And here we go again! So, friend of mine had same problem. That first solution i posted above didn't work. So i try to dig more. And i found that Divinity have pretty big saves files. Atleast for him, at end he had 600Mb/349Mb in steam storage. I believe that cause nonstop rewriting, and then slows a game and cause a shuttering. After unclicking steam cloud save, and then deleting them in My Documents (In Larian studios/Divinity Original Sin 2/PlayerProfiles/>name</savegames), just keeping last one's do a trick. Game for him run like charm now. So i believe that with steam cloud on, you have to limit yourself just with per savegames at a time.
