I was wondering if anyone could help me I'd be forever grateful, Stupid me had decided to upgrade to El Captain on release date and I'm already having problems. Everything is pretty laggy and I think the problem is that FileVault is on. At the current moment pages load slowly, I try to go into settings and certain panes wont load as it gives me an error message. I have tried turning File Vault off but, it tells me that it can't until it finishes encrypting. That's all fine and dandy until it tells you have a day remaining. I have Yosemite in my purchased apps would it be best to go back to Yosemite?