I have a NAS server, D-Link DNS-323, it was out of sync, saved all the data, reset the device back to RAID-1, and started copy back the files with a Windows 10 with the Samba protocol on the NAS. The total amount was around 1.5TB. I've divided the data into the part by directories. All worked perfectly with a gigabit router and on average 15MB/s ( that is almost max since the DNS-323 cpu cannot handle more). During the last directory copy (around 250GB), there was a strange action by the Windows. The copy speed dropped below to 5MB/s after some time. This can be seen from the below screen capture of the windows copy screen ( It did form the beginning I was on the investigation...)
I've wondered the reason, the screen goes black - no!, power saving etc. - no!. First of all, the laptop was plugged in all the time. I've prevented sleep and screen turn of form the current power plans. Nothing worked, except the mouse movement. When I see that the connection drop, I just move the touchpad a little and it goes up to around 15MB/s.
The files are mostly large and the data reading was not a problem.
Why does Windows 10 start to behave like this? Or it was already like this that I did not notice.
What should I do to prevent Windows 10 to lower the copy speed?
