Hi,
at the moment the gyro movement depends on how often the browser is firing the 'deviceorientation' event. On iOS it seems to fire with a ~30hz rate, while the rendering framerate itself is 60hz, so the movement it slightly not as smooth as it could be...
I'm already planing a new gyro plugin with frame-interpolation and/or movement-prediction to get a smoother and browser independent gyro movement, but this might sill take a while.
Best regards,
Klaus