Please read my question here: https://forum.unity.com/threads/vfx-and-single-burst-spawning-millions-of-verts.1458121/
If you are practiced at using VFX Graph, hopefully you can help me with some answers. 
Please read my question here: https://forum.unity.com/threads/vfx-and-single-burst-spawning-millions-of-verts.1458121/
If you are practiced at using VFX Graph, hopefully you can help me with some answers.