matsuman wrote on Jun 1^st, 2013 at 4:26pm:

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)

1+
He has a point, I wouldn't use WXR unless I can see the weather ahead,and then you best avoid the weather as you will get another FPS hit,depending on the clouds or any other weather programyou are using.