I recently installed archarm on my Rpi3, and I mounted a 500gb HDD to it using a sata to usb adapter. The only issue is that whenever I mount it to my main laptop as an nfs, and I try to read/write to it, it is unbearbly slow as in several days for ~1gb. Is the Rpi3 just naturally this slow? Maybe it's important to mention as well that whenever I am connected to a monitor via hdmi, and I bump the desk or move the rpi, i get a voltage error and after a few moments < 1s it says voltage normalized (or something along those lines). Could this be the cause of the slow read/write?
Also if it's important to note whenever the hdd is connected to another laptop and again I have it mounted as an nfs to my main laptop, read/write operations are slow, but not a few days for ~1gb.