Vertical Sync drops FPS

[SPACoD]

I was running in full screen and SSAO samples are only 16, note that I said when I was using SXGA resolution monitor I could put it on 128 with 45 FPS which is actually quite nice. I just played Battlefield 3 with everything on max settings and it didn't lag or stutter. Without VSync there was MAYBE some image tearing but if there even was I didn't notice it. I also tried putting VSync on in BF3 but still no lag whatsoever.
I don't understand how it isn't an issue with the game because it only happens when an object is very close to the player's camera, not any other way. It might be an OpenGL issue, BF3 uses D3D 11.
I had issues when I played Minecraft as well, sometimes the drivers would crash and everything would turn pink for a second and then return to normal, but all Youtube videos and that kind of stuff broke so I had to reload the pages to get the video again.
I think that would be all I have to say, can't wait for HPL 3 which will use DirectX