Small titles...

Hey guys. I'm looking at making a load of fairly large trigger boxes to dot around skyrim. When I say fairly large, think perhaps half the size of Whiterun. These will just have an OnTriggerEnter() script that displays a notification on player entry, nothing more. Maybe an Enable()/Disable() on something, but that's literally it.

What sort of optimisation overhead am I looking at here? Say I place 20/30 of them here and there. Is it something I should be thinking/worrying about?