UploadBufferSize sets the size in bytes of JFile's send buffer. 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).

If JFile is installed on a Mac, the speed of transfers tends to increase significantly with the size of the upload buffer. On Windows, UploadBufferSize values higher than 1 KB do not seem to increase upload speed.