I have built a pixhawk tricopter and just can't seem to get a delay bug worked out.
When I calibrate ESCs, throttle input is immediate.
When I arm the tricopter and fly, throttle input has nearly a 1 second delay
Also, my yaw servo is soooo slow. Often yaw is overshot due to both a control delay and the servo being slow- and of course autotune would have tuned it out if the yaw servo wasn't working at a tenth of it's rated speed.