Speed doesn't matter as much as latency for things like this. The main problem with high latency is you try cashout at 1.2x and the server doesn't recieve the message till say 1.4x. Normally this isn't a problem, and you'll make more than you intended (an extra ~17%) but about ~17% of the time, you'll end up crashing. So even though it basically works out the same, I highly recommend using the "Auto Cash Out @" feature exclusively, where latency no longer matters. =)