[Users] Opening an IMAP folder takes several minutes

[mlist at riseup.net]

Hi,

I am experiencing the following problem:

Opening an IMAP folder even when I am offline takes
several minutes (and a lot of hard drive scratching).
The folder size is about 2000+ messages (approx. 2Gb
total) not all of which are cached locally (I have
clicked only on a few). There are no processing rules
running on folder select (or on startup).

Questions:

1. What is the reason for this slowness?
2. How can it be optimized?
3. Or is it a bug to be reported?