Our company is using 2 Zyxel PLA407 powerline adapters. We currently have one router downstairs that's connected to one adapter. The other is located upstairs (currently 30 feet away connected to a desktop). We've recently noticed that the speed is much faster when you just plugin, rather than going through the encryption process.
So my question is: Should we set up the encryption on a closed loop system? Or is it already secure?