Need help with Grounded (online-fix)

Hi, I have some trouble with running Grounded (the cracked version from online-fix) on Crossover: It is absolutely unplayable with dx12, and I get 5fps when I force dx11 in steam command line (tested with d3dmetal, msync and with adding the online-fix libraries and mscoree.dll in wine configuration). Given that everyone on reddit gets 50-60fps on Grounded, I suspect that the problem is that I am not running the official steam version, so there's some dependency/compatibility problem that I don't know how to resolve. Could someone help me? It would be awesome and helpful for other people. I'm open to dms. Tysm <3