OBS CPU stat indication really isn't all that meaningful. It is overall system usage that is relevant.
Apple's M1/M2 (and soon M3?) chips are NOT performance CPUs. They are low-(electrical) power, battery life optimized systems capable of doing some very specific things very well (performant). But the CPUs are very easy to overwhelm once you get outside the 'walled garden'
So... OBS Studio can work, but you have to be careful. it is easy to follow some YouTube moron's advise, given without context, and completely mess up your installation.
And, you can NOT be a typical MacOS user and ignoring everything you have running in the background.
There are LOTS of threads/discussions on optimizing a computer for under-powered operations.
For you - you need to do general Operating System performance optimizations, and avoidance of unnecessary background tasks
Then, you need to make sure your OBS Studio settings are appropriate for a M1, thermally thottled, laptop. Speaking of which, you need to learn how to detect thermal throttling (make/model specific).
Until you have your system running well, best to avoid OBS' Studio Mode as that = 2X rendering workload.