Slow copy speeds

Odd behavior. When transferring files from a end device -> NAS I get about 10-15MBsec (which I'm pretty sure is network related). When copying a file from one location on the NAS to a different directory I get about 3MBsec...

Already completely confused that a network transfer is 5x the speed of read/writting from the same drive. Tested HW speeds with with "conv=fdatasync if=/dev/sda1 of=/tmp/test.img bs=1G count=2" and got roughly 100MB/sec

These are all large video files. Thoughts?

FYI extra info. OS is running on a SSD separate from the 3.5" drive the storage is kept on.

Platform is a HP Proliant dl160, ESXI. Resources given to the host = 1x Intel Xeon 5630 and 4GB ram. Doesn't even come close to maxing that out when transferring. Maybe running at 5% cpu and 15% memory.