I remember reading somewhere that you can do it by changing some config file, unfortunately I have forgot where I read it or what the exact process is.
My understanding is that while libzypp can do parallel downloads you still need changes to frontend to actually invoke them. And this is work in progress.
I observe that, recently, many of the packages to be downloaded in an update are now downloaded (already in the cache) as I run a sudo zypper patch or sudo zypper update. This speeds up the update process. I suspect that this has come from the “repo-servers” packages that were recently released but I don’t really know where this change came from. The system did not always do this.
The time consuming part of the upgrade process is not the downloads, it is the installs.
I see many other upgrade software in vms of other linux. They are much faster than zypper using parallel downloads and parallel installs. But, I still think zypper has the most comprehensive functionality compared to the others.
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