Even if i have the antivirus scanning turned off the speed with which i can use ftp is limited to around 320 KB/s per connection. For example, if I'm just downloading one file it max's out at 320 KBs/s. If I download two files simultaneously I can get the same speed for both (~320 KB/s). If i turn the ftp proxy off and add a packet filter rule i can download at my connection's full speed. What's the FTP proxy doing that limits downloading speed?