Thank you for your long and detailed reply, but this is not in accordance with my findings. I did a simple test, I compared a DR project (with H264, HEVC, and even DNG timelapses) with iMacPro without iGPU and iMac19,1 with iGPU. The export time on iMacPro1,1 was ~18 minutes, on iMac19,1 it was ~24 minutes. Furthermore, DR shows you the export fps, on iMP I got ~55 fps, on iM19,1 I got 30-40. Maybe this is because I didn't put the iGPU in headless mode correctly (I just left my monitor connected to the VEGA). But this is some real life experience that might be worth sharing. I'm up for more testing to further sort this out, because DR performance is the main objective for my build.