Here is answer I got today from developer:
"We certainly apologize for the inconvenience. This is definitely something we are currently addressing with our developers. The issue is directly related to the GPU performance since we've previously had several issues caused by powerful GPUs. I just want you to know that we totally understand the importance regarding the use of GPU acceleration. Which is why our developers are working around the clock in order to make Duet compatible hardware acceleration of many sorts. This task is quite strenuous, but our team is doing everything to make this work. Unfortunately, we don't have an ETA for the implementation of a proper solution for this matter.
For the time being, I'm afraid all we can do is ask for your patience on this matter until it is resolved. We truly apologize."