i face huge frame-rate drop from around 60+ to 9fps around 40+ wave..btw below are my PC spec
Core i3 3.6 GHz
8GB DDR3 1600Mhz ram
Asus Nvidia GTX 750Ti OC Strix Edition 2GB DDR5
latest GeForce Nvidia Graphic driver 361.91
22" inch Samsung Monitor connected via VGA cable
i attach the picture where the my pc shows 9fps game