Duplicated materials

I’m posting this video because I have some issue with rhino materials.

1 - when I copy/paste an object from a project with some large textures to another project, time to copy/paste is unbelievable.
2 - I’m trying to copy a single object with a simple material but when I paste it on another project, Rhino copies many other materials.

I’m using the last version of rhino6, the last version of octane render and win 7
My graphic card is a gtx 1080 ti and my chipset is Ryzen 7
I have 32 gb of ram