Hello.
See 3 images:
-PT (path tracing) kernel at 4M samples per pixel (= 4 laps of regions picked bottom of 1MS/px)
-PT with denoiser (same MS/px) - look highlights
-new Photon Tracing kernel with denoiser at 515 S/px but no any variable caustics (less than 0.3 roughness ground)
We don't want any blur nor any invisible for caustics for PT kernel but AI denoiser improved for caustics in next version of OR.