Not entirely sure why you're complaining about the stock speed of the Tesla. A stock speed of 95mph is enough to outrun most police cruisers as well as having the additional benefit of not needing to refuel which, in some circumstances, significantly benefits you.
Additionally, the Tesla double upgraded increases the top speed to 110mph to outrun pretty much all police vehicles and accelerates much quicker than even a few super cars. (Despite how it requires an additional $2 million to gain these benefits)
But overall the stock speed, coupled with the factor of fueling up the car removed, is something that you shouldn't worry about.