Extremely slow typing in command line

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http://www.linuxquestions.org – I use gnome-terminal for working on the command line, and I've noticed that sporadically (few times per day), the terminal becomes extremely slow to the point where it takes one second to type each letter. The behavior lasts for a few minutes. While this is happening, other graphical software like firefox will not slow down. Closing other programs does not seem to help. If I run "top", I won't find any program consuming large amounts of system resources. Switching to xterm instead of gnome-terminal does not help. Below is the output of "cat /proc/version": Linux versi (HowTos)