The system preference takes a long time to load

As the title suggests, end of 2013 (10.11.4) System Preferences on my iMac takes a long time to load, even after a fresh reinstall and/or reboot (tried both). It takes about 20 seconds to one minute each time to open (except when I close it and immediately open it once again, as it is always loaded in memory). This problem existed only after the upgrade to El Capitan, and I saw many other people with iMacs with the same problem. I tried to remove cache for before system preferences files, but that did not help at all. I don't have a FileVault if it makes a difference, even if I did before reinstall, but never turned back (persistent question anyway). Any recommendations would be useful. Thank you!

Data sheet:

iMac (end 2013)

Intel Core i5 at 2.7 GHz

8 GB 1600 MHz DDR3


Intel Pro Iris 1536 MB


I found it is the State of affairs in 10.11 if running a HD spinning.  Don't feel alone.

I suspect that it is a function of low priority in the memory compressed algorithm.

Upgrading to an SSD and it will rise to attention.

Tags: Mac OS & System Software

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