Video playback with Wayfarer8.7 is choppy or delayed, about 20 seconds plays fine and then 40 seconds plays choppy and so on. All videos play like this not just YouTube.
Wayfarer8.6 with exactly the same settings works normally.

Here is a video from my phone.
https://youtu.be/4ebqIdDfoQc

The first 2 minutes is Wayfarer8.6 (for comparison) and the second 2 minutes is Wayfarer8.7.
The behavior is the same if I use Youtube Experience Mobile or SmartTV.
It doesn't matter what the video is or its quality or length or anything like that.