How to check/show/log DX11 performances versus DX9 performances?

Hi all, I have the feeling my GW2 running worse with DX11 than DX9 (so I'm still using DX9), as title, how I can check in real time and log some data about performances? I suppose something to show FPS, I'm using -maploadinfo to show loading times but I would like to have something to check and compare when I have time to do that. Thanks