WinXP network slowness issues(one way only)

I have two machines currently on my home network. With 6 more coming so I am trying to troubleshoot this quickly.
Here's the problem.Machine two can access machine one very quickly. It see's the shares and can dive right in. Machine one however takes forever to get in to machine two. It does get in, but only after about 30 seconds. Once
in, I can navigate fairly quickly. But if I go back out of the workgroup and back in, it takes the 30 secs again.
Both machines are configured the same. Machine one is runing Windows XP Pro and machine two is running Windows XP HE. Machine one was running Win2K and was having this problem. I thought it might have been a Win2K to XP issue. So I upgraded the 2K install to XP Pro(complete re-format install) The problem still exists.
Do any of you have any clues? I am using IPX as my protocal. This way my network is basically private and cannot be seen from the internet(at least not without really trying/hacking). I have TCP/IP unbound from file sharing as well to further secure it. IPX is the only protocal being used for file sharing. The machines are linked via a LinkSYS 10/100 HUB. I never had any issues in the past. Maybe the NIC in the newer 2nd computer is flaky?