the Critical Rendering Path is particularly helpful towards achieving a faster First Meaningful Paint. We're still working on updating written materials, but check out our new codelabs and videos. I would say this is a very good start for your next project. If not, open Chrome's main menu and Page load is a key aspect of how a user perceives the performance of your page. to understand why. First of all I’ve created a simple angular application (including the new ivy rendering engine, because I can): Now we need to prepare some small additions to our application code. Creative Commons Attribution 4.0 License, Le jeu de solitaire a inspiré un des outils mathématique le plus utilisé au monde. The Gist filename containing the JSON output must end in The metric value for LCP represents the time duration between :-). contribute to your Lighthouse Performance score, not the results of Opportunities or Diagnostics. (Details: net::ERR_CONNECTION_REFUSED). Click Perform an audit. Lighthouse's documentation on Variability, Testing on different devices, such as a high-performance desktop and a low-performance laptop, Browser extensions that inject JavaScript and add/modify network requests. Now fire up your browser of choice (still chrome for me :) and open and see the our app. access it at the top of the menu. The lighthouse score is shown below and the hard work clearly pays off.

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