Enhancing Performance with React Native’s Inline Styles

Question:
I want to enhance component performance, but after analyzing multiple components, I discovered a significant amount of re-rendering occurring with each component. Is there a method to lessen component re-rendering in React?
In functional components, you can utilize memoization by wrapping the React functional component with React.memo(). Memoization serves as an optimization technique.


Question:

Android React Native App

I’m already applying things like

Removing console logs.

  1. <p>
    No
    <a class=”text-blue-600″ href=”https://in4any.com/how-to-write-a-visited-in-inline-css” title=”How to write a:visited in inline CSS?“>
    inline styles
    </a>
    .
    </p>

  2. Avoid neglecting the invocation of setState on a component that has been unmounted.

  3. Utilize <a class=”text-blue-600″ href=”https://in4any.com/react-native-flat-list-not-showing-up” title=”React.Native: Flat List not showing up“>
    Flat list
    </a> for data rendering purposes.

However, developing solely for Android is insufficient due to a significant performance disparity.


Solution:

Enhancing the performance of a react-native app involves numerous methods and procedures.

  1. When defining your component, it is recommended to use

    React.PureComponent

    (for class based components) instead of

    React.Component

    . This approach performs a shallow comparison of props and state, and only triggers a re-render if there are changes.

When utilizing
functional components
, enclose your component using

React.memo

, which performs a comparable function to

React.PureComponent

in
functional component
s. Apply the same technique to the component employed in

renderItem

of

Flatlist

.

  1. Instead of mutating data (props and state), it is recommended to create a copy and make the necessary edits. Further information can be found here.

  2. When importing from another file, ensure that you only import the necessary things rather than importing everything.

The only time using the wrong way is acceptable is if you require all the information or if it is a necessary condition for utilizing another API.

import * as everything from 'path/to/some/file'

right way;

import {firstthing, secondthing} from 'path/to/some/file'
  1. To enhance the response speed, it is advisable to decrease the number of items shown on the initial render, as mentioned in <code>
    Flatlist
    </code>, by utilizing the <code>
    initialNumToRender
    </code> prop.

  2. When utilizing animations, consider implementing the native driver for the animation view (if feasible) to ensure seamless animation execution without any interference from the JavaScript thread.

  3. Consider decreasing the usage of <a class=”text-blue-600″ href=”https://in4any.com/how-can-i-reduce-the-size-of-the-app-built-by-expo-react-native” title=”How can I reduce the size of the app built by expo/react-native“>
    size of the app
    </a> in your app. If there are any unused elements within your app, it is recommended to remove them.

If you are utilizing expo but your app does not heavily depend on expo APIs and other features, it is advisable to eject.

During the app’s creation, specifically at the setup stage before any coding was done, it becomes evident that the size of
expo app
reaches approximately 40-50 MB.

Additionally, there are numerous other aspects (although my knowledge is limited ). Extensive information on this topic can be found online.
“””.

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