I somehow introduced flicker into my former 7DRL and tried three different things to get rid of it. What worked was
pausing, doing the physics updates, then unpausing which is the only way I could find to stop `_process` from running in all of the nodes, which I think does the drawing in Godot. (Drawing several jumpy updates in different frames close to each other caused the flicker, I think.) Feel kinda wrong? But I couldn't find anything more right.
Still, so far, Godot has been fairly smooth for me. Something like this would have been a nightmare in Unity or my own "engines."