For a desktop machine running KDE/Gnome, that might be a bit underpowered. I have a RH 9 server running on a PI-133 with 128, and while it's not a race horse it works well as a proxy/firewall.
The control center in KDE can help you adjust the packages you have on the system. Or from the command line you can always do a rpm -q <packagename> to see if something is installed, and a rpm -e <packagename> to remove it.
If it is painfully slow, type ps -A at the command line and see what services are running. You don't need to run a lot of services that start by default and shutting them off can yield big performance gains.
