Comment # 56 on bug 1112824 from Dead Mozay

In general, everything that I tried, does not help, rebuild the kernel without
patches, compile the kernel from appstrim, disable spectre, rebuild
gnome-shell, gjs, xorg, mesa, mutter, try kernel-vanilla, it all partially
solved the problem, but still not as it should be. The best option is disable
Hyper threading, only on my laptop I have no such opportunity, on my PC it is
possible,. installed openSUSE Leap, with enabled Hyper threading the problem is
there (GNOME 3.26). Installed Fedora, GNOME works perfectly, despite being
turned Hyper threading or not. I have no more ideas.