AudioContext.baseLatency

The baseLatency read-only property of the AudioContext interface returns a double that represents the number of seconds of processing latency incurred by the AudioContext passing the audio from the AudioDestinationNode to the audio subsystem.

You can request a certain latency during construction time with the latencyHint option but the browser may ignore the option.

var baseLatency = audioCtx.baseLatency;

//default latency ("interactive")
const audioCtx1 = new AudioContext();
console.log(audioCtx1.baseLatency);//0.01

//higher latency ("playback")
const audioCtx2 = new AudioContext({ latencyHint: 'playback' });
console.log(audioCtx2.baseLatency);//0.02