This is pretty much the opposite advice that almost all h-game creators need to hear, but it might be a good idea to pause content updates for awhile and just focus on performance for a few months. This poor performance of the game has made it basically unplayable on the low end, incredibly annoying on mid-range, and is even starting to become distracting on the highest end machines. The problem is only getting worse, and the rate we're going, in a couple of years I won't want to play it on anything.