How do you reinstall OS X Mavericks from Yosemite?

Ever since I installed Yosemite, I've had nothing but trouble. I have basically no memory, I can't watch my videos, I can't edit movies, and the format is just nauseating. Any information would be greatly appreciated. Please help!

Do a backup, preferably 2.
Revert to a Previous OS X
Revert Yosemite to Mavericks
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.

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