Not sure if you are mix and matching units, when you see high 30's, you mean megabYtes? If so, you are pretty much at the cap of wireless N, 30 MB x 8 bits in a byte = 240 Mb(it).
I had some time to do some actual testing and some math, and I am in fact maxing out the router's wireless rated capabilities (actually exceeding them a bit).
The only time it causes a problem is when streaming over the Roku box, which always downloads at the highest rate it can, even when the bitrate is manually overridden in the "secret" menu. That changes the stream selection, but it doesn't change the speed at which it downloads chunks of data. It just does so less often when a lower bitrate is selected. So it doesn't actually "throttle" the connection.
The problem this causes in a nutshell is that it increases the error rate. I also figure that it isn't doing the router any good. But the router works so flawlessly for everything else I need it to do that I'm reluctant to swap it out. It's been entirely trouble-free and has outperformed small-business routers that cost me three times what I paid for it. It also has a lot of settings that I really don't feel like re-creating on a new router.
So I decided to buy a newer Roku box with an Ethernet port instead. I don't care for wireless when wired is an option, anyway, and I have a wired Ethernet jack right behind the TV that the Blu-Ray player was plugged into. The only other device I have that actually needs wireless is my BlackBerry, and that's low-demand. It mainly just checks email. Even my laptop is on a wired connection almost all the time.
While I was on Amazon ordering the Roku, I also ordered an identical router to the one I have that I can configure using a configuration backup from the one already in service. The router is only a consumer-grade Western Dig N600 and is now considered obsolete. I purchased it locally as an inexpensive, "temporary," emergency replacement about two years ago, but left it in service because it works so well. But now that it's officially obsolete, it's
dirt cheap (a bit over $20.00 from Amazon), but it still works perfectly well for what I need it to do: except run the Roku box, which will be a non-issue once that's on wired Ethernet.
Having a pre-configured spare is a downtime-prevention strategy. It saves me from a
minimum hundred-mile round trip to buy a new one "locally" if the one I have craps out -- and that's assuming that I limit my sources to Wally World, Sam's Club, or Best Buy. To get to and from a "real" computer store like MicroCenter, I'd have to kill the better part of a day in travel.
What I'll probably do is configure and install the new router as soon as it comes in, and use the present one as the spare. It kind of goes against my grain because I've generally avoided consumer-grade stuff in the past. But hey, it works, it's cheap, and having an identical spare reduces downtime to minutes if it fails.
Rich