While libaom is the "reference" implementation, it isn't always the fastest. Enter (Scalable Video Technology), originally developed by Intel and Netflix.
Scalable Video Technology for VP9 (SVT-VP9): A Challenger to libvpx in Multi-core Encoding Why: Intel’s SVT-VP9 is a direct challenger to libvpx (both encode VP9). Shows 4–6x speedup on many cores with similar BD-rate. Source: Proceedings of the 12th ACM Multimedia Systems Conference (2021) – “SVT-VP9: A real-time VP9 encoder for many-core systems.”
Our optimized libvpx implementation achieves significant performance improvements over the baseline: