There were some dumb queries with timestamps, performing much slower with Linux-2.6.5 compared to Linux-2.4.25:
The queries used something like this (ts is a TIMESTAMP): ... AND ts LIKE '2003-04-%'
I'm guessing an index isn't being used because your LANG is something-UTF-8 and that got picked up when you recreated your database. Try recreating the database with the C locale and see if that does it.
-- Richard Huxton Archonet Ltd
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