Hi, I've see a large drop in HEVC encoding throughput when migrating from libva 1.7.3 / i965 1.7.3 SKL / VA-API 0.39.4 (which were the defaults in Debian 9 Stretch) to more the recent libva 2.4.0 / i965 2.3.0 SKL / VA-API 1.5. I could previously encode 9x streams of 1080p30, now I can encode 3x streams of 1080p30. (I also see higher quality output at lower bitrates, which is a very good thing!) Is the drop in encoding throughput due to quality improvements in the drivers? If so, are there options I can change to explore the trade-off between quality and throughput? None of the options exposed through ffmpeg with hevc_vaapi seem to have a very large impact on throughput. Or is there a chance that something is configured incorrectly? I have tried encoding with both i965 and iHD drivers. I have tried using ffmpeg with both libmfx / hevc_qsv and vaapi / hevc_vaapi. I have tried running on Debian 9 and Ubuntu 19.04. I have tried running on SKL (E3-1505M) and CFL (E-2176M). In all cases I see roughly similar maximum thoughput. The only other 'symptom' I have been able to find is that with the old libva / VA-API, intel_gpu_top reported "render space: 0/16384" while the newer version reports "render space: 0/4096". Any insight into this would be appreciated! Andy Knowles