I already used HeliconFocus version 8.2.7 and it is not fixed.

Thanks @phil_soon . Tried rendering with TIFF files instead of DNGs and it is really more than 10times faster. Retouching still slow as h*ll. (M2 MAX).

Agree, retouching is insanely slow. "Running" it on a M2 Max (38 Core GPU). Will wait to buy until it's fixed.

Maybe port it to Apple Silicon and replace OpenCL with Metal?