Hi, Since updating to Thunderbird 140.7.1esr (64-bit) on Windows 11, moving messages from Inbox to any folder takes about 7 seconds. Details: Account type: IMAP (Cogeco) Happens in all folders Inbox has ~600 messages (not large) Was working normally before the recent update Delay occurs every time moving a message from Inbox to another folder No freezing — just a delay before the move completes No antivirus changes Issue started immediately after update This appears to be related to IMAP sync behavior introduced in 140.x. Has anyone else reported this, or is there a known regression? Thank you.