.lftprc

# you can use `lftp -e 'set file:use-fallocate true ; set mirror:parallel-directories true ; mirror ... ; quit'` to specify options on the commandline, but I could not find a way to do it when using '-c'.
##

# set ssl:verify-certificate no

set file:use-fallocate true

set mirror:parallel-directories true
set mirror:parallel-transfer-count 16
set mirror:use-pget-n 4
# splits each file into these many parts for downloading