Low FPS

Ever since the 4.3.0 update the game has been almost unplayable I can use the D15 and the FWD GTI looking van thing. If I try to use the sunburst or the twin turbo my fps drops to 30 take note this is on the test map. Before this I was able to get 60fps+

PC Specs:

A10-7700K
8GB DDR3 2400mhz
GT 730

Why can I run bf4 at 720p but can not play this at 1080p lowest settings.

Sorry for the terrible sentences 7:30 am and been up 24hrs...