During the last Lost Ark stream on Twitch, CM Roxx confirmed the availability of DirectX11 for all players on launch day (February 8th):
DirectX11 will bring great performance improvements to the game. These will be particularly noticeable y populated areas and cutscenes. In addition to shorter loading times in general.
This update has come really quick to our version of Lost Ark. It was initially released on Korean servers in December 2021. These benchmarks illustrate the real impact of DirectX11: