There are really a lot of "non-tied to processor" Windows games, Eagle of Fire. Especially in Win95-98 era (so from 1995 to 2000). They are become unpredicable on fast machines and unplayable too.
I used CPU Killer at some time, as I remember, on my Win98 and early WinXP. It worked for me just fine. But then on WinXP I discovered Microsoft Virtual PC, and it mostly eliminated speed issues in most of games when I tried (maybe it was too slow, or maybe there is "fix processor timing" somewhere, I dunno, as I didn't research it). Unfortunately, it was quite long ago - about 5-6 years now - so I cannot say how good it can work nowadays.
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