Hi, I had the same problem and found a solution. Try changing DirectX12 to DirectX11 in your project — it fixed everything for me. But then I wondered about the cause. In my case, I always have an FPS monitor running in the background. When I closed it and switched back to DirectX12, I didn’t experience any lag or 15 FPS drops. The 15 FPS issue happens only when the FPS monitor is running. I just added the editor to the blacklist in the FPS monitor, and that solved it.