Imac - Application not responding
Imac in now taking at least an hour t become usable due to constant ball rolling and applications not responding- iMac 7 years old - any suggestions?
iMac 21.5″, macOS 10.15
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From the description in your question, it sounds like you could have a full or failing Hard Drive.
So before doing anything else, you need to make sure that you have a good backup.
https://support.apple.com/en-us/HT201250
Then you will need to startup in Safe Mode and follow up with a normal restart.
https://support.apple.com/en-us/HT201262
After that, please run EtreCheck and post back here with your Report.