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Here is a video of the issue here https://www.youtube.com/watch?v=avvPNenmrj0
When i use 1920x1080 resolution which is my monitor size, there is a very noticeable delay when hovering my mouse over things in the menu. This also happens in game too with certain popups. When i change the resolution to something smaller, the game works fine.
I am running the game with Proton Experimental but i have tested it out with previous versions too. I am using no launch options.
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Try running the game in fullscreen mode.
If it defaults to borderless you can propably get it to launch in fullscreen with a launch option.
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