I am pasting some of what I said from another forum…
I know everyone’s situation is different, but with the OsTirus, as a quick test, I loaded up 8 instances of it (so 16 DSPs total), each running the same random patch using 8 voices. I’m on a Ryzen 9 5900x and saw about 50% usage across all 12 physical cores. Yes, not scientific at all and does nothing really but prove that it works in my use case, but I found it encouraging overall.
I played long, sustained chords during that test without any dropouts or glitches. To be fair, I don’t run low-latency buffers; I’m generally running 256 at 48K / 24bit. So far, for me, it’s been surprisingly stable.
It’s only an observation, but it seems like Mac users report more stability and CPU issues. I don’t know if that’s down to CPU architecture or optimization, or simply that there are more Mac users than PC users, and that’s skewing results.