Remove extra Context Menu that’s causing the right click delay on desktop. In my case Intel Graphic driver was causing trouble.
Launch Regedit (make backup first) and remove folders igfxcui & igfxDTCM
Regedit > HKEY_CLASSES_ROOT\Directory\Background\ shellex\ContextMenuHandlers >
We can do the same this with ShellExView
Look for TheDeskTopContextMenu and disable it
Restart explorer.exe to see the fix.