Great news. This guy is doing fantastic work. I'm on Gnome 3 these days but improvements like this are always welcome and keeps me doing desktop jumps :-)
Good for Martin for properly digging into this. It seems that actually rendering at 60fps is going out of style, at least partly based on the ignorant notion that because films are acceptable at 24fps, anything higher in any context must be overkill. It's good to see someone having it as a goal, especially for a (mostly) 2D app where the difference is more likely to be noticeable.