There could be a couple of things go on here, because home broadband speeds are often much greater than the throughput capacity of many corporate networks, and network latency can also be a problem for fileshares.
For example, if your PCS appliances are at full capacity, then you can add more PCS applicances, and sopread the user load across them. However, a single user throughput would still be limited by the throughput of the PCS applaince, and by the corporate network.
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