I'm guessing the main problem is that I can't cancel an IMAP request once it goes out. When you scroll down, one at a time, through all of the messages like tha

I'm guessing the main problem is that I can't cancel an IMAP request once it goes out. When you scroll down, one at a time, through all of the messages like that, I have to wait for ones that scrolled offscreen long ago before I can read out the details for the ones onscreen now. Adding an option to fetch all headers when opening a folder might be wise, or just fetching the offscreen headers in the background while idle. Another thing some email clients do is open several IMAP connections, but pooling connections to implement cancellation could get icky. aerc will also support maildir before 1.0, which doesn't have the same issue, and will be at least as fast as mutt. >Also, I'm not sure how you'd make threads work while loading message list only partially. So full load of the message list is needed anyway (at least once and cache it locally). It's not some failing. I want thread that started 5 months ago to pop forward if new message is posted to it. IMAP has a thread extension I intend to put to good use for this purpose.