slow log in etc.

[Mobgr]

My iMac Mac (Retina 4K, 21.5-inch, Late 2015) Has become very slow in all aspects how can I fix?

 

[r6mile]

My iMac Mac (Retina 4K, 21.5-inch, Late 2015) Has become very slow in all aspects how can I fix?

Which version of Mac OS do you have? What kind of storage drive do you have (hard drive, Fusion, or SSD)?
Assuming you are running a relatively recent version of Mac OS, and still have a hard drive, that's your problem.

Get an external USB3 SSD like the Samsung T5, use it as your boot drive, and you'll see a gigantic difference.

 

[Mobgr]

OS Catalina 10.15.6 8Gb Ram Mac HD