Hello! Similar to Ludas question of 11/11/23: There was an update about 10 days ago, after which the Quick Filter started working terribly slowly: 1. Even before I have written the entire keyword (including email address), Thunderbird starts "thinking" and crashes (Not Responding). 2. After some time, about 1+ minute, results appear. 3. I went through Safe Mode on Windows and Troubleshoot Mode on Thunderbird - no change. This account has ~52k letters, IMAP. For accounts with a small number of letters, there is no such delay.