USB is really slow on my host

Hi All,

Scientific Linux 6.1 x64
qemu-kvm-0.12.1.2-2.160.el6_1.2.x86_64

I do not have USB configured in any of my guests. Since adding KVM to my host, my USB 2.0 ports on my host are all acting like USB 1.0 ports (20 times slower).

Is there a work around for this?

Many thanks,
-T