After installing McAfee Antivirus Plus, writing performance to mapped network drives slowed to a crawl (<50 KBPS).
Reading is still fast (tens of MB per seconds).
The server is listed on the home network in McAfee Firelwall. Common Windows ports, Windows File Sharing ports, and Remote Desktop ports are all allowed.
Turning off McAfee Firewall temporarily, and disabling On Demand scans temporarily has not effect--writing to network drive is still slow.
The patch addressing this was issued last week and we are wondering if it has corrected the problem?
Sorry noone got back to you earlier but we were concentrating on one thread on this subject and I only just noticed yours.