[flukus]

90% of developers are working in languages where you can't really do much about cache misses, or doing so will at least involve some very non-idiomatic code. If you can't do much about the problem it's not really helpful to be thinking about it much.

[0xbear]

I don't disagree. And for 90% of them worrying about cache locality or branch mispredictions on a daily basis would be a waste of time. It's fine to deliberately ignore such concerns. It's somewhat less fine to know absolutely nothing about how programs are actually executed, and what makes them go fast.