You already did it on the Thargoid maelstorm. Will the cloudy planet make the game laggy?
Yeah but not quite right, as these titan clouds are not spatial stable (they change visualy, while the observer moves around the cloud)
Because of the precision of the underlaying perlin noise to generate the effect. In order to generate a spatial space which is stable and animates over time and cast shadows down to the ground, you need quite more than the cobra engine can handle at the moment i'm afraid
If you want more information on how cloud tech works please take a look here [LINk]https://www.wedesoft.de/software/2023/05/03/volumetric-clouds/[/LINK]