Paint is a process where colors, images, text, and shadows are drawn. Finally, we have the Painting part that has 2 parts- Paint and Composite. The Layout process tries to come up with the sizing of your elements and where to put them on the screen. Style calculations is a process where the browser is figuring out which CSS rule applies to which HTML element. Then, the Rendering part comes in with Style and Layout coming into place. This is the JS part of your code that will result in some visual changes on your website. Use the Inspect option by right-clicking somewhere on your page and selecting InspectĮverything begins with evaluating the JavaScript code on your page, which is what the Scripting part of Timeline refers to.The easiest way to do this is to open DevTools. What Chrome offers you for profiling is Performance profiling inside the Performance tab and Lighthouse inside the Audits tab in the Google Chrome DevTools (let's just call them DevTools from now on). Mozilla Firefox also has its own set of tools for measuring performance, and you can find other resources and websites online that do the same, but today, we'll focus on Google Chrome. In this blog post, we will describe how to do this with the Google Chrome browser. To understand why it is slow, you have to measure what is slowing it down and how it is slowing it down. Let's say your page is slow and you want to optimize it. Luckily, Google Chrome DevTools has a couple of tools that can help you. But, when your application slows down, you'll need to start looking into those deep corners of your codebase. They are the dusty parts of your application and could easily break (especially if you didn't write automated tests). The thing about legacy code and old features is that very few people in your team want to deal with them. Also, piled up features and legacy code can prove problematic after some time if they are not taken care of along the way. This is fine since you cannot predict every possible outcome of the code you added. But, as time goes on and more code and logic is added to the frontend, you might start experiencing some slowdown. In moments like these, you don't need to worry about measuring performance and profiling. When you get a greenfield project and you start building frontend from scratch, chances are that your website won't have poor performance. This post will help you sort these issues out. Your users might be experiencing sluggish UI and long load times. However, for some reason, the load time of your pages is still unreasonably high. Imagine that you optimized your backend and everything is running smoothly. Lighthouse-an open-source tool for improving the quality of web pages.The Performance tab in Google Chrome DevTools.We'll go through the two most used tools in Google Chrome for profiling: This blog post will explain how to effectively profile your website so that you can deal with performance pain points.
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