I've been looking in to this MSDN article: https://msdn.microsoft.com/en-us/library/windows/desktop/ms684247%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396

I've found the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Low Latency

Has a REG_SZ called Latency Sensitive, I would like to know what the effects of enabling or disabling this key are.
And why it is not enabled in other latency sensitive profiles like games, audio and pro audio.

Hi,

As I understanding, this key just help us to enable the Latency sensitive feature to let CPU to deal with tasks more efficently, so that you will have good and smooth expierence when using Windows. This key is for all tasks under System profile.

We can use the perfomance monitor to see in details when enable or disable Latency Sensitive. You can use Windows Performance Monitor to examine how programs you run affect your computer's performance, both in real time and by collecting log data for later analysis.

https://technet.microsoft.com/en-us/library/cc749249.aspx