Sik Radio slowing down other devices

Hi.

I am running real sense obstacle avoidance on Rover. When I connect Pixhawk to my PC with USB I get a stable 15Hz signal on obstacle_distance in mavlink inspector. When I connect with a Sik radio, the obstacle_distance signal drops to 6Hz and fluctuates up and down. The proximity window is lagging and obstacles disappear. Is there something I can do to fix this?