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Well, everything seems good now. I still haven't had the time to research any performance issues, but I haven't noticed anything untoward, either. Marking this 'solved' since I no longer seem to be having freezes! Thanks so much to all!
Well, I'm no good at this kind of thing, but way back you said something about networkmanager. Try uninstalling that and using wicd for a while, then if that still allows the system to freeze, you know it isn't networking...pretty much.
If it is your X server that freezes, you can check that with "Alt + SysRq + r" and to go into raw mode. Then you can do "Ctrl + Alt + F2" to go to a console. Try to login and run "top" to see what is slowing the system. You can also run "Alt + SysRq + k" to kill all programs in the virtual console including the X server.
Also check the "/var/log/Xorg.0.log" for any hints there. Might be a module that freeze the X server.