It is slow to login after I changed some settings (I don't remember what they were).
How do I reset my user settings in a way that does not delete any applications that I have installed?
If they were Unity related changes (i.e. you used "ccsm") then you can run a command to reset unity to its default settings: Press Alt+F2 to open the "Run command" dialog, and enter the following:
WARNING: This will reset ALL your unity related changes, including launcher icon size and panel transparency (from my experience almost all compiz settings are reset). This is a rather delicate command and should be used only when truly necessary.
If you were using
If you were editing a particular application's settings, you can remove it along with all its config files using the command:
Overall, you're best bet is to simply remember exactly what you were tweaking, and reverse only those changes.