Run a profile on your template, I have never seen the combined tick events take over 2.5ms (that is for ALL objects, not just the character) and that was in debug mode on a weaker computer, the tick events for the vr character are just some motion tracking and state handling, nothing that should cause a ton of work. Also it would be worth noting that due to reprojection being on, FPS is always either 45 or 90, event if it a stable 88 it will half frames to 45.
As for nativization, it works for me in 4.20, I don’t know what else to tell you, if you are running inclusive with no changes it should function. If you are running exclusive you need to make sure that you also nativize BPs that it depends on.