A couple of years ago, I noticed a slowdown in my dial-up account and did a ping test. Bottleneck was in the Bay Area. Since using DSL, however, have not had execution/lag issue that I can discern. My trading style is not scalping or playing the spread, so even a delay of a second or two would be a virtual non-issue for me. Having said that, I have traded on both coasts and in Hawaii, and my current situation has been the most reliable by far. Whether it is a few milliseconds slower is way down on my trading priority list.