I have the same. Performance is better with HT disabled. See my post some months ago: https://forums.flightsimulator.com/t/performance-degradation-at-lytv-even-with-latest-patch-1-14-6-0/385460
It might be caused by msfs thread design. If one single main thread is heavily loaded, it is better to disable HT and give this thread a complete core and a little bit more headroom.
Maybe things change with the coming DX12 implementation.
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