Comment 6 for bug 1937127

The issue has always existed. But with such a sharp edge between smooth and stuttering any slightest change in the GUI can push it over the edge. Also a little annoyingly, as we optimize more code it can sometimes make the problem *worse* as the GPU becomes less loaded and less likely to up-clock to smoothness.

Triple buffering is really the only solution that works with all drivers. Although sometimes you can tweak the graphics driver to change its clock scaling behaviour, I don't know if there's a more elegant workaround possible for Intel.