Z Sort System Action Question

I was wondering if Z sort is affected at all by conditions?

Like if I put a condition that tests if object A is on the screen, will the Z sort action only affect object A's that are on screen and ignore the rest?

Yes, like most actions it only affects the picked instances.

OK thanks. I knew there were some actions unaffected by conditions, so I wanted to make sure I wasn't just wasting processing time on conditions that do nothing. lol