This is my first time posting in this section of MacRumors. Usually I just read around but this problem has been driving me nuts. This is my third MacBook that I've owned, and the best. My first one was a late 2008 Pro. Worked great but was bulky. Sold that for a 2010 Air 13". Loved that one as well but MacOS Sierra slowed it down (only 2 GB of RAM). Sold that for my current 2012 Air 11" (4 GB of RAM). I love this one even more but there's one problem.... internet speeds! I ruled out channel congestion. We pay for 24 Mbps speeds and I'm only seeing 1-5 on my MacBook. Prior to changing my router to a channel that works better, I couldn't even load a speed test half the time. When I could, I could barely get 0.5 Mbps. Web pages loaded really slowly. Now, webpages seem to load faster but not as fast as I'm used to. With both channels, other devices did very well with internet speeds. Both iPhones and the Apple TV connected to my router all pull 20+ download speeds. I talked to Apple Care but they want me to send it in for repair... they didn't seem to be of much help anyway. I am not all that experienced with diagnostics when it comes to MacOS, so I'm not sure what exactly to do. Any suggestions?