I’ve found out that FVE 4+ actually takes a break from processing when you activate another tab in the same window. As soon as you activate the main tab again it probably continues it’s processing.
You can have it working hidden. You just have to leave the main tab active in the window it’s in. Then you just need to open a new Chrome window if you want to do other things like playing a game.
I’ll of course try to fix this but for now this tip is the best I can do.