How to accelerate the Flask application?

I have an API on Python flask framework. Sometimes it takes too long time (up to minute) to achieve a result from the server. However, the calculations are not so heavy.

I use also PHP, which works much quicker. Is there a way to accelerate the flask server?

The server calculates the sgp4 algorithm:

The way I'm initializing the server:

 export FLASK_APP=lat_lon.py
 python3 -m flask run --host=0.0.0.0 --port 5002