RPM is a low-level tool - it installs packages directly, without resolving dependencies. It’s the fastest for simple operations on individual .rpm files, but it’s not suitable for dependency management.

YUM is an older package manager written in Python 2. It’s slower, with less efficient dependency resolution and higher memory usage.

DNF is YUM’s successor - it uses the libsolv library (written in C), making it significantly faster and less memory-hungry.

On older systems (RHEL 6/7) YUM is the only option of the two and runs slower than DNF.

On newer systems (RHEL/CentOS/Fedora 8+) YUM is simply a symbolic link to DNF – it’s literally the same program, so there is no difference in speed between them.

General speed hierarchy for typical tasks (installation, updates, search): RPM (no dependencies) > DNF > YUM (on older systems only)

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