I fixed my Android Auto lag and the cause was embarrassingly simple

You might think Android Auto is just an app that runs on your car's screen. It's actually an interface projected from your phone onto the dashboard. My app used to lag a lot before I realized that the cause was more on my phone than on the vehicle I was using or just a wireless signal. Once I started focusing on my phone instead of messing with the settings on my car, the interface became so much faster.