Hello everybody, I had similar problem with delayed opening of the right click menu.
THIS SOLUTION SOLVED THE PROBLEM:
Tools > Preferences > disable "Check spelling while typing"
My version:
WIN10 64BIT
10.20.4-win-ddl-public (2893)
Editor: v130.1.16687
Service: v1.38.1
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Hopefully it will help you 2
Regards