I installed wwe 2k15 recently on my pc, but it lags alot.

my specs are :

co i3 3.93 ghz
4gb ram
geforce gts 450 1 gb
windows 7 64 bit

Games like bf 4, bf 3, far cry 3 all ran perfectly but this game lags alot during gameplay. And plays like in slow motion.

i have a feeling whether the game is using my onboard vga instead?

or is it my ram?

i have seen other people play with less specs way better on youtube :/ pls help