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Message: <blockquote data-quote="tkimages" data-source="post: 1610331" data-attributes="member: 181462">My 2010 iMac (i7, 12Gb, 27") seems to be a lot slower than it used to be.  In fact when I switch off completely then switch back on, it can take up to 5 mins before the HDD stops spinning and I can use Safari.  So I'm going to wipe the HDD and reinstall OS X and upgrade to Mavericks at the same time.The question is do I re-install all my stuff from Time Machine and thus stand a chance of installing all the mess that's slowing it down or do I re-install all my stuff from their original sources?I realise that if I do the latter, I will have to backup my favourites, e-mails etc, for a clean re-install if I can find where they are stored on the HDD.So full clean re-install or use Time Machine?CheersTillman</blockquote>

Verification: How many occurrences of a n-u-m-b-e-r between "d" and "f" in this example...(sdgs6ngklu3gd#f9%)?