Gyson, MBrown... true.
This isn't a permanent thing in any way. You run cheatengine in the background. Doesn't matter if you start it before or after starting D:OS. Then simply click the (EOCAPP.EXE) process, check the box, apply. You can also just hand type the speed in the field below the checkbox.
I'll see if I can find a spyware free version and share the link, mine is from years back without any extra poop.
