Are you sure that the slowness is caused by network bandwidth issues? I only ask because it's easy to jump to conclusions about performance.
I presume that you have run performance monitor and then determined that it really is network throughput that is the bottleneck. In that case follow wanderer's advice. I've only used teaming to provide redundancy; with a couple of hundred users doing file sharing per server I never managed to come anywhere near overloading the NIC.
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