Gottfried Hofmann writes: Cycles has one weak point and that is rendering caustics. That’s why it makes sense to have more than one engine in your tool belt. Appleseed is both open source and production proven and it renders caustics kinda efficiently thanks to SPPM:
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from BlenderNation https://www.blendernation.com/2018/05/10/rendering-caustics-in-blender-using-the-appleseed-render-engine/