While working on this review of the FreeAgent Go Dock+, I kept wondering how I would be able to test actual performance when using this product. The obvious answer was to test an actual external drive while connected to the Dock+ and a system. Then to test the Dock with more than one drive connected (one on the actual dock and the other on a standard USB port). The last would be to benchmark performance with multiple peripherals attached. These would be a USB mouse (Cooler Master CM Storm Sentinel) and a 16GB Zune HD. This should give the best indication of how the Dock+ will perform under typical use.
As you can see, despite loading up the Dock+ with multiple devices, you are still able to get decent bandwidth. True, it is not quite the level of e-SATA or FireWire, but it is good enough that you won't have to worry about losing performance if you choose to run more than one drive on it.