We have a customer that solved the FPS issues on his aircraft that may work for other Navigraph integrated aircraft:
Hi! I solve my problem. There were some kind of a .index file generated to CarenadoNavigaph directory by something. I haven't generate that file. Way that I solve this problem was, that first of all I deleted both Citation CJ2 plane and CarenadoNavigraph directory with Revo Uninstaller. After that I shut down my antivirus program. Next step was to reinstall Citation CJ2 plane and after that I reinstalled the Navigraph update to Carenado products. Then I started FSX and with the plane and noticed that everything is totally ok. Frame rates are okay again.