I do not have any performance issues anymore, besides broken textures and glitches, an idle GPU and not used 3 CPU cores,the ATI Ralley Stripes, regular crashes and fading sounds.
So I really enjoy the game too at the moment, at least the FMB. It`s fun tinkering around a scenery and picturing how great it could be to use this all some happy day. Maybe they should have left all the planes out and just give me something to built up.
Flying is fun too(, at least for a few minutes until you remember why you left the cockpit und went for the FMB.) The physics and flight behavior of the planes is really amusing and it makes me grin from one ear to another, when I watch AI Blenheims doing snaprolls in almost perfect formation, even though the leader lost the tail fin, both elavators, one ailron and one engine.

Another of my favorites is watching big formations in a turn. The rain of debris after every waypoint when they crash into each other is really a worth watching.
But that is just when I get tired of fighting the FMB zoom-scale-slider....