dnfdragora-updater is responsible to look for new package updates to your system. By default it is configured to do so every 180 minutes.

The problem is, it will from time to time begin to eat 100% of a cpu core for nothing and slow down the system. So, what can you do about it?

1. do kill the process if the problem occures
2. reconfigure dnfdragora to look less frequently (and hope this will resolve or at least mitigate the problem)
3. disable dnfdragora-updater completely, do package updates by yourself with dnf

How to do it

Option 1:
open a terminal and run:

sudo killall dnfdragora-updater

Option 2:
in dnfdragora choose “Options” -> “User Preferences” -> “System options”, enter the interval in minutes to check for updates:

Option 3:
Copy the desktop file to your user profile and add a entry:

cp /etc/xdg/autostart/org.mageia.dnfdragora-updater.desktop ~/.config/autostart
$editor ~/.config/autostart/org.mageia.dnfdragora-updater.desktop 

add the following line to the bottom:

Hidden=true

When the .desktop file has the Hidden key set to true, the .desktop file MUST be ignored. See https://specifications.freedesktop.org/autostart-spec/0.5/ar01s02.html

Now dnfdragora-updater is disabled. Login again or restart to verify.

From now on you can do your package updates whenever you want, just run:

# check for updates
sudo dnf check-update
# apply the updates
sudo dnf upgrade
# clean up, remove obsolete packages from disk (optional)
sudo dnf clean packages