PlayerEndOfFrame

Hello!
I’m working on a VR project and I notice the render thread spends a lot of time in PlayerEndOfFrame (like 8-9ms for frame).
What’s the meaning of this marker?

Replying for the update. I want to know it as well.

In another thread I found someone said it’s because of the coroutines, but it seems weird to me especially because I found the marker in the render thread…