I'm transferring a video from a Synology DS 213j attached by ethernet cable to the router. I'm just dragging the video from the NAS to my desktop.
I'm going to try to transfer it to a laptop by wiring the laptop to the router. I guess I'll then bring the router/NAS system into my room to try to rule out wireless loss...but I don't think that's the case. My signal strength, as indicated by Windows, is only 2/5 bars now after moving the router upstairs and just down the hall from my desktop, with little affect on the transfer speed.
Transferring from the NAS onto the SSD on my laptop via wired ethernet through the router only yielded about 41MB/s.