ACPI / Performance loss?

I am not having problems, but I do have a question.

Is there any Performance loss utilizing ACPI under Win2K? I want to make sure I am going to gain some performance, at least save on resources and memory utilization. Just making sure! before I go ahead with the re-install Win2K under HAL standard pc.
thx


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Never tried W2K without but I'm as satisfied as I can be until they develop us some hardware that will consistently give us real-time video with programs that launch faster than I can reach for my mouse....