No, it's not matter with SL or without. I have 9999 ping in SL (with beta too), then most of servers freezes and the game has stopped responding. When I launch it without, pings are normal but the same problem, game stopped responding. With my old table PC next to me, I have not such issues. It's interesting that not only I have this problem on MSI GT70 but I don't know what the factor.