I got up early to try it out....

Running 2 (main at 1920x600 and clone(s) at 640x600) leaves my processor at 100%...

So I loaded up the other 3, and as expected was running at ~7 fps.

Then I minimized the 4 clones....

My CPU dropped down to ~90%, and I jumped up to ~40fps
I resized the main to 1920x1000, and played for a bit...

Minimizing made a HUGE difference...

Going to be a bit of a pain to do it that way, but what a difference!