On 2015-07-07 21:13:04 -0400, Tom Lane wrote:
> There is some discussion going on about improving the scalability of
> snapshot acquisition, but nothing will happen in that line before 9.6
> at the earliest.
9.5 should be less bad at it than 9.5, at least if it's mostly read-only
ProcArrayLock acquisitions which sounds like it should be the case here.