When I play on stadia, the graphics often get very blurry and are only high quality if I stand still for a while. It seems that the bandwith decreases when there is not much happening on screen, which makes sense to save power. However it seems stadia is having problems with upscaling when I move around and need more data.
Other games, like Doom Eternal play perfect, with crisp graphics all the time (1440p/60). Bandwith usage here is often around 50mbit, while it can go down to >1mbit in Baldurs Gate. Usually it's 5-10mbit.
Cabled connection with 300mbit, so this should not be a problem and as I said other games look good. I expect that this is a problem on Stadias side that need fixing for BG3.
2nd issue I have may be present on pc version aswell. Some textures load in very low quality, seems to be downscaled by the gpu. This happens a lot with characters and items, which can have nearly single colored textures while the background loads full textures.