Very slow response times for all sorts of things that are usually instantaneous eg. click on About this Mac took longer to open than writing half this sentence.
iMac 27″, macOS 15.3
One possible cause is that your system drive is too full. The free space ought to be at least 15-20% at all times.
There could also be some third party software that is installed and is causing problems.
Please run Etrecheck and post its full report here. Use the "additional text" button and paste the report into the text box.
Thank you. I will update. Does Carbon Copy Clone fill up a HD with all previous Snapshots?
Very interesting. Too tired to do anything tonight
Has macOS 15.3.1 made my iMac 2019 very slow?
