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I've started on some input improvements for SW. The changes to the main game loop do make an noticable improvement to input performance.
I have more changes planned to bring things up to Duke 3D levels but submitting this now as the current crisis is starting to impact my ability to spend time on this.
Lastly, a slight tweak to my previous PR for Duke3D and RR.
Eliminating the if statement with the nested do/while loop by just using a while loop achieves the same result and simplifies the code by removing a near duplicate check.
The contents of the if statement always need calling at least once, so it might as well be called at least once in a while loop.