Thanks, I used the Halo video[0] to compare, a couple of notes. - Youtube seems to have limited the AV1 support to 1080p, 1440/2160p are not available, anyone any idea why? - The load on my CPU (MB Pro 2018 quad-core/ FF DE 67.0b9) seems about the same but I do seem to be dropping significantly less frames, not sure though.

[0] https://www.youtube.com/watch?v=Fmdb-KmlzD8&list=PLyqf6gJt7K...