As a practical matter, the most powerful Porsches and Teslas are both going to be hitting the traction control pretty constantly during hard acceleration from a stop. Their performance changes on racing slicks, I'm sure. A gt2 RS on racing slicks recently did less than ten seconds for the quarter mile with some minimal modifications at a drag strip. (Which is a crazy use for that car, but still)

It's a measure of how amazing the Tesla's performance is that you need something with race car-like specs to compete. On the other hand, that only holds true for about the first quarter mile. It's not going to keep pulling hard until 200mph. The roadster will, perhaps, someday.