All I say is try the PMDG-747 or ATR-72 at Aerosoft's Frankfurt at night and bad weather, with AES, and Traffic Addon 20%. That brings even my old FS-2004 to it's knees while taxiing.
Or try Simwing's Heathrow...
I use to lower some options with destinations like this, especially clouds and traffic. That way frames remain managable