Stopping progress reports on log import (no replies)

I have a large number of log files to import and would like to turn off the progress reports in an attempt to speed up the import process. There are 2 python switches which suggest this is possible but I require a little clarification.

--show-progress Print a progress report X seconds (default: 1, use --show-progress-delay to override)
--show-progress-delay=SHOW_PROGRESS_DELAY

Which of the above should be used to turn off progress reporting?

Thanks