In that case, I'm sorry to report that the stuttery performance I saw in Vulkan doesn't seem to happen with DX11
It's a long shot, but I had lots of problems with DX11 in early access due to the Windows 11 DVR that went away after I disabled it, though what I'd been seeing prior to that was extremely low frame rates (like <10 FPS) rather than crashing.
No dice. The game stuttering and FPS drops are nonexistent with DX11 as you said, but I'm still unable to use it (CTD after 5 minutes). I attempted your suggestion and many others online, but it seems the AMD 7000 series GPUs don't work with DX11 on Baldurs Gate. Hopefully a hotfix patches the FPS drops, because this last patch made the game essentially unplayable (or at least enjoyable) for me.
Edit: I wish I could rollback to patch 3 on Steam. I'm worried they leave it in this state or worse and I'm left with a bricked game basically.