Game seems to have switched from DX9 to DX11

I've been noticing my game has been having an increased bouts of random unresponsiveness that has nearly taken over my game play time after the last update or two.

Today I noticed my game isn't running DX9 like it was last I'm aware of. I'm not sure when it switched over, just that I've just now noticed it has. Would this potentially be why I'm now encountering this increase of unresponsivness in my game?