Lag when typing in callsign field

[G4POP]

Well, after a few days of use and after some unidentified Windows update no longer see delays writing, deleting or changing the callsign.
I confirm that I use .net framework installed 4.6.1 after reading Brian's suggestion. I think he has been right!
It may be that it is retroactive and compatible with the release 4.0 and does not create problems in Log4OM.
Anyway after loading the database the program runs smoothly.
These are my latest observations.
73, I3LTT Giulio.

Thank you for the feedback Giulio