There’s no real fix. Options are:
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Reducing the framerate of the cockpit displays, e.g.:
Highonsnow Glass Cockpit 15-19 FPS boost on Airliners and 10-21 FPS on GA Aircraft -
Turning down CPU-intensive settings – will probably not help a great deal though.
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Getting a faster CPU (won’t give you great results though) – not really applicable for you.
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Waiting for the next patch which is supposed to “markedly improve” this situation. We’ll have to see.