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>>>>> Lars Syrstad <lars@no482rs1.aventura.no>:

> Yes, but couldn't the lisp lists be stored?  Why build them from
> scratch each time the group is being visited, when Gnus knows whenever
> an article enters or leaves the group and could update the list then?

You would have to build the actual data structures in memory,
whichever way you go.  I'm *guessing* (note! I do *not* know) that
this would be the bottleneck.