very rarely, My "view" will "spam" (if I looked up slightly, I'll WHIP UP all the way maybe even most of the way towards a direction other than up for the slightest unnoticeable shifting towards that direction) but, I play on pretty much lowest settings apart from view distance being next tier up.
Aside from r9, I have a similar setup - 16gb ram, win7 64bit and FX8350 - so it could just be a matter of the game not really being super-optimized yet, foliage on pretty much any game being set "super high" just begs for issues to occur, Usually I just recommend people mess with that setting (I think it was actually called foliage, not going to check right now)