I have recently installed PMDG 737ngx 800/900 and FS X. My pc is not the fastest, but at the moment it is just about ok with FSX. My problem is that when I try and pan across the (virtual) cockpit view, or up and down, using the top hat switch on the yoke, the view changes in fairly large jumps. With the 737ng 600/700 running with fs9, the pan is smooth.
I have tried reducing the scenery demands to achieve a better frame rate, but that seems to have no effect. Could someone please help? Thanks.