Hey Guys,
So I noticed the same problem and found an ideal workaround. I used the browser feature built in the webos tv and navigated to espn and logged in. I was then able to watch my espn + content. Yes the website takes some time to load but the video content once your playing it and go to full screen showed 0% lag. Keep in mind I'm using an ethernet connection on the tv and have a 100 mbps connection. The quality was very good as well, 4k. I added a picture.