optimus is not prime and if you run blender on your internal amd don’t wonder that it sucks.
also: if you expect better information then you have to bring up better information. minimum is the famous inxi-output that is the minimum basic information ! this thread is wasted time unless you come up with better infos.
As sugested here (Reverse Prime - Legion 5) I installed Optimus-Manager in order to switch between hybrid and discrete modes. I just said that as an additional info, never said that optimus is the same thing as prime.
As I said above, Im not running Blender in my internal, and yes on Nvidia card (using prime-run blender), and that works well (it does not suck). The problem is that, sometimes, screen tearing may appear.