performance issues on windows with 8.3.0?

Are there any known regression issues WRT performance on the 8.3.0.1
binary build for windows?

And I mean serious -multiple orders of magnitude- performance issues
running simple queries on a small database...

A little more background.  I built 8.3.0 on Cent OS 5 today.  Started
using it with a server application that I have to do some
benchmarking.  Java application connecting via jdbc to Postgres on
localhost.  Everything looked great.  Perhaps even faster than 8.2 -
but I don't have the benchmarks to say for sure yet.

Then, I wanted to test what is usually our fastest performing setup -
with the database on a second system.  So, I installed the new 8.3 on
a Windows 2003 system, started it up, created my database, pointed my
java app to it and everything seemed good.

Then I put a load on it - and my server thru-put went from about 1500
messages per second on the linux-localhost combination to 30 on the
remote windows postgres installation.

I will be investigating this much more completely first thing tomorrow
- but I figured I'd ask to see if there was something obvious first...

Thanks,

Dan