Comment # 11 on bug 1112824 from Olivier Nicolas

Running GNOME on XOrg with Nvidia blob
After installing packages from comment 4 

 gjs-1.54.2-163.1.x86_64.rpm
 gnome-shell-3.30.1-393.1.x86_64.rpm
 gnome-shell-calendar-3.30.1-393.1.x86_64.rpm
 gnome-shell-lang-3.30.1-393.1.noarch.rpm
 libgjs0-1.54.2-163.1.x86_64.rpm

the performance is restored.