This past weekend I managed to vastly improve the time it takes to transfer the rendered image from pylux to Blender, when using integrated rendering or for material/texture preview. I’ve also made some test tweaks to the rendering thread’s priority (Windows only), hopefully should make things more responsive on Windows.
Just to give you an idea with a 1920x1080 image, before it would take 6-8 seconds on my machine and use 750MB memory (just for the transfer!!), while now it takes about 1.2 seconds and about 60MB memory.
If anyone has had any issues with material preview crashing in Blender, or rendering of loop subdivided meshes, please download the updated builds. URL is the same, just grab them from the download page.