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Slow throughput between interfaces on ASA - one way only

I'm troubleshooting a throughput issue between two interfaces on our ASA 5520.

Interface 1 hosts our internal lan subnet

Interface 2 hosts our dmz subnet

Copying files from a host on interface 2 to a host on interface 1 has the expected quick throughput - no problems.

HOWEVER, reversing this - copying files from a host on interface 1 to a host on interface 2 has dismal throughput, averaging under 200K.

I'm trying to fix the slow throughput issue going from 1 to 2.  Using the packet trace, I see that 2 ==> 1 does not invoke a VPN tunnel, but 1 ==> 2 does.  (See attached images). Could this be the problem?  How can I make it so the traffic does not flow through a VPN?

Thanks in advance.

Kerry Davis

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