proftpd and sftp

[Adam Vande More]

I've got proftpd running on my server and on a whim tried an sftp 
connection for a website I was working on.  To my amazment, transfer 
speeds increase exponentially.  Getting a directory of about 300 files 
totaling around 5M takes around 10 minutes using default proftpd.conf in 
passive mode.  Same directory takes under 2 using sftp.  These options 
are in proftpd.conf

UseReverseDNS off
IdentLookups off

Why is proftpd so much slower than sftp and any pointers on increasing 
my proftpd performance?

 -- 
Adam Vandemore
Systems Administrator
IMED Mobility
(605) 498-1610