I have an rt68 running fresh tomato 2019.4 and I can only get about 200Mbps (to fast.com) when connected via ethernet to my router. However, if I disconnect the router and connect directly to my laptop I can get basically the full 500/500 I expect (tiny bit less). I don't have bandwidth limiting or QoS enabled. has my router hit the end of its useful life for me, I've recenty moved and I had little issue with my 300/30 connection in my old place (able to max out both without a problem...
speeds cut in half or less with rt68 vs direct connection
speeds cut in half or less with rt68 vs direct connection