Vertical Sync drops FPS

[SPACoD]

I recently bought a new Full HD 23" monitor and ran Amnesia in 1920x1080. I continued developing my custom story and while I was testing, the image was tearing when I was moving left and right. I then enabled VSync which drastically dropped my FPS when looking at something that is right in front of you, like opening a door or staring at a wall you're touching. My FPS halves when I do that (goes to 30 and tends to stay at 30).

Specs:
OS: Windows 7 Ultimate x64 Build 7601 (SP1)
CPU: Intel i3 2120 @3.3 GHz
GPU: Nvidia (Gigabyte) GeForce GTX 560 Ti @900MHz (Driver Version: 310.70)
MBO: MSI P67A-GD65
Disk Drives: 1 TB WD Caviar Green HDD, 90 GB Corsair CSSD-F90GB2
Monitor: Fujitsu SL23T-1 Led @60Hz (Connected via the VGA cable, analog)
RAM: 2x 4 GB DDR3 @1866 MHz

If you want to try to reproduce the slowdown you can put everything on max except SSAO Samples and go stand right in front of a wall or even stare at the floor.
Note that having VSync off makes the slowdown not happen but then the image starts tearing.
Before I had an SXGA (1280x1024) resolution monitor and I didn't use VSync, in fact I could run it with 128 SSAO Samples with the FPS stuck to 45, it was too much to run it at 60. I enabled Triple Buffering in the NVIDIA control panel but it isn't really helping. Staring at the floor or a wall without VSync make my FPS drop for at most 10 FPS (which is then 50 and it doesn't go below that point).

I will try playing some other games without VSync and see if the image is tearing there.

P.S. I was playing Dark Room as a test custom story, you'll see that in the log. I also saw a thread similar to this one but I thought someone could help me with this annoying problem.