I don't know about the hows or whys, but I noticed that YIM was slowing my system down, so I actually use Pidgin instead...plus, I can log into a ton of different clients (currently logged into 3) instead of running the programs

as for the defrag....I don't know why it would slow down your system.

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.