Game inexplicably goes into slow motion

Hey this is happening once i updated, i even completely uninstalled then reinstalled whereby the game then updated itself, and i encounter the exact same problem

When the world initially loads the game is running normally, but then quickly drops into slow motion, something like 75% of realtime

ALT+Up arrow has no effect

If i go into world editor and click physics speed to 100% it temporarily goes back to normal but then it drops back slower again.

 

Computer specs?

 

very strange, however i rebooted and now it's running fine, mind you the previous run was from a clean boot also, (except for the update running). thanks anyway guys! I love the game, keep up the great work Thomas!