Seems like a wash to me on a non-retina mac. It was fine before and seems fine now. Does anybody know if this should theoretically help non-retina mac users?
It won't hurt, but the article pointed out the main performance fail was coming from all the increased strain that retina displays were causing on memory and cache. Since retina displays have 4x as many pixels, Firefox was doing 4x as much work for its inefficient compositing engine doing large full-scene copies on every frame, and this was pushing the limits of what typical integrated graphics was able to smoothly pump through bandwidth-wise.
