I'm using TB 60.9.1 on a Mac running Catalina 10.15.1 TB is EXTREMELY slow when I move an email message from inbox or outbox to a local folder, and extremely slow when I am reading emails and jump from one email in the folder to another. I have a lot of emails stored in local folders. I use POP mail and store all my email on my computer. I need to keep records of all email for work purposes. I don't know the total amount of email that TB is storing for me, but it is a record of all my work-related email for about the past 10 years. Is it possible that the large volume of email that TB is holding is the cause of TB slowing down? Every Sunday I review all emails that I sent and received in the preceding week, and file them away in local folders. (Basically, I clean up my inbox and outbox.) Each time I move an email from inbox/outbox to a local folder, I have to wait 15-30 seconds (spinning beach ball) before TB displays the next message in the inbox/outbox. Any ideas for why TB has become so slow? And any suggestions for how to fix this?