Question, what is your average preview update time ? (like changing a string in the preview how much time does it take to update)

it takes about 5 seconds.

I would say, “not fast”

Definitely slow, especially when compared to flutter's hot reload, but then of course, we can't make that comparison, hot reload is powered by Dart

mine is more 20s (on a high end compute, 3900x, but on Windows) might come from that then