I need to know how much the Screen Capture actor can be worth in a patch of a four channel mixer. With as many effects as shader plug ins.
What risks can be encountered by creating a sophisticated patch with at least two screen captures that start the game, out of a total of 4 fairly robust user actors: in the first two users there are 2 captures, in the third a syphone reciver and in the fourth bu I don't know .... I have yet to decide.
my mac runs with catalina on a six core 7 processor and a ram of 16 GB, 5 GB of video card
You shouldn't have any trouble running 2 screen capture actors, especially in GPU mode.
I would recommend you install and test the plug-in to be sure, since hardware configurations often differ and can potentially change the behaviour.
I just did a quick test on my laptop pc, and capturing from 2 displays with animated content I am using ~70% LOAD in Isadora at 60fps. This tells me I could do much more before I am mxed out since the GPU isn't working very hard. It all depends on what I want to combine.