Downloading large attachments in thunderbird is extremly slow on my computer. After some debugging, I found that it was because it downloads the attachments in chuncks of ~10kb. So when I have an attachment which is 1MB big, Thunderbird makes ~100 requests to the server of different chunks of that attachment.
Here's a log containing the IMAP communication between the IMAP server and Thunderbird. At 20:35:05.864, Thunderbird starts to fetch cunks on 10240
http://hmailserver.no-ip.org/thunderbird_post.log
I know I can turn off fetching in chunks by changing the mail.server.default.fetch_by_chunks setting in mailnews.js. But what I'm wondering is if it's really supposed to be this way? Or is something fishy going on?
I'm using Mozilla Thunderbird 1.0.6 (20050716). Running on Windows XP Service Pack 2.
