It does greatly help for me as well as it lasted 5h.

But setting the option to glamor isn't so good for me because there were
display artifacts in some cases. For example I would open vinagre and the
header bar (where there is Remote / View / ... menus and the Connect /
Disconnect / ... buttons) wouldn't be drawn, I would see the content of what
was there on the screen before I open that window instead. Same with
gnome-control-center.

I just noticed a package update in my distrib today:
glamor-egl-0.5.1.r258-1-x86_64

I might give it another shot. I'll also update my kernel to 3.13 as I am on
3.12.7 at the moment.