Comment 25 for bug 1386721

Can confirm that upgrading to 3.14 according to the instructions written here has seemingly fixed the issue for me:

http://www.webupd8.org/2014/10/how-to-install-gnome-314-in-ubuntu.html

Everything seems very responsive right now, vlc, rhythmbox, chrome, firefox, gedit and terminal.

Cannot say however what other consequences this may have had..