@Bob Bugzilla: I’m not sure glxgears can be considered as a proper benchmark…

Anyway, I think it’s really unlikely an issue on your Nvidia card affects the
performances of your Intel one, which is what you’re currently saying.

Also, are you sure this issue is new? What did you have before? Because AFAIR,
I had this for as long as
https://bugzilla.freedesktop.org/show_bug.cgi?id=70354 has been solved, and
prior to that, well…