Run multiple tests at the same time - Selenium Python Unittest

I'm currently working on automated tests for an web application, and I decided to work with unittest & selenium in python.

However, after some time writing tests, the execution of my tests is now massively long (about 15-20 minutes) each time. So I would like to execute each test independently at the same time.

How can i do that ? I've heard of Selenium Grid, but would like to use something else maybe.