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Gnome-software, which is one of the top memory consumers, is being loaded at startup and thus decreasing boot time.
I rarely use gnome-software, and on most boot-ups it is useless. However there is not an entry at start-up apps, not even after showing hidden startup apps (https://help.ubuntu.com/community/ShowHiddenStartupApplications). Also, I haven't found any gnome-software-related process from systemd-analyze to disable it with systemctl.
Go to /etc/xdg/autostart/ and remove the
NoDisplay=true
line in gnome-software-service.desktop file (or change true to false). Then GNOME Software should appear in your Startup Applications list. You can disable it from there.
If GNOME Software still doesn't appear in Startup Applications list following the suggestion above, follow the steps below.
Copy of the /etc/xdg/autostart/gnome-software-service.desktop file to the ~/.config/autostart/ directory.
Open the copied .desktop file with a text editor and remove the
NoDisplay=true
line in (or change true to false).
Now GNOME Software should appear in your Startup Applications list. Disable it. Alternatively, you may append an
X-GNOME-Autostart-enabled=false
line to the copied .desktop file.
From https://ask.fedoraproject.org/en/question/92941/how-to-stop-fedora-24-gnome-software-auto-updating/, try these two options:
Disable it in gsettings
gsettings set org.gnome.software download-updates false
If that fails .. mask (disable) the backend service, PackageKit, the service used by Gnome Software.
sudo systemctl mask packagekit.service
