Well, I don't know anyone facing this problem with postgresql, but at tcp level data sending delays may indicate that Naggle's algorithm is in effect. See http://en.m.wikipedia.org/wiki/Nagle's_algorithm
Vitalii Tymchyshyn-2 wrote > Well, it sounds to me like TCP_NODELAY flag problem.
Can you please elaborate? Has anyone else faced a similar issue with this postgresql/hibernate combination? If yes, can you please provide the link to it.