My internet is 600/100 Mb, I have a gigabit switch and cat 5e internet cables in my pc and Nas machine. My PC and NAS is connected to the TP LINK Gigabit Switch. I tested uploading files from Nvme (my PC) to IronWolf Seagate 2 TB HDD (NAS). Writing speed is fluctuating from 50-110 Mbits, 30+ Gb files took it 11 minutes to upload. Is this actually normal?