I just discovered a Workaround for Lags and Stutters during TakeOff and Landing.
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I unticked the Steam Cloud Synchronisation under Properties of MSFS2020 in Steam => Library => Right clic on MSFS2020 => Properties => General
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Then, i deleted the directory : C:\Steam\userdata\1110101617\1250410
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When i start MSFS 2020, i had to rebind all controls after accepting a prompt to update from MSFS.
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After a first flight test, if there are no Stutters, close MSFS and tick the box back in Steam (1)
I hope this can help some of us.
Fly safe