Meanwhile I updated Tumbleweed to the version "20180920". With this version the starting of die IBM-Notes Client is very quick (even quicker as an my normal Leap-42.3-System) and everything seems to work normal. With Leap 15.0 it still exists. But when I use the Tumbleweed libraries (/lib/ and /usr/lib/) on a Leap-15.0-system instead of the normal ones, starting of die IBM-Notes Client is normal and quick too. So I would like to know, when Leap 15.0 changes to the Tumbleweed-Libraries?