We just tested, in the Game picture mode the output from the TV speakers is ~22ms slower than the video, while out of game mode (the Custom picture mode was tested) the TV speakers were ~25ms slower when a 60fps video signal was input (such as video games), and ~47ms slower when a 24fps video was input (such as a movie). All of these sync delays are below noticeable thresholds according to the sources listed here
. The 'Clear Audio+' setting had no effect on audio sync lag. It's possible other sound configurations (ex passthrough to an external receiver) could have different audio sync. There's no way to change the audio sync for non-Bluetooth sources.