Does disabling the steam cloud save in the steam properties help? I have steam cloud disabled for all games but you can do it for each game individually as well. I still get the "waiting for cross save" pop up when exiting out of the game but I don't think it's actually doing anything as I don't actually have to wait and can just close it and exit out.
It's Larian built-in crosssave system, independent from downloading platform. They have it on DOS2. There is an option to disable it, but it's not working which is annoying.
