getting bad transfer speeds on 5Ghz with my note 4

my link rate on the phone is 525Mbit/s and my computer is at 1Gbit/s and for some reason im transferring from my computer to my phones Memory card which is a sandisk 128gb and im only getting around 1-3 MB/s write speed, i don't get it shouldn't the sd card be rated for higher? or is it the chip inside my note 4 that bottlenecks the sd card? im using Es media to transfer the files. And no it's not small files it was around 800MB