Slowww Trqansfer Speeds

100 mb/s ethernet is what I have on one of my computers.  Didn’t know it until I tried to dowload 50 GB of stuff.  100mb/s = 12.5 MB/s.  Actually the whole divide by 1024 or 1000 and other nomenclature, I’m sure I’m wrong because I always have to look it up and M$oft shows MB/s in the transfer speeds, so this is close enough: just divide by 8 for this level of conversation. 12.5 MB/s is the theoretical limit.  20% overhead, plus duplex settings and M$ overhead = 5-6 MB/s, which is all you will be able to get.