I didn’t develop on it, but I’ve used recently one app written in it and it was hot pile of garbage.
It was slow as a slug, and eat lot of CPU. I’ve also checked web eversion and was astonished as it rendered everything into canvas. It’s really poor design choice to render everything by app itself.
I guess it was just buggy app, but I didn’t try other apps in flutter, so can’t compare.
But web demo of flutter UI components with list box was also not so fast. But perhaps it’s just web version. Didn’t know any example of good flutter app.