Pixhawk 2.1 black cube fast GPIO?

Hardware Vendors CubePilot/ProfiCNC/HEX
1

Hi,

just wanted to know if AUX4 (CAM_FEEDBACK_PIN=53 ) is still the fastest of the GPIO ports ?
Does it work for camera feedback via hot shoe or is it still better to use a standard GPIO (i.e. AUX1) ?

2

How did you go with this?