Running the portable through Wine.
After about 20 seconds of downloading zkmenu : stable it informs me that the download of zkmenu : stable had failed.
OK
I can play it through Steam but on my Linux/Mint box I get 20-25fps with Steam in the background.
When I went through Wine with the Zero-K Semi-Portable (about a month ago) I got 35-40fps. I suspect it's your ver.82 of the semi-portable that was updated 26-28 of September, 2021.
Please issue a fix for this? Thank you!