May I ask, what was the PC configuration, as well as the FPS of the game?
Here are the specs of the PC I used. They are also included on the last page of the article:
Intel Core 2 Quad 2.66 GHz 4 GB RAM 768 MB NVIDIA GeForce 8800 GTX Windows Vista
Stranglehold has vsync turned on with no option to turn it off (although there may be a command line flag to do that or your video driver control panel may be able to force it off) which kept the game at 60fps on that rig.