this is not true, my connection is 500Mbps and whenever I do a speed test I get the full speed, sometimes even more.
Another thing is that you have not known how to configure your R1 correctly
You didnt read my post correctly . It does not handle speeds above 200 with congestive control on, at the desired percentage rate above 200Mbps. When I was running 200 Mbps at 90% it would run at 180 Mbps. When I upgraded to 300 speed it wouldn't run above 200 with the same 90% configuration. Hense the "speed cap" on CC. Im pretty sure thats due to the hardware limitations on the R1. Your 500Mbps speed is set on the R1 with out CC enabled and with Turbo+Super Turbo on as well. Im very familiar with the R1 and routers in general , TYVM.
I addressed this topic in another thread that i started and Netduma didnt really come up with a solution although I heard some suggestion to put another router in front of it , and was told that the 30% was a standard drop even at 99%. Others have had the same issue as well.
You can look up my thread if you dont believe me. Its one of the first things I ever posted in this forum.