I can report significant usability improvement on a single core ThinkPad T42 and a dual core ThinkPad X60.
It's not just "the videos in Firefox" - everything works *so* much more fluently with the patch there's no way I would go back living without it. I know a hack is a hack and I know there are many unknowns there, but at least from the perspective of a "normal" OpenBSD desktop user, this patch is an absolute must. Let's not start a flame war here, just throwing in my five cents. Kudos to Martin. -j.