The game only ever seems to run at the default 40 FPS for me. Changing any of the settings in "config.lcl" file, which includes "game rate 40 fps", does nothing.
I'm having the same exact problem, guess it's not a recent thing at least. Hopefully now after the announcement of the new Divinity game, the first game will get some more attention and someone will come up with a fix for the locked framerate.