ssh connection incredibly low

Hi,

I compiled openssh exactly the same way on 2 identical HP-UX 11.11 servers
(same patches level, same hardware config, etc.) and for an unknown reason
the ssh connection to one (server1) is very quick but very slow to the
other one (server2)...

I traced the connection to both of them, and the second one get stuck at
this level:
debug1: identity file /home/user/.ssh/id_dsa type -1

Note1: the user home dir is NFS mounted on both machines => same home dir
from both servers.
Note2: the server load is about the same on both machines.

$ ssh -vv server2
OpenSSH_3.8.1p1, OpenSSL 0.9.7d 17 Mar 2004
debug2: ssh_connect: needpriv 0
debug1: Connecting to ncegc201 [172.16.133.12] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/identity type -1
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug2: key_type_from_name: unknown key type '-----END'
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: identity file /home/user/.ssh/id_dsa type -1
!!! Long time period (around 2mn) !!!
debug1: Remote protocol version 1.99, remote software version OpenSSH_3.9p1
debug1: match: OpenSSH_3.9p1 pat OpenSSH*
...
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 131072
Last login: Fri Dec 17 14:11:34 2004 from serverx

Could you please give me some clues ?

Rgds,
Sabrina