UploadBufferSize sets the size in bytes of JFile's send buffer for uploads from Windows using the transfer methods URLConnection or sockets. JFile sends data to the server in chunks equal to the value of UploadBufferSize.

UploadBufferSize may be set to any value between 1024 (1 KB) and 1048576 (1 MB). The default value of UploadBufferSize is 1024 bytes. UploadBufferSize values higher than 1 KB do not seem to increase the speed of uploads from Windows clients.