How do I uninstall the Yosemite upgrade?

I installed The Yosemite upgrade a few weeks ago and my OS is significantly slower even after I upgraded the memory from 2GB to 8. The mouse is sluggish and screen turnover is also slow. The initial OS was Mountain Lion. How do I remove this upgrade? I purchased the MAC Mini on 12/23/2011.
Thanks,...John

To downgrade OS X you will need to erase the disk drive before the older version of OS X can be installed. This is a significant undertaking to accomplish. Before doing that you might want to trouble shoot to see if you can find the cause for the sluggishness.
I suggest you download and install EtreCheck from http://etresoft.com/etrecheck
Run EtreCheck and publish report here. This report will help us to help you.
Allan

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