How can I control the bandwidth devoted to my Cisco ASA 5510 VPN Tunnel?

I have two manufacturing plants. One in Maine and one in Virginia. We're connected via a VPN tunnel with a Cisco ASA 5510 at either end. The tunnel has worked well for the most part, with one exception. As soon as a user starts to download anything large from the Internet, the tunnel suffers a great slowdown. I can see via tracert that the traffic intended for the Internet not going through the tunnel at either end, but we still experience a huge slowdown when someone downloads. Is there a way to devote say, 80% of the available bandwidth to the tunnel and allow 20% for HTTP? I'm completely new to the hardware and do most of what I do using the ADSM appliction. I do have Cisco support though and could enlist them if needed.
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If you have a Cisco/Juniper/Nortel router before the ASA device you could configure Quality of Service.
mikejcurtisAuthor Commented:
Oh man. Management would kill me if I told them (after I convinced them to buy the ASAs) that we need to buy two more pieces of hardware to make it work right.
I'm really hoping there is something intrinsic to the ASAs that would help me control the bandwidth usage.
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