Don't evaluate the ActorScroller transform function every time though Draw.

Cache TweenState values at a provided interval, then interpolate between the TweenStates.
TODO: Precalculate these TweenStates in Init?

stepmania/src/ScreenNameEntryTraditional.cpp

@@ -120,6 +120,7 @@ void HighScoreWheel::Load( const HighScoreList& hsl, int iIndexToFocus )
 		10.5,
 		false,
 		sTransformFunction,
+		1,
 		false,
 		false );
 	Scroll();