When streaming live TV from Xfinity,com on my Mac, there is an audio lag. I have tried two browsers, Safari and Chrome. Both have a significant audio lag. I could not find anything related to audio in the menu options within the Xfinity video player.
The audio is not delayed while watching content on YouTube or Netflix in both Safari and Chrome.
Version: 70.0.3538.110 (Official Build) (64-bit)