Hi, please help me out with this! So I have a MBP Mid 2010, 2.66ghz, 15inch, 500gb hd, 4gb ram. Recently Mavericks has been acting up on my computer (it would occasionally restart my computer when using the mail app or sometimes safari), so I decided to upgrade to Yosemite thinking maybe by now despite what people said that Yosemite 10.10 would have better updates then when it first came out. WORST MISTAKE EVER! It has made my computer PAINFULLY SLOW! And I have like 300gb free space on my computer too. It was working fine with mavericks, but I decided to update because of the restarting issue that was happening lately. I would rather have my computer restart then it being this slow. I am very mad at apple for this, nobody cares about pretty fonts, we want a good os! And they are being very careless not fixing this issue so many people are having, and it's definitely because the software is FREE and not something they are making money off of selling. I love apple but man this just makes them look bad and I'm very disappointed with their "most powerful software yet" and carelessness towards fixing it. Anyway the problem is I don't have any time machine back ups, which is bad I know, so what can I do to downgrade back to mavericks without losing data or any other advice to perhaps make yosemite more usable or to fix this? (Also I don't want to upgrade ram or anything). And please explain it in simple terms lol. Should I use a USB, put all my files on there, reset computer, and reinstall mavericks through the app store or something? Not really sure what to do, I want to do this without losing any data please. Thanks so much in advance!