I'm sorry to be unclear. I'm sure it's WRITING exactly what I want and expect. It works perfectly with the delay. The above output is the contents of the file on the FTP server, without delay. Notice it sometimes starts again at A, this time after G, skipping H-R and a few more lines. Do you see the problem? Without the delay I'm sending more data before it is ready, so it gets lost. How can I go faster without the delay? It should go 10x faster without it.