(In reply to Michel Dänzer from comment #25)
> So maybe it actually depends on whether mutter uses DRI3 or DRI2? You can
> test this by enabling DRI3 on the server side but (re-)starting mutter with
> 
>  LIBGL_DRI3_DISABLE=1 mutter --replace

Yeah, result is smooth experience (and broken gnome-shell lol), I was convinced
that same bahviour happens with other WM's, I remmember when using Ubuntu that
there was same problem, but i was using custom gnome-flashback session, still
was convinced same thing happened with compiz and metacity, obviously i should
have tested it, not concluding from (erroneous) memory.

So, this is connected with mutter, and probably does not belong here but on
gnome project bug report? Latter i will try some environment variables for
clutter to investigate it further.