>I try to keep many interactions and animations to 0.25 seconds. That seems the slowest "acceptable" time for interruptions. I like the way old desktop UIs use

>I try to keep many interactions and animations to 0.25 seconds. That seems the slowest "acceptable" time for interruptions. I like the way old desktop UIs used to work: the action happened immediately, but there was also a fast animation that acknowledged it. Like, minimizing caused the window to disappear instantly, but there was also the wireframe rectangle that quickly shrank into the taskbar over the following few frames. The animation didn't interrupt user flow at all!