Hacker News Reader

Best advice I ever got on the topic was "Just don't be stupid, reasonable solutions tend to scale idiotic ones don't."

Which basically boils down to don't worry about performance in the +/- 50% range, worry about performance when you are going to see x^3 or +/- 5,000%.

Scaling from 10 to 1000 is quite likely early on, though above 1000 I'd say the rule would apply.

Good point. Would have just said 2 order of magnitudes instead (20 users, scaling to 2000).