Bastiaan wrote up a great how-to for standalone xr performance https://forum.godotengine.org/t/performance-considerations-for-stand-alone-xr/52...
In addition to that, just try and keep the poly count low.
This will be very helpful! I found even with static baking, some light options just bog down my Quest 2. I think I could have optimized my materials better as well.
