How exactly does Gnus move mail? 77h for moving feels a bit slow

[Hannu Koivisto <azure@iki.fi>]

Greetings,

I wanted to move some of the unread articles in one of my nnml
folders to a new folder for later reading (thus separating them
clearly from the new ones), but after I marked them and hit `B m',
giving a new group name (that was created), Emacs memory
consumption raised by 10Mb and I could literally see each article
being moved.  Move of one article took ten (10) seconds, which IMHO
is a bit too much.  I calculated that moving all the marked
articles (there was about 28000 of them) would have taken 77 hours
-- not good, so I terminated the operation.

Could I move them outside Gnus?  Something like getting the list of
filenames of marked articles and then moving them simply with `mv'
and re-generating neccessary status information so that Gnus knows
the new picture of things.  Or something.  Possible?

-- 
Hannu