So I've had RockSmith going on the trifecta of systems since the original RockSmith, that is on Xbox, PC, and on a Mac.     When RockSmith2014 hit the streets, it *felt* at the time (especially on the Xbox) that there was more latency in the game (especially processing time to produce sound, so string time to sound felt super laggy)- to remedy this I created this setup:   Guitar/Bass ---> Lehle Sunday Driver ---> Lehle P-Split ---> RockSmith Cable to PC/Xbox/Mac