This is how it looks like in my version of Rhino
The plugin does not support lights from Rhino, it utilizes Sun or HDR
It is strange that this model is slow, it seems like a lest than 10000 polygons.
The plugin should be able to handle up to 2M Polygons on Quest, 20M+ on PC
I the plugin did not work for you sure you should uninstall it, but here is an example of demo kitchen done in SimLab VR