What generates so much traffic with NAS?

So I have a NAS server in my LAN, and a few iPhones and iPads.
I use my NAS over smb, the NAS stands for only downloading to it, so its a big drive with loads of files.
Sometimes I try to play HD movies from it, streaming them but they get laggy. When I turn off the movie, I close the whole player, I check activity monitor and I see something is trying to load data from the NAS. I would like to check what it is, because in very peak times when I would like to stream movies and stuff it gets in and doesnt let me watch the movies.The nas supports 8MB/s maximum data transfer on the network, so it would be enough for a HD stream. When this thing doesnt gets in, the movies play flawlessly.
I connected via ethernet, wifi is turned off.
The nas is attached via ethernet aswell.
Mountain Lion latest version.
MBP 17 late 2011
MDS is turned off and totally unloaded from the system, so it cannot be spotlight checking file sizes.
I couldnt upload the image here so I have attached it in cloudme.
http://cl.ly/NTGU
I am attaching a screenshot of my activity monitor where you can see all the processes and maybe give me a more helpful information.
Please dont hasitate to ask me any questions.

There's no easy way to monitor network usage per process using built-in tools. If you're an advanced user and you want to try, see the manual page for the nettop(1) shell command. It may not be able to provide the information you're looking for.
The third-party products Rubbernet and Little Snitch are supposed to record network usage by processes. I can't vouch for them. Both were available as free trials, the last time I checked. I suggest you uninstall either one when the question has been answered.

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