Picked up my car on 9/20; so limited experience.
However, came across this post because I'm trying to determine if my car has issues. At this point, I concur that the browser is one of the worst experiences...ever. Speed difference in comparison to iPhone (both on LTE) is ridiculous. This causes slacker and InTune to be crappy too. I listen to PodCast and that experience, due to the connectivity, is extremely frustrating.
Likewise, the car's ability to get a decent WiFi signal at home is crazy bad too.
Over the next few days, I will be using dslreports site to capture some data for review.
Additionally, I'm going to contact Tesla Support for assistance...