samba - Jan 2003 - 3.0alpha21 performance degraded comparing to 2.2.5

I tested using the same hardware for windows client and the server, same 
setup and configuration.  Network bandwidth was gigabits.  I built both 2.2.5 
and 3.0alpha21 from source. 

Here are my numbers for a single windows 2000 client, single samba server 
test.  For reads, 2.2.5 gets 120 Mbps, while 3.0a21 gets only 80Mbps, which 
is a 33% decrease.  Writing to samba, 3.0a21 gets a 15% decrease over 2.2.5.

Samba performance is very important to us here.  So please help me to make it 
better.  Anybody know tricks to make samba 3.0alpha21 faster?

Thanks in advance,
Chere