Mac rendering in background

[brute4c]

Hello,
I have rather annoying problem. I'm not able to leave a rendering task running in the background because in a minute or so, when I'm switching to other application, rendering seems to be paused and CPU usage is dropping. I need to get back to SH3D in order to get the focus back, then CPU is allocated again. Note that even if I leave a SH3D on focused on first plan, but without any activity, it will also somehow pause the rendering. I'm need to move the cursor to avoid it :-/

Anyone had a similar problem? I would expect that is some optimization from OS, but I really need to disable it.

This is how it looks like in Activity Monitor:

[jegweb]

I am experiencing the same issue (also on macOS)!

So when the rendering takes a lot of time, I need to disable the computer's sleep mode and make sure that the rendering window has the focus.

It would be nice if the rendering task could not be paused by the system.