Multi monitor frame-refresh time best practice

Just want to clarify, if I use dual screens for Vuo full screen windows, which would be my main frame time Port? Should I use either output monitor, or a fire on display refresh instead?

What is the best practice for fire on display refresh? And does it differ to the windows built in frame time output?

All Requested Frame ports, whether on Render * to Window or Fire on Display Refresh, use the screen with the window that has keyboard focus.

(Possible FR that you could create if you think it’s important: Make the Render * to Window nodes fire at the refresh rate of the screen their window is on, and give Fire on Display Refresh` a VuoScreen input port to pick where it gets its timings from.)