check for aborts after sending each command, rather than waiting till the end of the current table
mutux --verbose table start/finished log message output, include more detail
close the output channel after sending quit, to help finish SSH
use -C (compression) for SSH - so far haven't seen a case where it is worse; use -c blowfish to improve encryption speed and maintain good encryption
use uglier DELETE query search terms to work around very slow unique index clearing due to http://bugs.mysql.com/bug.php?id=31188