Book Image

Hands-On JavaScript High Performance

By : Justin Scherer
1 (1)
Book Image

Hands-On JavaScript High Performance

1 (1)
By: Justin Scherer

Overview of this book

High-performance web development is all about cutting through the complexities in different layers of a web app and building services and APIs that improve the speed and performance of your apps on the browser. With emerging web technologies, building scalable websites and sustainable web apps is smoother than ever. This book starts by taking you through the web frontend, popular web development practices, and the latest version of ES and JavaScript. You'll work with Node.js and learn how to build web apps without a framework. The book consists of three hands-on examples that help you understand JavaScript applications at both the server-side and the client-side using Node.js and Svelte.js. Each chapter covers modern techniques such as DOM manipulation and V8 engine optimization to strengthen your understanding of the web. Finally, you’ll delve into advanced topics such as CI/CD and how you can harness their capabilities to speed up your web development dramatically. By the end of this web development book, you'll have understood how the JavaScript landscape has evolved, not just for the frontend but also for the backend, and be ready to use new tools and techniques to solve common web problems.
Table of Contents (15 chapters)

Chrome – an in-depth look at the Rendering tab

The last section that we will look at in the developer tools is going to be the rendering section. This is usually not a default tab that is available. In the toolbar, you will notice a three-dot button next to the Close button. Click that, go to More tools, and click the Rendering option.

There should now be a tabbed item next to the Console tab that looks like the following:

This tab can showcase a few items that we will be interested in when we are developing applications:

  • First, when developing an application that is going to have a lot of data or a lot of eventing, it is suggested having the FPS meter turned on. This will not only let us know if our GPU is being utilized, but it will also show us if we are dropping frames due to constant repainting.
  • Second, if we are developing an application that has a lot of scrolling...