Slow speeds

I've encountered a strange problem. I have RaidenFTPD set up on one computer of my home network, and SmartFTP on another. When using SmartFTPD to download, I hit 11+ MB/sec. When doing a direct upload, I can only hit 192K/s. However, when I do a single thread upload from the global queue, the transfer rate hits ~630K/s. I played with the IO buffer, yet the direct upload is still stuck at 192. I'm using the latest version of SmartFTP.

Mike