If like me you regularly access System Preferences to change settings then the following tip may help you open System Preferences quicker.
Open System Preferences using Keyboard Shortcuts:
On your keyboard use ALT + F2, which opens up the Display system pane. Then use CMD + L, which will change from the Display system pane to the main System Preferences.
Open System Preferences using Spotlight:
On your keyboard use CMD + SPACE to display the Spotlight search (top-right menubar) where you can simply type the keyword sys which should then display and select System Preferences, and then hit the RETURN key to open.