Hm! Timely reminder, as I'd been meaning to see what Gimp was like now, and I did make sure to include X11 in my recent Tiger installation. Do you mean it's "snappier", or that processor-intensive operations complete more quickly? (Or, indeed, both)

67MB! Whoo. It's not quite up to the level of Potatoshop, but it's getting there. =:)