You can increase the download speed for installing packages using DNF by updating the maximum number of simultaneous package downloads.

Start by editing the /etc/dnf/dnf.conf file:

$ sudo nano /etc/dnf/dnf.conf

Add the following line to enable DNF parallel downloads:

max_parallel_downloads=10

Another option is to select the fastest mirror from the Fedora public mirrors by adding the following line:

fastestmirror=True

If you are using a Red Hat/Fedora-based distro, here are some tips on how to use the dnf tool to query your install history:

Retrieve a list of manually installed packages:

$ dnf history userinstalled

Retrieve a list of all transactions:

$ dnf history list all

List the changes in a particular transaction:

$ history list <num>

Undo/rollback a transaction:

$ dnf history undo <num>