animateRate:

  80 means 12.5 Hz or FPS; how smooth we animate in milliseconds.

  Lower number means higher FPS.

  animationFractionPerSecond:

  3 means go 300% toward goal in 1 sec.

  Lower number means more animation drift as it goes to the target view.

  minTranslateSpeedPixelsPerSecond:

  Higher number means move faster (more "snappy") to cursor position.

  The final translation value is this multiplied by the above animationFractionPerSecond.

  setMinZoomSpeedPerSecond:

  Lower number means zooming with more steps and is smoother.

  If you reduce the animateRate, it is recommended to also reduce this value.