It's true that you rarely have to work fast because the world will leave you behind otherwise (though that has occasionally been the case with startups we've funded). The reason you have to work fast is that your initial idea is probably wrong, and you have to iterate till you get it right.
Plus you are probably in the process of running out of money and how long you get to tackle the problem(s) has more to do with cash flow than the state of the world.
