Why FastAPI is fast?

FastAPI is fast! , it is much faster than the flask because it’s built over ASGI (Asynchronous Server Gateway Interface) instead of WSGI (Web Server Gateway Interface) s the flask is built on .

FastAPI is fast! , it is much faster than the flask because it’s built over ASGI (Asynchronous Server Gateway Interface) instead of WSGI (Web Server Gateway Interface) s the flask is built on .

Performance: Since the FastAPI has its main focus on high performance we can say it is the fastest framework among all of them , Flask is also a high-performance API because of its micro-framework feature and gives higher performance than Django.

Performance: Since the FastAPI has its main focus on high performance we can say it is the fastest framework among all of them , Flask is also a high-performance API because of its micro-framework feature and gives higher performance than Django.

Although Flask has a built-in web server, as we all know, it’s not suitable for production and needs to be put behind a real web server able to communicate with Flask through a WSGI protocol. … In case we need to scale up our application to multiple servers, Nginx will take care of load balancing as well.

When Flask app runs slow we need to identify what is the bottleneck. It can be an overloaded database, unresponsive external API, or heavy, CPU-intensive computation . This is the whole recipe on how to speed up Flask – find the source of sluggish performance.7 May 2020

If you want to get better performance consider serving your Flask app via gunicorn, nginx and the likes . Flask also has an option where you can enable multi threading.