https://bugs.winehq.org/show_bug.cgi?id=52960
--- Comment #8 from Henri Verbeet hverbeet@gmail.com --- I suspect a good chunk of the difference is due to WINED3D_CS_SPIN_COUNT being unreasonably large, which is something we're already aware of and should have a solution for in the near/medium term.
Fundamentally Fabian is right though; higher CPU utilisation isn't necessarily a problem if that results in better performance. FPS/frame time is one measure of that, but you'd want to look at GPU utilisation as well.