Is it possible to purposely slow down the SpriteKit scene's FPS? I was thinking if this is possible to make debugging of my game easier.
You can do something like this as well (as an addition to crashoverride777's answer) by slowing down nodes or physics:
To make nodes going into slow-mo (you can do this per node):
self.speed = 0.2 //where self is a scene
or to do the same with physics:
self.physicsWorld.speed = 0.2 //where self is a scene