Why is it that on a totally idle R-Pi B, that normally sits around 0-1% CPU utilization, if I open a LXTerminal window, it pegs the CPU at 100% even if I don't do anything but let it sit there at the $ prompt. It stays that way until I close the window, and then it drops back to 0-1%.
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It is quite possible that the termianl software is simply running a 'loop' contineously checking for keyboard input at maximium speed (rather then checking, say 10x a second and 'sleeping' in between)...
If you are running on batteries this could be quite an issue - if that's the case all I can suggest is 'try a different terminal program' (eg BASH shell) & see if it's different
Piman
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