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There are several ways to improve the performance of Flask API:

1. Use a web server: While Flask comes with a built-in development server, it is not suitable for production use. Instead, use a full-featured web server like Apache or Nginx to serve your Flask app.

2. Cache data: Caching can significantly improve the performance of a Flask API. By caching static or frequently accessed data, the API can quickly return data without the need to recalculate everything from scratch.

3. Optimize database queries: Properly optimizing database queries can reduce the time spent on database server requests and improve the overall performance of the API.

4. Use a load balancer: If your Flask API receives a high volume of traffic, it is recommended to use a load balancer to distribute requests across multiple servers. This can help prevent server overload and improve performance.

5. Set specific resource limits: It is good practice to set limits on resource usage (such as memory and CPU) to ensure the Flask API does not consume all available resources and slow down the entire system.

6. Implement asynchronous processing: Asynchronous processing allows the Flask API to handle multiple requests simultaneously, improving the overall performance and responsiveness of the application.

7. Use a Content Distribution Network (CDN): If your Flask API includes static files (images, videos, etc.), a CDN can help improve performance by caching these files on servers closer to the user.