In a hobby desktop app, I show a splash screen before the UI is fully loaded. After optimizing startup time, it's now at a point where a hot start is very fast, less than 300 ms, to the point that you can't really read anything on the splash screen. Cold start still takes a second or so.

Is there a best practice here? At which point do you stop showing a splash screen? I've seen applications where the splash screen lingers even after the UI is loaded, which seems weird to me and gets in the way of getting things done.