That means that the battler's refresh function is being called a lot. That's the change in 1.4, to have the refresh function trigger stats update. I'll think up something
I did find that when I reduced the possible available weapons types, it performed a good bit better, in some cases it dropped to 30 fps from 60 on the basic attack where I have it do it twice, but it was brief and went smooth. But I used an ability with one of my characters and got this error. and it froze the game.