Emanuel:
Thanks for the post back on it. Several months back I did have a forum thread going into what I think is the same continuing issue, and "we" did look at journalctl logs . . . can't remember the conclusions. Usually on the forums the gurus say, "You don't know what you are doing," and that is the extent of it. At that time it was, "You need to run as root, and in screen -L" . . . so since then I run a more or less box stock TW system, maintained as zypper determines . . . as root and in screen, etc.
Previously TW was having huuuugggeee number of packages with every zypper, which also took a very long time to run through; in the recent months the package numbers are down, but handling them seems to require considerable "time" in TW . . . . Manjaro is another rolling distro that I have, and some weeks 1 package, but other times 300 -454 packages, but pacman seems to be able to "zyp" through them asap . . . .
I think back then there was some mention of using the "time" modifier on the zypper dup move, but not all of the systems I have seem to be able to do that "time" feature, so I can't show "head to head" evidence of the comparative slowness of TW. I can only "feel" it. : - 0
F