I remember seeing published numbers based on instrumented code, but could not find it.
I did a quick test with the Google implementation (https://github.com/google/liblc3) which is about 2x faster than Opus. To be honest, I expected a bigger difference, though it's just a superfical test.
A few things that also might be of relevance why they picked one over the other:
- suitability for DSPs
- vendor buy-in
- robustness
- protocol/framing constraints
- control
I did a quick test with the Google implementation (https://github.com/google/liblc3) which is about 2x faster than Opus. To be honest, I expected a bigger difference, though it's just a superfical test.
A few things that also might be of relevance why they picked one over the other: