Question Occasional performance spike caused by "DXGI:WaitOnSwapChain"(wait for target fps)

My game runs smoothly at 60fps. Vsync is enabled.
But there is an occasional performance spike.
I profile the build and it says it is caused by "DXGI:WaitOnSwapChain"(wait for target fps).
How can I fix it?

 

I don't think I can disable vsync because it looks ugly, the render behaves strangely

 

Hey. I have the similar question.
That what I find about this:
https://issuetracker.unity3d.com/issues/dxgi-dot-waitonswapchain-causes-lower-fps-when-in-player

https://forum.unity.com/threads/performance-spikes-due-to-dxgi-waitonswapchain.1109306/

But I did not solved problem until now.