Processing multiple transactions very fast
I want to send one transaction with 5 BTC to one address and a transaction with 2 BTC to another.


The fastest (and cheapest) way to do this is with a single transaction.

Many transactions have 2 outputs, one being for change, but it doesn't need to be for change, and doesn't need to be limited to 1 or 2 outputs either.

Take this transaction for example, it has about 2 dozen outputs: https://blockchain.info/tx/df9ba42c44d25df13d3bdba0994b98b97d8c22293daf0c27e8e5d9b4e21c5906

 

Total fee, just 0.00483272 BTC