Hi thank you for your input. Do you have the link to the thread you are talking about or know what I should search to find it?

Yes thank you for your help. Is kind of what I was afraid of, but sometimes even the unqualified machines work with out a problem. keep well.

Thank you that would be great. Does the fact that it is only the i5 version of the model make a big difference? Maybe I need to just get the i7 model.

Is that the 8.5 release and any clue as to when it might be?

Sorry. It is 8.4.1

Hi all. Can anybody tell me if the iMac 5K MF886 27" i5 3.5 GHz AMD Radeon R9 M290X with 24GB Ram should perform better on El Capitan. I am currently on Yosemite and it is very slugish. am I waisting my time with machine or will it perform better once a El Capitan patch is out. Thanks for the help. Robin