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I installed the upgrade on my Mac book pro and now my computer is totally ruined, the performance is absolutely unacceptable, every time I click on anything, it takes about 30 second to even react to the click and most of my programs don't work. It is super super slow, I'm having issues with simple things like the photos app or powerpoint, I'm very disappointed that that's how El Capitan "improved" my performance. Is there an easy way to uninstall it and "downgrade" back to my previous operating system? I don't want to lose the content of my computer but I basically cannot use it as is because nothing works except for the internet and that is also super slow. What do I do?