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RE: DELL INSPIRON 7567 FPS drop when unplugged

The system switches to lower power mode on battery - while you can adjust this setting in power management, it will reduce the battery runtime (and it's unlikely the battery can supply enough power to allow the system to run as fast as on AC power even if you max out the settings).

When the system is working hard, it generates heat that must be dissipated.  That causes the fan to run faster -- and be noisier as a result, just as your car's engine gets louder when revved faster.

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