I have started a new thread though it is similar to a complaint in March 2021. I find that eM Client becomes almost entirely unresponsive to inputs - not just typing but attempts to read new emails, etc. I have installed the most recent version of 9.1 and I use eM Client for both contacts and claendars. The database is stored on an SSD partition but it is quite large - see below. My impression is that the unresponsive behaviour dates to when I started using eM Client for contacts and calendars. Certainly the logs suggest that the slowdowns occur during synchonizations. Hence, I have disabled the CalDAV and CardDAV options on all but one account.
As suggested I have altered the synchonization interval to 30 mins but I am not very happy with that as I would like to collect emails more frequently without manual intervention. Is there any way of setting separate time intervals for email checks and contact/calendar synchronization? Is there anythig else that I should do? I have already disabled conversations.
Finally, I would mention that the time taken by backups is awful. I carried out a backup before installing version 9.1. It took nearly 3 hours despite the fact that I barely used the computer during the backup. The backup file is 17.5 GB but nonetheless that is very slow.