Table of contents
Problem
In MacOS, when connected to an external non-Apple mouse the scrolling seems to be jittery and laggy, instead of the smooth scrolling experience the macbook trackpad or Apple Mouse provides
Solution
Download a utility called Mos from here.
Install it and add it to start at login.
Open the app and turn on smooth scrolling.
Conclusion
It's done, you can now scroll smoothly on MacOS with external mouse.