I just purchased an Asus RT-AC1900P router and installed the Merlin firmware and I was wondering how I can optimize my 5 GHz for the best performance possible with my Roku stick.
I don't know if any of you guys know your advanced wifi settings.
What is the network radio of the Roku stick like? All I know is that runs on the 802.11n, 2.4 and 5 GHz bands. It doesn't say the max data rate or how wide the channel bandwidth is.
Is there anything that I should change?
My internet service is 40 Mbps down / 10 Mbps up.
For streaming anything from the Internet, you really don't need to optimize anything, since your Internet speed is far below the typical connection capabilities of 802.11AC on 5 GHz. Even if you're planning on streaming local content, you would rarely see streams higher than 60-70 Mbps. That said, I have a UHD movie rip that will exceed 110 Mbps, so if that's in your future you certainly want the best performance you can get.
Looking at your settings, the only thing you might look at is the bandwidth setting. Yours is on 40 MHz. I don't have an AC router, so can't say what other options might be available. You could always experiment with that setting, but everything else already looks pretty well configured.
My sticks are the black ones that I got from Best Buy for $49. That was the only stick that they had at that time.