This was improved in Planet Zoo as water is now an actual physical thing, so this should end up in Planet Coaster 2. Planet Coaster’s water effects are quite notorious since water in the game is actually a silhouette layer instead of, well, water. If Frontier repeats the same mistake, that’s going to be a major deficit for the overall reception of the game. This is a must have for Planet Coaster 2. These kinds of things really hinder players who want to go big in their builds, especially those with less capable PCs. The more guests walking around in your park, the more the game has a hard time.
When facing any object that generates particle effects, the frames take a hit. The biggest frame-killers are particle effects and park guests. This game is quite notorious for having rather underwhelming optimization that even the most capable of PCs have a hard time running the game when parks are filled to the brim with objects.