I have no fear that they will artificially limit the quickness of the Model 3 in software. If it is slower than the S, it will be because of the requirements of the design - battery, wiring, motors, etc - that it needs to achieve high volume and keep costs down. It's all academic for me anyway; I will be getting the largest battery for range but I have no interest in a high-performance Ludicrous variant. Even the bargain-basement stock version will be far quicker than anything I've ever owned, and I have no desire to race anyone.