Alvaro Herrera wrote:
> One thing to look at is the rate of WAL generation for a set number of
> transactions. Maybe the later releases are generating more WAL due to
> multixacts, for instance (prior to 9.3 these weren't wal-logged.)
Also try 9.5alpha2, wherein bug #8470 is fixed, which is a big
performance regression in 9.3 and 9.4.
--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services