Arduino nano 33 ble cost a lot of energy when powering on

When I just power the arduino nano 33 ble and it runs under the mode Board: "Arduino Mbed os nano board -> Arduino nano 33 BLE" with empty loop code, it cost a lot of energy at the begining. It seems like that MBED initialize something, anyone know how to optimize this part of energy cost?


Reproduce the power draw on an Arduino Nano 33 BLE using the Arduino Mbed OS Nano board setting and an empty loop. Compare the startup behavior with normal operation, then trace the Mbed initialization involved; done means identifying the startup cause and demonstrating a verified reduction in energy use.

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