very slow loading page, typing text and
My iMac has suddenly become very slow when making any selection of applications, websites and even typing this question. A rotating circle appears before selection is acquired.
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Hi blackbird52
Try a Safe-Mode boot first which will carry out a basic file system check and clear various system caches that may have become bloated or corrupted.
A Safe-Mode boot is slow and your keyboard and mouse commands will appear "laggy', this is normal.
There is no need to do anything in Safe-Mode other than allow the Mac to boot in Safe-Mode to your user desktop, leave the Mac alone for ten minutes while background boot-up tasks complete and then restart the Mac.
Upon restarting the Mac will be back in Normal-Mode and should respond to mouse and keyboard again at normal speeds.
Beyond the above, do you have any third-party Anti-Virus or "cleaning" applications running, some of these are known to interfere with normal operations of a Mac. If this applies try disabling/removing these and test again.
This linked document describes how to use Safe-Mode:
How to use safe mode on your Mac – Apple Support (UK)
HTH.
Will.