you’re probably used to the sluggishness of a heavy bike, IGH, the clutches of the motor or the actual motor operation and so on.…
One thing I immediately noticed: as I pedaled, the bike "pulsed". This was inline with the strongest part of the pedal stroke particularly as I went uphill. It was a bit disconcerting as I hadn't felt that on my other bikes. I assume this has something to do with the fact that I can lift the thing with my pinky.
you can maximize smoothness by working on the roundness of your pedal strokes (don’t pull up hard, but think about pushing each foot through the full circle at top and bottom) and make sure both legs are contributing equally. also make sure you’re not in too low of a gear - low cadence out of the saddle gives me that pulse-y feeling too, whereas spinning faster doesn’t.
enjoy the bike!