Solved - thanks

I have a network around my home that (in theory) should be a gigabit. I transferred a large file tonight from my PC to my NAS and windows reported it transferring at between 40MB/s and 109MB/s.

Is this the correct speed? Initially I thought it should be 1000MB/s. But then I'm wondering if 100MB/s is correct for a gigabit network?

So my questions are...

1. is an average of 70MB/s about normal for a home network transferring a large movie file from a PC to a NAS?

2. if the speed is low, do you have any software recommendations that will help detect where I'm losing my speed in the network?

Thanks for any help you can give me :-)