I also get this, for me whilst playing MP I get an FPS drop (screen freeze) every 3-4 seconds - this is with the latest Dev build (as of 28th May).

I read on the forums it may be related to excessive logging in the RPT file ???

Try lowering the MIXER levels via the Logitech Gaming Software to 10 or less to see if that removes the problem.

If you have a Logitech G35 open your mixer controls and set the value to 9 for each speaker to see if that sorts it.

If that works try setting the mixer to 10 all around and see if you get the problem then (some people say 10 fixes it, I found 9 worked best).

Try lowering the MIXER levels via the Logitech Gaming Software to 10 or less to see if that removes the problem.