onPartialUpdate (dc) function call...

If you use "file>watchface diagnostics" in the sim when in low power, wht do you see for the total?

Here's one of mine.  under 10ms avg:

What you can do in onPartialUpdate(), just return if the seconds aren't a multiple of 10, but I also think that will look odd.

For my application is in low power:

Are you sure you are actually in low power?  Toggle it in the Settings menu a couple times.  What device are you using?  Some, like the venu devices don't use onPartialUpdate.

Yes, I had low power mode on in the simulator.

My device is F6.

Then you're not really doing anything in onPartialUpdate.  Notice that graphics and display time is 0?. 

all i do is:

function onPartialUpdate(dc){
      sleepMode = true;
      WatchUi.requestUpdate();
      
      
    function onExitSleep() {
    	sleepMode = false;
    	requestUpdate();
    }

   
    function onEnterSleep() {
		sleepMode = true;
		requestUpdate();
    }  

You're missing a } on line 4.

You also don't seem to understand how onPartialUpdare is used.  By doing the WatchUI.requestUpdate, I can see why your battery drains.  In onPartialUpdate, you want to set a clip regions and then only update that part of the screen

See https://forums.garmin.com/developer/connect-iq/f/discussion/5156/1hz-watch-faces---q-a

Thanks, so I'm calling full screen, but I only need to call the part I want to update ...

Read the thread I linked.  I called it "1hz" at the time as this was how watch faces could update seconds every second.

So now I should have it done.

Thank you...