Solve only 80% of a problem. That's usually good enough and you'll not only get done faster, you'll actually have a chance of getting done at all.
This strategy is given by Amix in HOW TWITTER (AND FACEBOOK) SOLVE PROBLEMS PARTIALLY. The idea is solving 100% of a complex problem can be so hard and so expensive that you'll end up wasting all your bullets on a problem that could have been satisfactoraly solved in a much simpler way.
If you solve your scaling issue 100%, then you might not be working on features or other important things enough. In a startup, you just can't freaking afford the time and effort.