I don't know, but that's what I want to figure out by reading about their bluetooth specs. Obviously Espressif didn't write their own bluetooth spec, they are going by the classic bluetooth spec that all other devices use. When you use classic bluetooth to stream audio from a pc to a speaker, if it had that kind of latency, you wouldn't be able to synch the audio with the video, and the high quality audio has a lot higher data packets than my mere 300 bits every 9 ms. So I don't think bluetooth is designed with that kind of latency in the specs, otherwise it would be useless. Why are you so adamant about it being the limitng factor, instead trying to figure out if maybe some other factor is the cause? Do you know 100% it can't be done any faster?