i ran 60 fps last night solid no lag spikes no frames loss and it was amazing since the game launched i have yet to have a real issue
i7-2700k
win7
asus radeon hd7900 top for my card
liquid cooler on the cpu
and i have zero extra software running no antivirus ect
and i have very fast broadband
i have heard that some people think the pinging and lag can come if you have low download bandwidth but a good pc