[rojobuffalo]

The problem is that performance and reliability are issues that creep up and by the time they're a problem, they are much more expensive to fix than if they had been first class priorities from the outset. Everyone who didn't care before finds new reasons to put it off because now it's so expensive to address.

[jiggawatts]

Performance issues are also often trivial to head off from the beginning but require a rewrite to remediate later.

To everyone that argues that premature optimisation is bad, that’s like saying we should go to the Moon by building a bus and then fixing any performance issues that prevent orbital insertion after it is moving down the highway successfully.