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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Speed of obarray vs. hash table
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I changed `nnrss-group-hashtb' to be a real hash table instead of an
obarray which made `nnrss-read-group-data' nearly twice as fast (and
causes less consing).

If this is generally true, then it might be worthwhile to make similar
changes other places in Gnus if someone feels like experimenting.