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Kai.Grossjohann@CS.Uni-Dortmund.DE (Kai Gro=DFjohann) writes:

> > Quite a lot, I think, in the case of IMAP.  AIUI, it uses IMAP's
> > move command while splitting - if it didn't, it would have to
> > download each article and upload it again.
>=20
> That's silly, of course.  I think that all of Gnus could benefit from
> a faster move method.  So why don't we add logic to Gnus which allows
> a faster move?  The logic would take the source and target groups as
> input, then decide whether a fast move is possible, and invoke the
> fast move function as applicable.

This wouldn't help non-IMAP mail splitting since they don't use "move"
or "copy" at all, but rather "append".  Which is good and fast for
nnmail-like backends.  A backend independent splitter that used
backend optimizations where possible, with a user interface something
along the lines of

http://www.gnus.org/list-archives/ding/199901/msg00485.html

would be nice, and not very difficult, I think.