Just updated my GOG Galaxy client to 1.2.6. The overlay feature is causing stutter when moving the camera around while walking/running in The Witcher 3. I've now disabled the feature which removed the problem.

Just a heads up and wondering if I'm the only one.

Sidenote: My FPS isn't decreased with the overlay enabled, it's only causing stutter

yep is crap, have to disable it too

Thanks for the post, I was hoping it had something to do with the update, but wasn`t sure about what exactly was causing it. This solved it :)