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Joystick Command Delay

The commands that I give through joystick make delay. I tried two different joystick and all Ardusub firmwares. What can be the problem?

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Hi Sena
what about video feed? is it also shows some delay?
if not, The problem is with Your Raspberry Pi. When SoC temperature increases beyond 80 degree celsius, RPi will reduce its clock frequency from 1.2GHz. There happens this delay problem.
Kindly check Rpi’s temperature by using vcgencmd measure_temp in Rpi’s terminal, also use vcgencmd measure_clock arm command to check Rpi’s clock freuency.
we solved this issue by placing a cooling fan on Raspberry pi so that Rpi’s temperature never exceed a limit .

`Thank you