https://bugs.winehq.org/show_bug.cgi?id=23993
--- Comment #13 from Patrick McMunn doctorwhoguy@gmail.com --- I did a little digging and testing. I found a Wine plugin called d9vk which is now part of a more comprehensive plugin called dxvk which is a Directx 9/10/11 -> Vulkan translation layer for Wine. Since the game doesn't have a built-in FPS meter, this is purely subjective, but the performance I now see with this game is much more comparable to native Windows performance. If it's not completely on par, it is very close. And from what I've read online, the problem seems to lie in the DX9 shader compiler functionality of Wine. So this isn't so much a game-specific bug as a general deficiency in Wine's DX9 compatibility. Until this compatibility improves, I'd recommend the dxvk plugin for anyone dealing with performance problems with this game under Wine.