I take that back. It's a problem with all final builds of 3.0, where I try to download a file that is at least 20GB. No file is created or prealocated, CPU usage jumps to 50%, disk overheads jumps to 100%, but actual disk usage is 0, memory usage jumps to as much as possible(page file actually, but I have pagefile set to 0 on all drives). Here : http://img827.imageshack.us/img827/8260/issuee.png The problem is limited to version 3,0, I can download fine with version 2.2.1, very low CPU usage, everything is fine. With this kind of a bug, 3.0 should still be in Alpha stages. http://img685.imageshack.us/img685/11/221o.png