What is the "fastest" wallet or service out there. Think of those ICOs that are sold in seconds... how to be the first?
Your question is quite confusing. I don't know if there's an existing "fastest" wallet, most of the wallets are very reactive, convenient and fast when it comes to their service. But the problem goes to the network of each coin that you do transactions.
Bitcoin network is slow and as well as ETH. And regarding on your question on how to be first, do you mean to ask on how to be the first one to join ICO?