Hey! I'm not sure if this game runs caped on Linux, but Momodora I does, 30 fps. I couldn't find anywhere to post this on its page, but I did find that people were having issues with fps with Momodora series, so this might still help. It took me a long time, and I still have no idea why, so hopefully it can help someone:

- How play it 60 fps with wine
What worked for me, was setting the game in momo.config.ini , that's in the game folder, to 3 and in wine, force the resolution of the screen, not the game, to specifically 1920x720. If vertical size is any different, or game size, it drops to 30 fps again.

- Why it works
I...have no idea! Well, I do, but it's a long shot. Please, if you got it working in another way, let me know!! Information on getting 60 fps was very hard to find, I would highly appreciate it. SO, my guess is... the fps counter. With the specific settings I described, the fps counter gets hidden, so maybe it doesn't need to update and the game gets lighter.
But this theory is too wild for my tastes... I'm not convinced. Other alternatives I've image are : maybe resolution is tied to a vsync? maybe it doesn't recognize some resolutions from newer systems?

If I figure out something else I update here. I hope there is no issue with this post, even though is not technically for Momodora III. I hope the mod understands, a post like this would had saved me so much time, I want the discussion to be available if possible. The origins of the Momodora series, would be nice to be preserved.