Try *not* running Pero and Flower Knight at the same time, those two slow down eachother a lot I noticed. So when I'm in Pero and want to play Flower Knight, I press the "games" button at the top, which opens a new tab, then close Pero, and then click the link to Flower Knight Girl. And same thing the other way round. I always close the tab for the previous game before entering the next. It reduced lag a lot, and also reduced the Flash crashes I used to have.