It is normal for a small freeze when saving data for a complex aircraft. This is nothing to do with FSUIPC - that just calls the SimConnect function to save the state. However, if its taking that long, this is usually due to anti-virus interaction. Try removing the flight-save folder from anti-virus scanning - that should improve things somewhat, but you will most probably still get a delay, but should only be a second or two. Also, to get around this issue, there is a control function th