None of that comes into play in MS-DOS, which never supported multiple processors. CPU 0 on Alder Lake is also a P-core, so you're not going to be throttled by

None of that comes into play in MS-DOS, which never supported multiple processors. CPU 0 on Alder Lake is also a P-core, so you're not going to be throttled by MS-DOS not knowing how to thread-schedule itself. I'm also not certain but would not be surprised if power saving isn't implemented or functional in any of the firmware-provided compatibility SMMs that are running when you boot into such an old OS.