I pay for 300/20 and get that speed when I connect directly to my modem. When I connect directly through the NetDuma, I only get 100/10.
I have reviewed various other threads and have followed the instructions given to other people including:
Share excess enabled
Reset device prioritisation & apply
Disable IPv6 in WAN, LAN & misc
Disable deep packet in misc
Enable turbo mode
Ensure the ethernet cables you're using connecting the R1 to hub & R1 to PC are Cat5e+/can handle your speeds.
Do a wired speed test from a PC
I've also followed and read the article "Why is my Connection Speed Lower" and it still doesn't solve the problem. I'm on version 1.03.6g.