Unreliable Internet Sharing in Leopard

I am having a lot of trouble when attempting to share an Ethernet based Internet connection via the AirPort on my Mac Book Pro. The connection does in fact work, but is very, very slow and unreliable -- especially for email. Web browsing is sort of OK, but fetching email via POP and sending via SMTP barely works.
(The machine that is sharing the connection is a 12" Powerbook. Both are running 10.5.1, and Internet Sharing was totally fine when they were both running 10.4.)
One curiosity: if I open a terminal window and run a ping command on the Powerbook (the remote machine getting it's connection via the AirPort, not the one hosting the connection) things do improve; not markedly, but enough to get some work done.
I am wondering if this is a firewall issue at all. I saw on some post that one part of the new firewall looks at the time between incoming packets, and considers those spaced too far apart as "new connections." I don't know if that's true... but it might explain why keeping a ping going improves things a bit.
Anyway, there's enough posts on the net to indicate something is rotten in Denmark when it comes to Internet Sharing on 10.5; but I did not find any answers to help me with my particular situation.
Any ideas on how to fix this?
Thanks in Advance,
Mark

I too am having almost identical problems. My configuration is a MacBookPro (OS 10.5.1) getting an internet connection via a Verizon Wireless broadband Express card which works fine insofar as the MacBookPro is concerned (cable modem or DSL is not an option). I am trying to share this internet connection via airport to my wife's MacBook (also OS 10.5.1). After initial start up I can receive web pages on the MacBook OK, but after several pages of satisfactory operation pages start loading slowly until finally they completely stop loading (Loading X of Y items or Contacting XYZ). At this point all internet functions on the MacBook (mail, software update) are inoperative. Sharing works fine with a G5 iMac, G4 iBook and PowerBook (all OS 10.4)
I have spent hours on the phone with Applecare & in the Apple retail store with technicians, to no avail. Assuming it is an OS 10.5 issue, I hope a fix is forthcoming quickly.

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