There is disclosed a system and method executable in a wireless mobile communication device for dynamically configuring processing speed for a main processor in the device during device initialization. In an embodiment, the method comprises: initiating a boot-rom procedure; determining whether a battery is present in the device, and in response to the presence of the battery, determining whether the battery charge level is above a predetermined threshold; determining whether a USB connection to the device is present, and in response to the presence of a USB connection, enumerating the USB connection; and wherein, in response to the presence of the battery and the battery charge level being above a predetermined threshold, or in response to the USB connection being enumerated at a higher current, the processing speed of the main processor is increased.