Thanks Craig,
at least or unfortunately there is no simple issue. You are not forcing a complete zone to witch at the same time and the only app I do not know, is better lights. If that identified to creating the delay, you may ask within that app.
Perhaps someone else knows more.
I would propose to extend one of the slowest with some debug information like
(Sorry for the German flow, but I hope it is clear, what i mean.)
Then you can see, if it is slow to recognise the button being pressed or the RGBW controller to react. You can even create a new flow that pushes the button. Then you can have a complete picture of the whole structure.
And then try not to push the button in the Homey App, but push the physical button to avoid any influence of the Android/IOS app.
