gtk2 application start delays 25 seconds

Hello: This occurs in openSUSE Leap 15.3 (64 bit). Gtk2 applications start with a 25 seconds delay. That is, it takes exactly 25 seconds the application window to appear. This behavior has been reported previously in other distros, eg: In 20.04.1 all gtk2 apps starts 25 seconds https://bugs.launchpad.net/ubuntu/+bug/1891245 I installed appmenu-gtk2-module and libcanberra-gtk-module but it did not solve the problem. How can I fix this in Leap 15.3? Thanks, Istvan