The WiFi at my house has been somewhat slow and unreliable lately, so I decided to look into it. I did a lot of experiments with Speakeasy's Speed Test. I also upgraded my wireless access point from a Linksys WRT54GL to a ASUS RT-AC56U, although that wasn't strictly necessary. I fixed it to the point where my DSL connection is once again my bottleneck. Here's what I learned.
First of all, the "wireless neighborhood" I live in is very different these days than when I first setup my wireless access point. When I first set it up, I only had 1-2 devices connected to it, and there were no other wireless access points in the neighborhood. These days, I have 3 wireless devices connected to my TV, 7 Nexus 7s, 2 laptops, 2 phones, and a Rasberry Pi all connected to the same access point. Furthermore, there are 5-7 wireless access points in my neighborhood (which is still low compared to some neighborhoods). Since wireless bandwidth is a shared resource, I'm sure there's quite a lot of contention these days.
Another thing I noticed is that a lot of the APs were using channel 6. Simply switching to channel 11 made my wireless stop sucking. My guess is that newer APs are better at picking the best channel than older APs are, but I don't know that for certain.
Furthermore, I suspect that my Linksys WRT54GL was dying. Since I have a 100 year old house, devices tend to die from time to time. Hence, I've had to buy a couple Linksys APs over the years. Sometimes doing a factory reset and then reconfiguring it is enough to fix the problem. However, this time, even though I could log into the device, when I tried to do a factory reset, it didn't work. I wonder if that could possibly do with old flash memory.
Here's another trick. My buddy at work, Chris Dudte, pointed out that almost everyone has 2.4Ghz devices and APs these days, whereas very few people use 5Ghz, even though the 802.11a standard has been around forever. If you're confused by the different frequencies and the different 802.11 wireless standards (as I was), check out this useful overview. I was able to setup a 5Ghz network for my wife and I (since we have laptops and phones that support 5Ghz), whereas the kids are on a 2.4Ghz network (since their Nexus 7s don't support 5Ghz).
As I mentioned, I upgraded my wireless access point and router from a Linksys WRT54GL to an ASUS RT-AC56U. The guy at work who's in charge of wireless gave me a thumbs up when I told him that, so I assume it was the right decision. Although I was able to fix my problems with the Linksys WRT54GL simply by changing channels, I'm excited about the ASUS RT-AC56U for a few reasons. My favorite feature is that I can use one device to run a 5Ghz protected network, a 2.4Ghz protected network, and a completely open, but segregated guest network. Previously, I was only using a 2.4Ghz completely open network (because I'm a fan of open networks). It's nice to be able to continue to provide an open network, while segregating and protecting the rest of my house. There are a ton of other features as well, such as the ability to plug in USB hard drives and USB printers, but I haven't tried any of those features yet. I'm also excited to try the new 802.11ac wireless standard that it supports, but I don't have any other devices that support it yet.
Since DSL is still the bottleneck, you might wonder why faster wireless speeds matter. When all of your devices only talk to the internet and rarely talk to each other, it probably doesn't matter. However, once in a while, I need to transfer things from one laptop to another. With the Linksys WRT54GL, transferring files between laptops over wireless was ridiculously slow. With the ASUS RT-AC56U, it's much better. Of course, I prefer to keep a cross-over cable handy when I move large amounts of data between laptops, but it's nice to have the wireless network if I only need to transfer a couple gigs.
Since I've mentioned DSL multiple times, you might wonder why I don't switch to cable. One reason is that I don't want to run cable to my house. I just spent a lot of money putting new siding on my house, and I don't want the cable guy to mess it up trying to punch a whole through it. However, the biggest reason I don't want to switch to cable is that Comcast cable is well known for being one of the most disliked companies out there. It routinely has the lowest customer satisfaction ratings. Hence, I stick with DIRECTV and AT&T DSL (which was originally SBC Yahoo DSL).
By the way, one thing that surprised me was that I can actually get faster download speeds over my T-Mobile phone (while on BART) than I can over DSL. However, the T-Mobile coverage at my house sucks, as does AT&T, Sprint, and Verizon.
If you're interested in the raw data for all of my tests, here it is:
Linksys WRT54GL (several years old): Wired: Download: 5.13Mbps Upload: 0.59Mbps Wireless (originally channel 6): Download: 1.33Mbps Upload: 0.43Mbps Wireless (changed to channel 11): Download: 5.13Mbps Upload: 0.60Mbps Downloading 1.1GB from one laptop to another over wireless: 15-20mins ASUS RT-AC56U ($200, new at Frys): Wireless 5Ghz (with QoS enabled, on top of my microwave): Download: 5.19Mbps Upload: 0.58Mbps Same on 2.4Ghz. Downloading 1.1GB from one laptop to another over 5Ghz wireless: 2-3mins Using my T-Mobile Android phone as a personal HotSpot (over 3G, I think): Download: 8.35Mbps Upload: 0.53Mbps