Background: I currently own a P3S and have been flying a LOT since September 2015. My current monitoring device is my Samsung G5, and I really like it. But I had issues with lag running Litchi, and I have a P4 on order. My Question: Since the P3S controller is different, and the GO interface offers more options on the higher models, does it require more processing power to monitor/control the P4/P3A/P3P vs. the simple P3S I currently have? Have any of you who upgraded from the P3S to the P4 found your existing devices inadequate? Thanks for any info you have on this.