Running Catalina (10.15.2) on a 2018 MacBook Pro. Whenever I change the specific calendar assigned to a calendar event (personal to work, for example), I get the spinning beach ball and a delay of 30 seconds or more. This does not happen on my iPad or iPhone.
MacBook Pro 15", macOS 10.15
You can try reinstalling the 10.15.2 Combo Update on top of your existing macOS to sort anomalies.
Combo update macOS 10.15.2 https://support.apple.com/kb/DL2028?viewlocale=en_US&locale=en_US
To trouble shoot further you can:
Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login and test. Reboot and test will take a little longer as caches get rebuilt.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
Test issue in another user (or guest user) account https://support.apple.com/en-us/HT204443
This will tell you if it a universal issue or isolated to your user/admin account.
You can try reinstalling the 10.15.2 Combo Update on top of your existing macOS to sort anomalies.
Combo update macOS 10.15.2 https://support.apple.com/kb/DL2028?viewlocale=en_US&locale=en_US
To trouble shoot further you can:
Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login and test. Reboot and test will take a little longer as caches get rebuilt.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
Test issue in another user (or guest user) account https://support.apple.com/en-us/HT204443
This will tell you if it a universal issue or isolated to your user/admin account.
MacOS Calendar
