optimization

stepmania/src/NoteDataUtil.cpp

@@ -171,6 +171,10 @@ void NoteDataUtil::LoadFromSMNoteDataString( NoteData &out, CString sSMNoteData
 					}
 				}
 
+				/* Optimization: if we pass TAP_EMPTY, NoteData will do a search
+				 * to remove anything in this position.  We know that there's nothing
+				 * there, so avoid the search. */
+				if( tn.type != TapNote::empty )
 					out.SetTapNote( iTrack, iIndex, tn );
 
 				iTrack++;