I used to run a daily show off a tricked out MacBook Pro, and it was really problematic (e.g. 30 second delays on live streams). Moved to PC with a good processor and video card, and now it just sips the processor at ~12% with near-live performance. If you use OBS for live streaming, I strongly recommend you move off of Mac, especially if you do anything beyond the most basic operations.

There is a lot that you can do to optimize OBS streams before you may need to jump to Windows, however :)