Currently, WebAudio will use the lowest latency possible for the audio device for the best interactive behavior. However, for some use-cases such as media playback, this causes unnecessary power and/or CPU utilization. The latencyHint is a hint from the developer that such a latency is not required. The latencyHint is either an AudioContextLatencyCategory value or a double specifying the desired numeric latency. This is a hint to Chrome.
Docs: http://webaudio.github.io/web-audio-api/#BaseAudioContext https://webaudio.github.io/web-audio-api/#idl-def-AudioContextOptions