Problems streaming from ReadyNAS by SMB with MPC

MK999 wrote:
Any ideas why streaming a 500meg file over 20-25 minutes would use 60-70MB/s of the network throughput, when transferring the entire file only runs at 30-35?

Streaming a 500 MB file over 20 minutes takes < 450 KB/s of network throughput. (500*1024*1024)/(20*60) = 437 KB/s. Network spikes would be a different thing - that depends a lot on the protocol used (TCP/UDP), and the details of the buffer management. There are lots of tricks you can play (multiple connections, games with TCP parameters). Another aspect is that MPC is not writing the traffic out to the local disk. Local disk throughput, antivirus and internet security suites wouldn't get in the way.

MK999 wrote:
Obviously there is some overhead, but this seems to be a fairly small percentage, just running the maths quickly, 30% of the 125MB/s theoretical possible (1Gb/8) is about 37.5MB/s which makes the overhead around 10%

I don't follow your math, and am not really sure what overhead you are talking about anyway. Normally overhead is the extra bandwidth used (over the file size). So if it took 550 MBs to transfer 500 MBs of file, then the overhead is 10%.