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You're five major system updates back from El Capitan, and Apple has made a lot of changes to code, file arrangements, database structures, network connectivity etc. in the meantime. Apple usually does a pretty good job of clearing away the old to make way for the new, but things do slip through. I recently killed a few prefs files from 2007 that Migration ...


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I'm posting this answer from a late 2010 11" MacBook Air running El Capitan, and I have no performance issues. It runs very well. But this machine has 4GB of RAM, not 2GB, and that might make a difference. Remember that 10.6.8 has not received security updates for years now, and will be full of unpatched vulnerabilities. It is a risk to keep running it.



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