Re: performance issue
It shouldn't be any different from single-boot Ubuntu. Does your System Monitor show any programs using up a lot of CPU time?
Also, if you've installed Ubuntu as dual-boot with Windows and you performed this using Wubi (the installer that runs within Windows), then yes there is a performance penalty. This is because your Linux filesystem is mounted within your Windows one. You can avoid this by doing a real dual-boot installation using the Ubuntu-based installer on the Ubuntu CD.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.
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