under ideal conditions, I am having 10ms latency for browser audio "recording".
this does not take into account internet/network, just local.
it is not very stable at that, often being at 20ms and at worse 40ms.
I dont think it is possible to go lower than this for the inputs.

now, from my tests before the playback latency is usually much lower, but still have to find a good way for this in native code and no more python...