100% CPU use

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sequoia

I just recently noticed that the main game loop that displays the graphics and makes updates, cranks the CPU
use up to 100% which is logical, but I don't want it to run
at 100%. I lowered the speed of the loop by using something like:
a=createtimer(27)
while not keyhit(1)
waittimer (a)
wend

This works, but I still somehow get about 60%-80% CPU usage
but don't want to slow it down further because I don't want the FPS to drop below 27.

Any idea if it is possible to reduce CPU usage any further
without slowing the FPS or loop speed down with it?

thanks