Speed up Apple Mail With Database Cleanup Automation Task
Apple Mail isn’t the best email app out there , but it’s user-friendly and gets the job done for most people. However, one of the common problems is slowness, which App Factor suggests to fix by clearing the mail database from time to time.
This is a pretty old trick , but useful nonetheless. The idea is to clean up the indexing system, which in turn will greatly speed up mail. You can do this manually from the command line (the command depends on which version of macOS you are using), but it’s much easier to set up an Automator action that runs every time you close Mail. Once you do that, you will never run into a slow email application again. Go to App Factor for guidance. If you just want to test the command once, skip to step nine in their manual, copy the command for your operating system, and enter it into Terminal.
How to Speed Up Mail on Mac | Application factor