Name a few techniques to optimize React app performance.

There are many ways through which one can optimize the performance of a React app, let’s have a look at some of them:

• Using useMemo( ) –
  • It is a React hook that is used for caching CPU-Expensive functions.
  • Sometimes in a React app, a CPU-Expensive function gets called repeatedly due to re-renders of a component, which can lead to slow rendering.
    useMemo( ) hook can be used to cache such functions. By using useMemo( ), the CPU-Expensive function gets called only when it is needed.
• Using React.PureComponent –
  • It is a base component class that checks the state and props of a component to know whether the component should be updated.
  • Instead of using the simple React.Component, we can use React.PureComponent to reduce the re-renders of a component unnecessarily.
• Maintaining State Colocation –
  • This is a process of moving the state as close to where you need it as possible.
  • Sometimes in React app, we have a lot of unnecessary states inside the parent component which makes the code less readable and harder to maintain. Not to forget, having many states inside a single component leads to unnecessary re-renders for the component.
  • It is better to shift states which are less valuable to the parent component, to a separate component.
• Lazy Loading –
  •  It is a technique used to reduce the load time of a React app. Lazy loading helps reduce the risk of web app performances to a minimum.