Nodes not rendering

I made s a bunch of stuff in the node editor and when I hook up a viewer it looks great.
However when I hook up composite and render, the blurs and effects are not applied.

How do I fix this? (Also how do I stop an emitter from rendering).

Can anyone help me?

Emitter visibility -
Concerning the rest of the bunch - you’re the one who knows. We have to look for a crystal ball ;).