As susject: there is a way to clean or purge materials that have inside node not assigned.
I have a lot of old materials (made in Octane 2.x) that seen in Node Editor have huge node (image textures, etc) not assigned, as you can see in this example:
So first question is : could give problems: increasing time of render, memory occupation, etc?
Second question is there is a chance to purge all the materials in one step?
Thanks a lot.
Luca