Tesla performs horribly on Laguna Lap, but so do all the American Muscle cars. You basically need a low-weight car with high acceleration to do well.
Other raceway times are also interesting. But that's what I look for in high-performance cars.
That website also has links by car (to see how a particular car does across different racetracks). The Tesla P85D page is here:
http://fastestlaps.com/cars/tesla_model_s_p85d.html
Not very many runs yet, but we can get a glimpse of how it is doing from the four tracks listed.
They take very tight corners. I'd imagine that the turn-intensive tracks would be where these smaller cars would do better. Their acceleration leaves a bit to be desired (but what do you expect for $25k?). 0-60 in 6.3 seconds is still reasonably sporty.
Fiesta is too small for my tastes, but I did go with a Focus (non-ST... just normal stock Focus) for my vehicle. For a manual vehicle, its perfectly fine.
From 4000 through 6500 RPM, you can definitely feel the little engine work. Turbo must kick in or something.
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In any case, its amusing to see "just" the ST models do decently on these tracks. After all, people who actually want performance go for the RS model.
The point is there are other metrics than 0-60, and in fact 0-60 is --- at least within a given bracket of cars --- a pretty cheap metric to optimize.