You should still check your framerate just to be sure, it’s easy enough to do and you should have it on a lot while developing anyway (type statFPS into the console or set it up in blueprints for event begin play > execute console command ‘statfps’). The only time I get judder in UE4 is if my framerate isn’t hitting 75 with VSync On. There could be other reasons yes, but is always the first thing to rule out when trouble shooting in the rift. Also make sure you have timewarp on, put HMDmirror OFF etc after that then you can really start trouble shooting.