I went to the shop today to check their display LG OLEDs. B9 had exactly the same lag, C9 was slightly better, still more than 100mls. Just play some av sync video on youtube and record in slow-mo on your phone. You'll clearly see the lag. I've made the same test for arguments sake on my laptop and there's 0 lag, perfect sync. Given other threads here on reddit regarding this issue I believe this is WebOS problem. I guess people just don't care or are not bothered about it. Unfortunately I am. Deals for B9 are too good now, won't get anything OLED for this price. Just gonna use Shield or Apple TV. Still I'm at a loss how has that not been fixed yet. It's a constant delay, how hard is it implement video hold for 100 mls to sync it up.