Play it on high settings, fps isnt everything in fact this game seems more like MGS then CSS to me so frame rate is not so important.
Also do it on delta difficulty and take your time
Frame rate is not so important?
Frame rate is important in -every game-.
Ofcourse I'm talking if you're getting sub 24-30's then you start to notice, well to be frank you can notice up to about 60 or so but playability isn't really hindered.