This problem was corrected with the RB6.0.1 release.
RB6.0.0 DDJ1000 Pitch Fader Player 1 is lagging and not responding quickly
When using DDJ1000 with RB6.0.0 Creative (Latest Catalina on Macbook Pro 2019 Max config) I've noticed that the pitch fader of Player 1 doesn't respond quickly or lagging (player 2 seems to work). Beat sync is of course disengaged. I've tried exactly the same configuration (same tune playing etc) with RB5 and no problem, what so ever.