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Jul 24, 2012 6:22 AM in response to microzoftby Texas Mac Man,You won't lose anything if you use the Archive and Install method http://support.apple.com/kb/HT1710
OS X automatically defrags.
About disk optimization with Mac OS X
http://docs.info.apple.com/article.html?artnum=25668
How much free space do you have on your hard drive. A small amount can cause slowness.
Cheers, Tom