Is it possible to render caustics (without crutches, like in luxrender) on the GPU?

Question

3D rendering

I join blender cycles, and as one of its few shortcomings, the inability to render caustics is given, without tricky imitations, unlike luxrender, but the latter produces caustics, it seems, only with methods / algorithms that work on the CPU - is there any render systems that draw caustics on the GPU? The question is critical in the sense that rendering on the GPU is faster (I don’t dare to say whether it’s better).
ps: if I understand correctly, "honest" caustics in luxrender come out thanks to the so-called metropolis sampling, a smarter distribution of virtual rays.

Answer 1

Rendering of caustics is possible.
But. Cycles is not physically based rendering and it's all wildly slow, even on the GPU.
Here is an indicative comparison - 5 minutes of Thea Render and 2.5 hours of Cycles render. I suspect that Cycles was working on the CPU, but still, even on the GPU, the noise goes away extremely slowly.