Boeing 777 cockpit fps drop

Hi there, so, just installing a posky B777-300 but I notice a  10 - 12 fps drop in cockpit view compared to default  cockpit aircraft, anyone knows why, does texture compression may solve this problem? I'm completely lost. Please check the next 2 files. Thanks for help.

http://postimg.org/image/47guni66l/

http://www.hostingpics.net/viewer.php?id=468324Untitledq.jpg