When playing videos in a web browser, and sending the sound to a bluetooth speaker (amazon echo) I get playback problems; stuttering, sound quality reduction to AM radio level or lower). These things can clear up after a minute or two, or be reduced.
When playing from nvlc however I get no such problems. (I haven't tried vlc so I am not sure if it is just that it is a command line). I have tried google-chrome and firefox-esr. Perhaps there is some other browser which will work? Maybe I need to isolate the process from the browser? I tried pop-out picture on you tube and it improved but there was still stuttering.