world.cpu isn't correct.
Numbered Steps to Reproduce Problem:
Included source
Expected Results:
When not moving world.cpu should set to 0 since nothing is happening.
Actual Results:
world.cpu sets to

Does the problem occur:
Every time? Or how often? yes
Did the problem NOT occur in any earlier versions? If so, what was the last version that worked?
stable doesn't cause the issue.
You can download the source and see it happen yourself after moving and stopping.
http://www.byond.com/developer/Kozuma3/Raycasting3DMaze