I've discovered that the Tasharen Water system is sucking up a lot of resources on integrated graphics cards on Medium. Specifically it's dropping from 140FPS to 15FPS. Unfortunately, medium is as low as Tasharen Water can really go before it starts to look very bad.
Is there anything I could change in the shader to make it more optimized for mobile? Maybe by removing the reflections? Most importantly I'd really like to keep the shore foam, since that's what really makes the water look nice.