R6400 newby optimize wireless speeds any setting config needed?

One thing I am not clear on is if your are trying to boost the speed within your network or if you are looking to improve/increase your internet speed.  These will be two totally seperate things.

A. Your internet speed is limited by your ISP.  As of now, most standard ISP service (residential) is maxed out at 100, and this is only if you have fibreoptic right to the wall of your residence.  This is something to take up with your ISP.  If you are not seeing the rate that your ISP says it is delivering, then there is something else going on either with the ISP or there are clashings of firewalls of your router and your computer system and ISP.

B. As for your wireless network, within your home network, aka your router.  You should have no problem hitting raw high speeds with the R6400 so long as your end devices support it.  

On my R6400, I have the 2.4 ghz setup for "auto" channel and mode "up to 450".  the 5.0 ghz is setup for a high channel that has another above and below it, because it will use adjacent channels to split and parallel.  example use 153 or 157, the mode is set to "up to 1300".

You should have no problems hitting 65-150 mps on your iphones, 130-150 on xboxes, 150-270 on computers, etc.  Again, so long as your end device has the adapter wifi technology to do those rates.  If you are not seeing these connection speeds, then I suggest your end device adapter is not up to the task.  Because the R6400 certainly is capable.

Finally, if you are seeing the raw connection speeds (netgenie) but your are not achieving the throughput speeds in reality - that again points to potential clashings of adapter settings, firewalls, etc.

Hope that helps!

   (I am by no means an expert, just learned alot over the years in trial-error and lots and lots of searching and reading)