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David Hedbor <david@hedbor.org> writes:
> Why not simply check the number of entries in the overview files? 

When evaluating overall state to make a *Group* display, or to offer
#-of-articles-on-entry query when beyond the gnus-large-newsgroup
limit, Gnus has not yet seen overviews.  Overviews are seen only as a
group is being entered, when the *Summary* display is being created.

> In any case, I still can't see how it would be either hard or slow,

It is not slow.  It is hard.  You are asking that Gnus begin to
examine _individual group content_ at a time when it is supposed to be
evaluating only _overall groups' content_.

It is possible that Gnus could be convinced to do this for non-NNTP
groups, at least for nnml groups in particular -- peek into the dir
during *Group* display creation, count real articles, update the count 
seen.  But it is surely a bizarre thing, given the context in which
the *Group* display creation is being conducted.