Mission planner refresh rate

Is there a way to reduce the lag in the HUD and the mission planner software in general?

When I connect to the copter via the rfd900 radio links, the hud doesn’t move like in real life…

You can increase the RFD900 baud rate:
Baud 115
Air Speed 200
Max Window 80

You dont need Op Resend, and ECC will take a lot of usable bandwidth if you need it for some reason.