Opening virtual folder performance

[Ross Lagerwall]

Hi,

I use notmuch-deliver with procmail to retrieve my mail and then use mutt-kz
to view it.  The problem that I am having is that mutt-kz takes 10s of seconds
to open a virtual folder the first time after power on.  After that, opening it
is almost instant.  During this time, it appears to grind my hard disk.  I have 
tried setting header caching to a file or directory but in neither case does it
actually cache any headers.

This is with notmuch 0.15.2 and folders with between 500 and 1000 mails in it.
In other words, not much.

Any ideas on what may cause this issue?

Thanks
-- 
Ross Lagerwall