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I installed Catalina 2 days ago and now my 2019 iMac is very slow, click to open an app, wait 4 or 5 seconds and nothing happens, then the spinning rainbow wheel of death appears for a few more seconds, then the app opens. This evens happens when opening System Preferences or Activity Monitor. I have restarted multiple times and the iMac has been left shut down for a few hours before restarting.
iMac Line (2012 and Later)
Even after installing the Supplemental Update my iMac (5K, 27", 3.6 GHz 8-Core Intel Core i9, 64GB DDR4, 3TB Fusion) is still incredibly slower than when I was on Mojave. I mean I used to open like 50 folders in the blink of an eye & now you can literally watch each one open because they take about 1sec each now. It's painfully slow. I even installed fresh with no 3rd party apps at all & it was still painfully slow. There are complaints all over the Internet about the speed. So far, everything I have tried has been futile. There is nothing in the Activity Monitor that's using abnormal CPU usage either making this issue even more odd. I hope they address & fix this soon.
Catalina messed up my iMac. Are all the smart engineers at Apple died with Jobs? Really steaming right now. Can't do anything.
I had to uninstall all 32bit software and Microsoft Office and had to reinstall all Adobe softwares. It runs noticeably faster but still way slower than before Catalina
Removing Adobe solved the issue for me!!!!!! I went from a crippled computer back to normal funtioning nearly instantly. Thankful for TheStubbornGuys solution!!!!!!!!!!!
My new iMac running Catalina was unbearably slow. Removing those Adobe launch agents fixed the problem. Thanks a million!
Get an SSD or more ram. That usually makes the apps faster to boot and for the Mac to startup. You can also try and disabling background apps that you don’t need enabled.
iMac slow after Catalina instal.
