Rain Water
This will only happen with Eevee and is normal!
These nodes have extensive networks within them and so Eevee will take some time to compile shaders. Exactly how long it will take will depend on the hardware in use.
Yes, they will! The entire system is highly optimized so will not only work well for Eevee renders, but can even play in real time at 15-30 fps depending on scene complexity and hardware.
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rain bfcm23 rainy splash procedural texture lake procedural material procedural shader rainwater nodesetup summer22 nodesetups procedural weather fx winter24 rain-water nodes Water loveblender spring21 wet puddle pond bfcm21 bcon22 river weather raindrop procedural materials procedural-rain summer23 summer21 spring22 bfcm22 spring24 Shader procedural-water spring23