You know, my wife has similar problems in Safari and Firefox--it seems to be symptomatic of a poor net connection, in our case a problematic wireless router which I replaced last night.
Sometimes when I check the system.log, I see messages like
Code:
Oct 29 21:18:30 Lens-MacBook mDNSResponder: Repeated transitions for interface en1
(FE80:0000:0000:0000:0216:CBFF:FEB9:0820); delaying packets by 5 seconds
Could something similar be happening to you?