I've been running a patched tcpip.sys for quite a while now, don't remember the value I've tweaked it to, it's within the recommended guidelines but still almost certainly overkill for my amazing 256 kbps "broad"band connection (the only "unlimited downloads" plan my ISP provides that doesn't cost a bomb). Still, if I can't patch it and I see the download speeds drop that'll be an excellent reason for me to roll back to XP SP2, which works brilliantly!