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[Semiliner]

Hello,

Please help me find my FSX:SE bottleneck.
Everything is fine mid air but when my plane is moving through a downloaded (f.e. Aerosoft airports) it gets really laggy.

MBO: ASROCK 970 PRO 3 R2.0
CPU: AMD FX X6 66300 3.5GHZ, SIX CORE
VGA: RADEON R9 390X, 8GB DDR5
HDD: SEAGATE ST1000DM003, 7200RPM
RAM: 8GB, DDR3
OS: Win 10, 64bit

I've read countless posts and some of them suggest that FSX has trouble utilizing multiple AMD cores. Correct? If yes, any way I could fix that?

Thank you!