When you are using a laptop CPU scaling helps you to save power on batteries or give you better performance when connected to AC power.
Just add the applet to some of your gnome panels and change the permissions of file /usr/bin/cpufreq-selector with this command:
sudo chmod +s /usr/bin/cpufreq-selector
Then you will get this icon showing you the processor speed...
Clicking over it you can choose the best profile to use.
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