The problem for Tesla, and anyone who bid up its stock Tuesday afternoon, is that it has already pushed investors’ horizons out so far, in the interest of raising more capital, that even going beyond “ludicrous speed” on its flagship car doesn’t get pulses racing. If your CEO has spent months and months talking about a new mass-market vehicle, home batteries, buying SolarCity, electric trucks and robo-taxis, then cutting that zero-to-60 lag by 3 tenths of a second seems rather humdrum.