NO. I had to wipe the drive and install Yosemite. It's a 2010 mac mini that has never ran faster in it's life on any previous OS.
El Capitan just had a slew of problems..Server didn't run right, constant spinning wheel..and that was after a clean install of El.
so...I just think it's not an "improved performance" as advertised. Maybe for 2015 and newer machines..maybe..but someone else here on this thread got a new iMac last week out of the box and upgraded right away to El Capitan. They said in all their 22 years using mac..they've never felt such a lag just to open System Preferences.
They should've said for 2015 and newer machines - recommended only.
When your hardware on your iPhone is too old..they don't give you the UPDATE iOS update option. They just stop the available updates...
soooooo why not apply the same logic....with the desktops/laptops?
NOT