I didn't even know Y existed.
Perhaps one of you, guys, can answer a question that lingers on my head every time I work with a heavy pdf file. I think I read somewhere that poppler uses cairo and that this uses HW acceleration when available (I don't actually know what that means, mind you). Why is it that displaying pdfs is rather slugish? Out of pure ignorance I'd say that drawing a 3D landscape like any of the ones you get playing a FPS is more cumbersome than displaying a bunch of fonts...
I'd attribute this one to the program itself. Evince was really slow on displaying the pdfs, but Adobe Reader (yeah it looks horrid with the custom cursor and fails to open a browser properly) just flies on them.