I'm not getting the lag myself, seen some videos where others aren't either so it may be a pc thing going on over on your end? I will look into optimization in future builds but as of V.1.0.3 the game has full stage occlusion culling set up. It does have a lot of listener objects due to the interaction, that may be what's slowing you down. I'll see what I can come up with in future releases. Thanks for checking it out!