The game feels really jerky even when running at ~40 fps for me, so much so that I thought I was mostly in the range of ~20fps most of the time after I run an initial test and I saw it flunctuates between those two ranges then turned the fps display off. But upon turning it on again now that I've finished the game I see that often in many areas it's mostly at ~40fps, not ~20 (which happens too but only in certain areas and sections) yet as I said feels really choppy. Is there an explanation for this, I mean, I play on multiple platforms so often play ~30fps games too but it rarely feels as bad as this game feels at ~40, I only have as bad a feel in games my PC can't handle at all for real, like The Witcher 2 and BF3. I've turned off the frames rendered ahead thing since it made it look like I'm getting lag in a single player game in firefights so it's not that. The game only really felt smooth when around 60fps which of course happens rarely on my PC. Also when I choose to play widescreen letterboxed from the in game options (my current monitor is 4:3, 16:10 broke down) the sniper rifle scopes are invisible (maybe just the most expensive scope, I didn't test the others, but the scopes - not sights - for the assault rifles and stuff didn't have the problem). It's fine with normal widescreen.