I'd like two additional options in Preferences > 2D > Grid Brush. "Max Filled Box Preview Size" [integer] "Max Filled Box Erase Preview Size" [integer] Large, complex rules can get laggy. I'd like to be able to show only so much area before the preview turns off to avoid lag. For example, I'd probably pick values of 100 for filling (10x10), and for erasing 25 (5x5) for erasing. Beyond those sizes I don't care to see the preview.