My latest bad experience was whatever version fluffychat used last December, thst was the most recent time I've tried to make a web app work for me. Before that, every version of Flutter I've tried myself, both in debug and release builds. The UI is stuttery and unresponsive in a way that's not happening in mobile platforms, although even on desktop platforms I find the latency rather high. That also includes some rather small Flutter desktop+web applications I've written myself.

It seems like Flutter apps run better in Chrome, but I'm on Firefox. Could be a Flutter optimisation issue or something in Flutter triggering a Firefox bug. Whatever it is, it's making me avoid Flutter web apps.