Will 3.4.3 work on mesh that is 400,000 polys?
We’re on 3.4.4 now, and it can work on a high poly significantly higher than that of course, but for the low poly it will struggle with drawing that many custom verts. The current workaround is to hide the areas of the mesh you’re completely finished with. In RetopoFlow 4 though, it will be able to handle that no sweat.
Also, I’ve started a dedicated thread on here for feedback and updates: RetopoFlow 4