How Do Web Workers in ReactJS Transform App Performance?

Evelyn Taylor
5 min readSep 26, 2023
Photo by orva studio on Unsplash

Have you ever had a situation where some code you’re running makes your app or website freeze for a bit, causing it to become unresponsive?

If that’s the case, you definitely want a way to make that code run in the background so it doesn’t disrupt the user experience.

In React, there’s a simple trick for dealing with these kinds of heavy-duty tasks in the background, and it involves using something called a “web worker.”

But what on earth is a web worker, you ask?

A web worker is like a digital assistant for your web browser. It’s a separate, background script that can run alongside your main web page or app without causing it to freeze or slow down.

Web workers are great for handling tasks that require a lot of processing power, like complex calculations or data crunching. They help keep your user interface smooth and responsive by doing the heavy lifting in the background.

Think of them as your website’s backstage crew, working behind the scenes to make things run smoothly on the front stage.

Here are some common use cases for web workers:

  1. CPU-Intensive Calculations: When your application needs to perform complex calculations, such as mathematical simulations, data…

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Evelyn Taylor

A front-end enthusiast and dedicated development engineer, eager to expand knowledge on development techniques and collaborate with others.