research if really random uuids in couch would affect our performance

I noticed that, for two users created from the same machine, we are getting uuids that differ only in the last 4 bytes:

bb22eeb8e53646886f57b263d250b901
bb22eeb8e53646886f57b263d250d4b0

This is how couch does these things by default. They point to performance issues as a reason. Research if these actually apply to us.

(from redmine: created on 2013-11-05)