[Pixel C General] crony:
I ran some tests with the method described in this guide. The results were surprising.

My router is an ASUS RT-AC68U running asus-merlin 380.58_beta1, located on the second floor of my house. My tablet was situated one floor below and under, connected on a 5Ghz channel. I estimate a distance between router and tablet at about 30 feet. Download speed was anywhere from 7MB to 13MB. Upload speeds were at around 30MB!

Download

D:\John\Downloads\iperf-3.1.2-win64>iperf3.exe -c 192.168.0.35 -t 30
Connecting to host 192.168.0.35, port 5201
[ 4] local 192.168.0.2 port 57267 connected to 192.168.0.35 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 7.62 MBytes 63.9 Mbits/sec
[ 4] 1.00-2.00 sec 9.38 MBytes 78.6 Mbits/sec
[ 4] 2.00-3.00 sec 6.75 MBytes 56.7 Mbits/sec
[ 4] 3.00-4.00 sec 6.75 MBytes 56.6 Mbits/sec
[ 4] 4.00-5.00 sec 10.6 MBytes 89.2 Mbits/sec
[ 4] 5.00-6.00 sec 7.12 MBytes 59.8 Mbits/sec
[ 4] 6.00-7.00 sec 8.00 MBytes 67.1 Mbits/sec
[ 4] 7.00-8.00 sec 7.00 MBytes 58.7 Mbits/sec
[ 4] 8.00-9.00 sec 9.00 MBytes 75.5 Mbits/sec
[ 4] 9.00-10.00 sec 8.00 MBytes 67.1 Mbits/sec
[ 4] 10.00-11.00 sec 7.88 MBytes 66.1 Mbits/sec
[ 4] 11.00-12.00 sec 6.25 MBytes 52.4 Mbits/sec
[ 4] 12.00-13.00 sec 8.38 MBytes 70.2 Mbits/sec
[ 4] 13.00-14.00 sec 11.4 MBytes 95.4 Mbits/sec
[ 4] 14.00-15.00 sec 9.25 MBytes 77.7 Mbits/sec
[ 4] 15.00-16.00 sec 16.8 MBytes 140 Mbits/sec
[ 4] 16.00-17.00 sec 11.8 MBytes 98.5 Mbits/sec
[ 4] 17.00-18.00 sec 3.12 MBytes 26.2 Mbits/sec
[ 4] 18.00-19.00 sec 11.5 MBytes 96.5 Mbits/sec
[ 4] 19.00-20.00 sec 12.4 MBytes 104 Mbits/sec
[ 4] 20.00-21.00 sec 13.1 MBytes 110 Mbits/sec
[ 4] 21.00-22.00 sec 11.8 MBytes 98.6 Mbits/sec
[ 4] 22.00-23.00 sec 11.9 MBytes 99.6 Mbits/sec
[ 4] 23.00-24.00 sec 11.4 MBytes 95.4 Mbits/sec
[ 4] 24.00-25.00 sec 13.2 MBytes 111 Mbits/sec
[ 4] 25.00-26.00 sec 4.38 MBytes 36.7 Mbits/sec
[ 4] 26.00-27.00 sec 11.8 MBytes 98.5 Mbits/sec
[ 4] 27.00-28.00 sec 9.12 MBytes 76.6 Mbits/sec
[ 4] 28.00-29.00 sec 8.38 MBytes 70.2 Mbits/sec
[ 4] 29.00-30.00 sec 9.88 MBytes 82.8 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-30.00 sec 284 MBytes 79.3 Mbits/sec sender
[ 4] 0.00-30.00 sec 284 MBytes 79.3 Mbits/sec receiver

iperf Done.

Upload

D:\John\Downloads\iperf-3.1.2-win64>iperf3.exe -c 192.168.0.35 -t 30 -R
Connecting to host 192.168.0.35, port 5201
Reverse mode, remote host 192.168.0.35 is sending
[ 4] local 192.168.0.2 port 57335 connected to 192.168.0.35 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 27.5 MBytes 231 Mbits/sec
[ 4] 1.00-2.00 sec 30.7 MBytes 258 Mbits/sec
[ 4] 2.00-3.00 sec 30.9 MBytes 259 Mbits/sec
[ 4] 3.00-4.00 sec 30.9 MBytes 259 Mbits/sec
[ 4] 4.00-5.00 sec 30.8 MBytes 258 Mbits/sec
[ 4] 5.00-6.00 sec 31.1 MBytes 261 Mbits/sec
[ 4] 6.00-7.00 sec 30.8 MBytes 258 Mbits/sec
[ 4] 7.00-8.00 sec 31.0 MBytes 261 Mbits/sec
[ 4] 8.00-9.00 sec 31.0 MBytes 260 Mbits/sec
[ 4] 9.00-10.00 sec 30.4 MBytes 255 Mbits/sec
[ 4] 10.00-11.00 sec 31.2 MBytes 262 Mbits/sec
[ 4] 11.00-12.00 sec 32.2 MBytes 270 Mbits/sec
[ 4] 12.00-13.00 sec 31.0 MBytes 260 Mbits/sec
[ 4] 13.00-14.00 sec 30.7 MBytes 258 Mbits/sec
[ 4] 14.00-15.00 sec 30.9 MBytes 259 Mbits/sec
[ 4] 15.00-16.00 sec 31.2 MBytes 262 Mbits/sec
[ 4] 16.00-17.00 sec 32.2 MBytes 270 Mbits/sec
[ 4] 17.00-18.00 sec 31.1 MBytes 261 Mbits/sec
[ 4] 18.00-19.00 sec 31.2 MBytes 262 Mbits/sec
[ 4] 19.00-20.00 sec 31.8 MBytes 267 Mbits/sec
[ 4] 20.00-21.00 sec 31.6 MBytes 265 Mbits/sec
[ 4] 21.00-22.00 sec 30.9 MBytes 259 Mbits/sec
[ 4] 22.00-23.00 sec 31.4 MBytes 263 Mbits/sec
[ 4] 23.00-24.00 sec 31.6 MBytes 265 Mbits/sec
[ 4] 24.00-25.00 sec 30.9 MBytes 259 Mbits/sec
[ 4] 25.00-26.00 sec 31.2 MBytes 261 Mbits/sec
[ 4] 26.00-27.00 sec 31.0 MBytes 260 Mbits/sec
[ 4] 27.00-28.00 sec 30.4 MBytes 255 Mbits/sec
[ 4] 28.00-29.00 sec 31.0 MBytes 260 Mbits/sec
[ 4] 29.00-30.00 sec 31.4 MBytes 264 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-30.00 sec 930 MBytes 260 Mbits/sec sender
[ 4] 0.00-30.00 sec 930 MBytes 260 Mbits/sec receiver

iperf Done.