https://devzone.nordicsemi.com/f/nordic-q-a/46823/sdk-15-2-to-sdk-15-3-migration-bug-in-freertosWhen we ported our FreeRTOS based project to SDK 15.3 from 15.2, we noticed a big jump in the CPU Usage. It turned out that the issue was in SDK 15.3&#39;s freertos port_cmsis_systick.c. In SDK 15.2, the use of sd_app_evt_wait() for sleeping was disableden-USTelligent Community 13Mon, 13 May 2019 15:00:57 GMThttps://devzone.nordicsemi.com/thread/186776?ContentTypeID=1Mon, 13 May 2019 15:00:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6997c533-f0fa-4db8-8ab6-7fe66cb47f13kirkus<p>I noticed the same thing on my project with 15.3, and when I implemented an FPU_IRQHandler as mentioned&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/12433/fpu-divide-by-0-and-high-current-consumption" rel="noopener noreferrer" target="_blank">here</a>, my CPU usage and power consumption dropped significantly.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/185051?ContentTypeID=1Fri, 03 May 2019 07:38:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0d496b95-c37e-4cb4-9077-156431e117f6Susheel Nuguru<p>Hi,</p> <p>I have not noticed this myself, thanks for letting me know. If the __WFE works fine for you, then please use that instead of the sd_app_evt_wait.&nbsp; I think this revert was not intentional.</p><div style="clear:both;"></div>