the drag can come from two places: the cassette or the motor's bearings.Yeah I understand why you'd think it could be the weight of the bike but It isn't that. The crossfuse and crossfire weight about the same and I can cycle the crossfuse without the motor with ease.
The hub was 100% dragging! Even the staff said the hubs drag as it was the design. I'm having no issues with my new bike
put the bike on a stand, spin the cranks and wait for the wheel to stop. If the cogs on the cassette/chain move then the drag comes from the cassette. If not then the drag comes from the internal clutch unit or the motor's bearings.