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This should fix your slowdown/speedup issues!

I find that if I type "setmaxfps 60" in console (without quotes) that it works flawlessly.

http://pkzone.org/downloads/mods/pk-1-3-open-beta/

**EDIT**

the EXE itself is 32 bit, but it's made to work with dual cores. sorry for the confusion.
Post edited March 20, 2014 by cool2000m