We're investigating network throughput concerns at one particular client site. The perceived issue from a user interface perspective is that data is being transmitted slowly despite an underutilized 1gbps WAN connection.
Almost all of the client machines have the same issue, tested at more than 20 machines. We did find two machines that do not have the problem. We're in the process of identifying what is different in their configuration. We did notice that in the two machines that do not have the problem, we only ever saw at most one duplicate ACK record. The machines that have the problem usually have three duplicate ACK records. One notable difference is that the machines that work fine all belong to members of the network operations team and all of other machines are for "regular" employees. The machines are supposed to be standard but the network admins could have made changes on their local systems, which is another aspect we're researching.