Step 1: Create a single parent object for the forest and add a child particle system for moss glows. Step 2: Configure the moss emitter with a low emission rate, small size, and a blue‑ish glow material. Step 3: Add a second child system for dew drops; use a transparent, refractive material and set the lifetime to match the falling motion. Step 4: Enable GPU instancing on both systems so many particles can be drawn with a single draw call. Step 5: Use a texture atlas for the glow and drop sprites to reduce texture swaps. Step 6: Optimize by culling particles that are off‑screen or below a certain distance. Step 7: If frame rate drops, lower the max particles per system and increase the particle size so fewer particles are needed. Step 8: Profile the scene with the Unity Profiler; look at GPU and CPU times for each system. Step 9: If needed, split the forest into chunks and activate only the chunk that contains the player. Step 10: Test on target hardware and tweak emission rates or particle lifetimes until you hit the desired visual quality with acceptable performance.

Thanks for the extra pointers. I’ll first run a quick ambient fog test, then adjust the dew pulse to match the scattering. I’ll bake the moss normal map, combine the glow and drop atlases into one, and drop an unused UV set. After profiling, if the GPU still spikes, I’ll lower the maximum particles and shift to a single shader pass for the whole forest. That should keep the particles integrated and the performance in check.