https://bugs.freedesktop.org/show_bug.cgi?id=81045
--- Comment #8 from Michel Dänzer michel@daenzer.net --- (In reply to famo from comment #7)
However - there is some severe and very annoying stuttering. Which I can also replicate on games using that engine... Can someone else confirm?
Yes, it's because of shader recompiles. This is being addressed and will hopefully be fixed before too long. It's not related to this bug report though.