why my cpu stuck at 2.96 ghz, even doing nothing, its frustrating

[Octa]

Please tell us some basic information before asking for help:
Model Name:
Firmware Version:
Rooted or not:
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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[ronald1985]

Ellenbaugh

https://zentalk.asus.com/en/discussion/comment/138792#Comment_138792

How do you go about logging your phone to see what apps are using cpu

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Enabling Developer Options
If you don't have developer options, do the following:
On your phone, go to Settings - About phone - Software information
Tap Build number at least 5 times (it will show number of taps left as you are tapping on the screen)
Go back to Settings - System
You will now see Developer Options

XDA has a nice guide in doing the installation:
How to quickly install and use ADBAfter performing the installation steps, type in: ./adb.exe shell top
This will show you the usage of cpu ordered by the highest first.