It will have a frame hit no matter what, cuz you are adding more stuff on the panel that requires more resource on your system.
I have a Carenado CT182 Sylane prop with glass cockpit with WXR,TCF and TERR flying over FSDreamteam Honolulu, my FPS goes down dramatically. Flew a non glass cockpit and FPS went back to normal and imagine on a B777. You going to end up flying using these 777 panel features on a default FSX airports only.


Kin M.
(Klax)