I'm struggling with my wifi setup at home. I've 2 floors apartment. Router is on the first floor (ASUS RT-AC68U) and my desktop PC is upstairs (w adapter ASUS USB-AC56).
I find the connection pretty ok, at least in theory (connected on 5GHz):
Speedtest gives me good results (given that I've 150mbps/15mbps connection from my ISP):
But whenever I'm trying to download something from Steam or just over http it's usually very slow and unreliable (more often like the second one in the picture):
Another one slow or the connection drops (hence aborted download):
Downloading file from a USB stick which is plugged to the router good results (127 / 8 ~= 16):
I almost can't download anything via the browser. Does anyone have a clue how to debug and analyze this behavior? Doing same things on a side-by-side Mac gives way better results.