Vista - vista and chimney

For Java to work, our vendor recommends disabling "Chimney", which does fix
web/iis issues related to Java, but it also causes file sharing and RDP to
work very slowly, making it unusable. Below is the command I entered on the
W2K3R2 web server for Java to work:

Netsh int ip set chimney DISABLED

I have updated Broadcom network drivers on both the client and server and
that didn't resolve the problem. I don't think it's related to Broadcom, but
rather Windows VISTA.

The odd thing is that XP works fine and file sharing and RDP are not
affected, but VISTA machines are problematic. I don't understand. Please
help resolve.

Thanks.