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A noticeable lag of 5-10 seconds when in sim

It's been found that occasionally when in Sim and navigating through the MCDU, there's a noticeable 5 to 10 second lag between button press and response.

The fix is incredibly easy to complete. 

Simply stop the Nvidia GeForce Instant Replay function, allow the sim to settle from that minor change and you'll find the lag disappear.