You are looking at the wrong thing, what you need to do is start up your games and then check the latency in them, almost all online games have a tool built-in to check that. What you are looking at based on your speed, is the connection from your computer to the Router, which is not where the lag is from. The lag comes from the Router to whatever game servers you are using. This can change based on if you are downloading anything, if anyone else in the house is using the internet, if sunspots are a bit too active, the internet is a flowing thing. If you are lagging NOW this second, but are fine in a bit, that's normal. If you are lagging all of the time, check your internet connection speed and ping rates.
It may seem like your recieved packets are jealous of your sent packets because there are so many more of them, but that's not the case. Don't worry about send/recieve stats unless one or both at at 0.