May 2018
Beginner
304 pages
8h 21m
English
book
Learning React: A Hands-On Guide to Building Web Applications Using React and Redux, Second edition
by Kirupa Chinnathambi
Content preview from Learning React: A Hands-On Guide to Building Web Applications Using React and Redux, Second edition
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17
Avoiding Unnecessary Renders in React
You’re probably really tired of me saying this, but fast DOM performance is one of the biggest feathers in React’s cap. That doesn’t mean you get all that great performance for free, though. While React handles a lot of the heavy lifting, you should consciously take certain steps to ensure that your app isn’t doing unnecessary work and slowing things down. One of the biggest steps involves making sure each component’s render method is called only when it absolutely has to be. In the next few sections, we’ll look at why that’s a problem and what you can do about it.
About the render Method
The render method’s official job description is pretty simple. It just needs to show up on each component and help ...
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