Hello, I have on MacMini Mid 2011, 2,3 Ghz i5 with 8GB RAM. I installed El Capitan, but, these make my system very, very slow! Them I installed Yosemite... same think... very, very slow... My Processor rate is between 12%-39%... if these rate is over 10%, makes my system very slow.. the "wheel of death" appears every time! My memory is only on 2GB... In other words.. I think my macmini, is not good fit for these newer version of MacOS... but, I like the opinions of my fellows here... Do you think my mac is very "old" for these newer OS X version? Which version is a good fit for my macmini? here is my setup: Mac mini (Mid 2011) Processor: 2,3 GHz Intel Core i5 Memory: 8 GB 1333 MHz DDR3 Graphics: Intel HD Graphics 3000 512 MB Thanks.