The UI performance decline is more drastic in "System Preferences" than in the rest of the system. It's because some of the pref panes (General, Security & Priv

The UI performance decline is more drastic in "System Preferences" than in the rest of the system. It's because some of the pref panes (General, Security & Privacy, etc..) are actually remote views and involve launching processes for security (address space separation) reasons.