Hi, 
In your local instance  currently the Odoo may be running as a single process, and single thread will be handling all the incoming requests.

To handle multiple request and multiple users at a time, we have to enable workers in Odoo

And to configure workers we use revers proxy like nginx and apache

Refer this video for details: https://youtu.be/-hVYQd7A7PQ

and https://youtu.be/dQtIKmNdVgA

Check this post also: https://www.odoo.com/forum/help-1/odoo-worker-number-calculation-for-multiprocessing-172597

Hope this will help you 

Thank you