Improving performance in a React application involves various strategies, ranging from optimizing components and rendering to code splitting and leveraging browser features. Here are some tips to help you increase React performance:

1. Use React DevTools Profiler:

React DevTools includes a Profiler tab that helps you identify performance bottlenecks in your components. Profile your application and analyze which components are taking the most time to render. 

2. Memoization with React.memo:

Use React.memo to memoize functional components and prevent unnecessary re-renders. This is especially useful when your components receive the same props and state frequently.

3. Use PureComponent or shouldComponentUpdate:

For class components, consider using PureComponent or implementing the shouldComponentUpdate method to prevent unnecessary renders. These approaches help in shallow comparisons of props and state.

4. Optimize Render Methods:

Avoid unnecessary calculations or operations within your render methods. Move complex computations outside the render method or use memoization techniques. 

5. Code Splitting:

Implement code splitting to load only the necessary parts of your application when they are needed. This can significantly reduce the initial load time and improve perceived performance.

6. Optimize Images and Assets:

Compress and optimize images and other assets to reduce their size. Consider lazy-loading images that are not immediately visible on the screen.

7. Bundle Splitting:

Use tools like Webpack to split your bundle into smaller chunks. This allows the browser to load only the necessary code for a particular view, reducing the initial load time.

8. Virtualization:

Implement virtualization techniques for large lists or grids. Libraries like react-virtualized or react-window can help render only the visible items, reducing the DOM elements and improving performance.