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Since the very beginning I have adjusted my Rads but having read this thread decided to leave them fully open on a MP session for the entire session. I didn't notice any difference or penalty - not one that would be considered a disadvantage.

I am now unsure as to wether the Rads have any drag impact but having said that I will continue to control my rad settings as a matter of good habit just in case something changes regards this in a future patch.