Before revision:  We analyze the processes of system boot up and shutdown on two platforms, the Raspberry Pi 3 and  Zero Wireless, and enhance duty-cycling performance by identifying and disabling time consuming or unnecessary units initialized in the userspace.
After revision:  We analyze the processes of system boot up and shutdown on two platforms, the Raspberry Pi 3 and Zero Wireless, and enhance duty-cycling performance by identifying and disabling time-consuming or unnecessary units initialized in the userspace.