Hi, I'm a long-time user and big fan of T-Bird, but I've been having an issue lately that is driving me nuts. When using T-Bird, the program frequently locks up for maybe 10-30 seconds, especially when deleting messages, transferring messages to folders, and when downloading new messages. This is super frustrating because it's hard to get much done when your critical software is frequently locking up the entire system. This happens on all three of my PCs (two workstations and a laptop); two are Win 10, one is Win 11, and this problem is not happening with any other software. I've looked at the task manager when it happens and killed any processes that are taking more than a negligible amount of CPU, but that doesn't fix the problem. It's hard to know exactly where T-Bird is getting hung up without the right profiling tools, but it seems to happen most frequently when accessing the network. At first I thought it might be a disk space issue, but it's still happening on all the machines even after optimizing the disks and deleting the recycle bin, temporary files, etc. to ensure there's plenty of free disk space. The only thing I've tried that seems to help a little bit is turning off the quick filter. I've tried asking support at my ISP (InMotion) if the delay might be caused by the mail server, but sadly they are a bunch of worthless idiots. Any advice or feedback on how we might narrow down or fix this is much appreciated! :) thanks in advance... -B