this post was submitted on 12 Feb 2024
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I have my own IMAP server (Dovecot)with 20 years of messages on it. It's on a linode instance in Hong Kong, I'm in Australia.
When I open my Thunderbird on my laptop, it takes less than a second to authenticate and grab a dozen headers. If I pop open the Gmail app on my phone and select that account, again, it connects and refreshes in the same amount of time. Manually doing the drag-down-to-refresh motion gives me one spin of the spinner at the top of the page, possibly 1.5 seconds.
So my question to you is, what's wrong with your IMAP server?
Small edit: Did a totally unprofessional test with Wireshark and a cold start of Thunderbird and my laptop at 5 percent battery and heavily throttled. It takes 1.3 seconds for it to connect to my IMAP server, authenticate, and then check for unread messages. To grab the headers for 9 unread messages in my 2023-2024 inbox (containing about 3500 messages) takes another 3.5 seconds. To transfer approximately 5MB of data for the message bodies takes another 6 seconds on my wifi at home. For an application that lives in my system tray 90 percent of the time with a persistent connection, this seems fine.