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Message: <blockquote data-quote="chscag" data-source="post: 1220525" data-attributes="member: 46727">You can get a good picture of what's using memory by opening your "Activity Monitor.app" from Applications, Utilities.  Take a look at what processes are running and how much memory is allocated to each.As far as the HP kernel extensions, that's not unusual as they're different for each printer.  The problem (and I have the same thing going on as you do) is that if you have an HP printer, Apple will provide the entire series of printer drivers and kernel extensions during an update or initial install.I also have a Canon printer and it's the same.  Personally, I wouldn't worry about it.  You have enough memory with 4 GB for running most things.  If you're into graphic design or Cad work, you may want to boost the memory.</blockquote>