Why? It's always below 100%, isn't it?
Problems only come when you exceed 100%, even just momentarily. So for highly variable loads, like typical PC usage, consistently over 30% or so starts to raise eyebrows. But for constant loads, like video rendering and encoding, 90% is perfectly fine.
Besides, processor usage is not some arbitrary number that can be manipulated at will. It's a direct measure of how much work the processor is actually doing. Bloatware does count towards that, but the vast majority of OBS's workload is already the data itself that it needs to process, using a standard well-tested algorithm. Aside from some very clever optimization, that load pretty much is what it is. Either get a processor that can do the work, or don't do the work.
