[flukus]

For my own projects: Straight away to an extent. I take pride in making things work fast, within reason.

For work: I just try to avoid making things slow out of stupidity by avoiding things likes n+1 queries. On modern hardware this get's you to the "good enough" point. In enterprise software no one paying me has every cared about performance, they don't have a problem if it takes 15 seconds to load a page showing 10 items for instance, they certainly won't pay me to get that 500ms request down to 30ms.

And that's why commercial software is so slow and bloated, no one will pay a cent to make it otherwise.