Thanks for your suggestions. Confirm Bios is latest one. Went to AMD site and updated chipset software to latest one. No improvement. Went into Bios and tried disabling SVM mode (virtual machine): no improvement either. Pushed LOD to 150 as acceptable tradeoff at airports, keeping trafic off. Hoping further MSFS DX12 enhancements may relieve CPU even slightly (DirectStorage ?).
BTW, no issue outside airports with 200+ LOD.
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