I did a quick iperf test of this kind of setup, connecting from a travel router to a home router.
Travel side: PC -5GHz wifi- AR750S -2.4GHzwifi repeater-
Home side: -wan- x86 OpenWRT Wireguard Server -lan- PC
The 2.4GHz wifi and the wan switch are provided by my ISP’s gateway device. So there’s no Internet traversal to add variables.
First just the routed performance:
[ 3] 0.0-10.0 sec 84.6 MBytes 70.9 Mbits/sec
Dslreports speed test was about the same, ~74Mbps
Now with a Wireguard tunnel between the AR750S and the home side router:
[ 3] 0.0-10.0 sec 55.2 MBytes 46.2 Mbits/sec
Several runs of each gave similar results.
When wifi is out of the picture the numbers improve to:
[ 4] 0.0-10.0 sec 315 MBytes 264 Mbits/sec*
[ 4] 0.0- 9.7 sec 83.4 MBytes 72.0 Mbits/sec
And those numbers are more than double what I was able to hit with the MT300N-v2.
*That is lower on firmware v3.022 than it was on v3.009 (it is regularly ~500Mbps on 3.009 firmware), but the WG tunnel numbers are much better. I filed a bug on that in case there was a routing performance regression that needs to be looked at.