[sanitycheck]

> For the vast majority of any task that requires writing code, performance is the least of your concerns;

Maybe, but it's perhaps not as rare as you think.

My main current project exists because development of the previous version was aborted after a year due to fundamental technology/architecture choices which it turned out would never achieve sufficient performance on the target devices.

Yesterday I was handed someone elses Android app to debug, it turns out to take 8 minutes for each (incremental!) compile for some reason. That's a performance problem which hugely slows down development.

A couple of years ago I wrote a moderately complicated one-way sync script to take data from one system and feed it into another. I had to artificially limit number of requests per minute to about 200 because apparently otherwise I was putting "massive load" on the target system causing it to auto-scale up several times. This was mostly GETs which the occasional small POST/PUT. Something very wrong there!