Android adb is using too much cpu

The cause of the constant CPU usage could be the sound. If you do not need sound in your emulator you can disable it by editing the AVD's config file.

Change/add those two lines

hw.audioInput=no
hw.audioOutput=no

Update: As buncis commented you can also try to disable GPS if not needed:

hw.GPS = no 

On Linux/Mac the file is located at ~/.android/avd/<AVD_Name>.avd/config.ini
On Windows the file is located at C:\Users\<username>\.android\avd\<AVD_Name>.avd\config.ini

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