So I had a Captivate and now I have another Captivate. My original one was having the known lag issues and the GPS wasn't working even after the update. So AT&T sent me new one. So the GPS works great now, but the lag also seemed to disappear. I have no way of explaining why I'm not experiencing any lag on this one like I did with the last one, which I'm very happy about. But I was just curious as to why this would happen and wondering if anyone knows? Edit. Well the only thing I have done differently on the new one is that I have no music files on there yet. I'm actually going to put all my music on a separate SD card, but haven't done it yet. So would not having any files on the phone help it not lag?