Try if some of the other works better and you can also tweak them. The option there is all the kind of windows provides for changing how reading/writing should be done.
Also check the logfile to find what is slow, if it is the read or write that is slow. (Scroll to the right side of the log entry for a "copied : ...." line , there is a Read data time and Write data time info.
But so much external factors does also affect read/write speed. specially over the network.