I haven’t had this type of problem on any other platform and my friends have not experienced it either on Watch2Gether. I’ll be happy to provide any information that might be pertinent to this issue.
Thanks a lot for your feedback. I heard about this from some other users as well and will try to find the cause next week. Will update this thread when there is a fix or when i need further feedback.
I just rolled out a fix for this issue. Fullscreen should now work at full fps. Thanks for the bug report!