I own TP-Link Archer C2600.
It has Dual-Core 1.4 Ghz CPU. I'm using it with SQM and 250/20 Mb/s connection.
I noticed that the second core is not being used almost at all. The entire device feels sluggish. I can't get more then 150 Mb/s with cake/layer_cake. The performance is shitty. The bufferbloat goes through the roof. With the previous old WR1043NDv1 (400 Mhz CPU) I was getting much better performance. The htop shows almost 100% usage for one core during speedtests.
I thought that the IPQ806x platform is powerful but this feels like a disappointment. Can anyone share with me their experiences with SQM and IPQ806x platform?