Hi- I have a 2011 MBP on my desk upstairs, while my router is downstairs. I noticed that the internet speed, via speedtest, is much slower upstairs but I figured that was because of the distance from the router. Today I did a speed test both upstairs and downstairs where the laptop sits and it's virtually the same speed. However, when I plug in my external monitor the speed drops from 25Mbps to 6 Mbps. Any ideas? Thanks.