Hi there,
I am using a DS718+ with two Western Digital drives (9 terra each) in RAID format.
My internet connection is up to 1000 MB/s (I am using cable and not Wifi).
System Health and Resource monitor seem to be very ok.
I am uploading big files from my laptop to my NAS with around 400 KB/s which I think is a very (?) low speed.
Any suggestions on how to increase the speed?

Thank you in advance...please keep in mind that I am not very experienced but I am willing to search & fix with your valuable assistance!