I have two coputers, one moderate performance on wireless, and the other a monster HP workstation with a graphics card that you list ad a very high performer, and this one is hard-wired to the net. BUT, the low level computer runs SL acceptably, while the powerhouse is so slow it is useless. My connection on that computer is 44ms ping, 20,000kbs download, and 1000kb/s upload. Nvidia GeForce 470 card, 8 core cpu, 8 gigs ram. I am out of ideas, because your lag meter tells me my ping is over 600, while it is actaully aboutt 44.