Best advice I've ever been given when programming:
make it work, then make it work fast.
Premature optimisation is harmful
@Elizafox yeah but anyways (getting my train of thought back on track) that is very similar to advice I was given when I got into engineering:
It is much more important to make it work RIGHT than to make it work FAST.
Which is why deterministic/hard-realtime systems are often slower than systems that are not. #priorities