How are you testing? Is that dav1d 1.0? 8bit or 10bit content?
If you tested before 1.0 and 10bit content, you should run it again, since we pushed new optimizations for this.
I should have included in the original comment this machines needs 60% to 70% CPU to play VP9 on similar bitrate / bit / frames. i.e Decoding on VP9 and AV1 are on a similar level of CPU usage. Considering the complexity of AV1, I thought this was an incredible achievement. ( It actually blows my mind this can be done )
I tested it on with 8 and 10 bit content the result aren't that much different. ( This is just eyeballing CPU usage in Activity Monitor ) The 3.3 Ghz was turbo, so it really should be 2.9Ghz Dual Core Broadwell CPU.