For the record, At home I have a humble Mac mini 2012 edition with 8gb ram and whatever graphics chip comes shipped as standard I run uk photo realistic scenery, several libraries, my own club airfield modelled in 3d and being careful with rendering setting and screen resolution can achieve 30fps with 10.41
My advice - start low and work up.
Added later. Must own up to the fact I'm not flying heavy metal, but I do fly low level in a glider but even so I can get 27fps with the default Cessna
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