Every single time your prompt appears, your shell is doing something. I've tried using various prompt customising things in the past, but they've almost all been written in shell, and always been palpably slow. To the degree that I've found it irritating and stopped using them.

Starship is the first one that hasn't irritated me, in no small part because it's lightning fast, typically only couple of milliseconds to gather and render the prompt.

This is the first time I've been able to stick with one.