Question about custom watchface battery consumption

Hi all,

I'm pretty worried about the battery of my VivoActive 4 (lasting about 3 days at most, without doing activities). Yes, I've done some things to alleviate that (no notifications, no SpO2, low brightness), and I wanted to create the simplest possible watchface, showing only hours and minutes, and with no partial updates.

My question is, even with this very basic IQ watchface, ¿will battery consumption be worse than default garmin ones? This is the furthest I've managed to go:

This is a profile of 20secs of the watchface, between a minute (e.g. the 20 secs are within the same minute)

And this is some of the code (but only drawing hours and minutes, no date). As you can see, I've commented out a version with WatchUi views, founding it spending about 10% more time on the whole OnUpdate.

    
import Toybox.Graphics;
import Toybox.WatchUi;
import Toybox.Time.Gregorian;

class ShyView extends WatchUi.WatchFace {

    private var _timeFont as FontResource?;
    private var _dateFont as FontResource?;
    private var _height;
    private var _width;
    private var _centerX;
    private var _centerY;
    private var _dateAlreadyCalculated;
    private var _stringHours;
    private var _stringMinutes;
    private var _stringTime;
    private var _stringDateTop;
    private var _stringDateBottom;
    hidden var _tvTime;
    hidden var _tvDateTop;
    hidden var _tvDateBottom;

    function initialize() {
        WatchFace.initialize();
        _dateAlreadyCalculated = false;

        // Load resources
        _timeFont = WatchUi.loadResource($.Rez.Fonts.id_font_fjalla_large) as FontResource;
        _dateFont = WatchUi.loadResource($.Rez.Fonts.id_font_fjalla_small) as FontResource;
    }

    function onSettingsChanged() {
        // No settings
    }

    function onLayout(dc) {
        setLayout(Rez.Layouts.WatchFace(dc));

        // Dimensions
        _width = dc.getWidth();
        _height = dc.getHeight();
        _centerX = _width / 2;
        _centerY = _height / 2;
    }
 /*
    function onShow() {
        _tvTime = new WatchUi.Text({
            :text=>_stringTime,
            :color=>Graphics.COLOR_WHITE,
            :font=>_timeFont,
            :locX =>WatchUi.LAYOUT_HALIGN_CENTER,
            :locY=>WatchUi.LAYOUT_VALIGN_CENTER
        });
        _tvDateTop = new WatchUi.Text({
            :text=>_stringDateTop,
            :color=>Graphics.COLOR_WHITE,
            :font=>_dateFont,
            :locX =>WatchUi.LAYOUT_HALIGN_CENTER,
            :locY=>40
        });
        _tvDateBottom = new WatchUi.Text({
            :text=>_stringDateBottom,
            :color=>Graphics.COLOR_WHITE,
            :font=>_dateFont,
            :locX =>WatchUi.LAYOUT_HALIGN_CENTER,
            :locY=>_height - 40
        });
    }
    */


    // Update the view
    public function onUpdate(dc as Dc) as Void {
        // Call the parent onUpdate function to redraw the layout
        //View.onUpdate(dc);

        // Same color for all
        dc.setColor(Graphics.COLOR_LT_GRAY, Graphics.COLOR_BLACK);
        dc.clear();

        // Draw the UI
        var clockTime = System.getClockTime();
        calculateTime(clockTime);
        drawHoursMinutes(dc);
        calculateDate(clockTime);
        drawDate(dc);     
    }

    private function drawHoursMinutes(dc) {
        //_tvTime.setText(_stringTime);
        //_tvTime.draw(dc);

        // Draw hours
        //dc.setColor(Graphics.COLOR_RED, Graphics.COLOR_TRANSPARENT);
        dc.drawText(
            _centerX - 4,
            _centerY - 12,
            _timeFont,
            _stringHours,
            Graphics.TEXT_JUSTIFY_RIGHT | Graphics.TEXT_JUSTIFY_VCENTER
        );

        // Draw minutes
        dc.drawText(
            _centerX + 4,
            _centerY - 12,
            _timeFont,
            _stringMinutes,
            Graphics.TEXT_JUSTIFY_LEFT | Graphics.TEXT_JUSTIFY_VCENTER
        );
        
    }

    private function drawDate(dc) {
        //dc.setColor(Graphics.COLOR_LT_GRAY, Graphics.COLOR_TRANSPARENT);

        //_tvDateTop.setText(_stringDateTop);
        //_tvDateBottom.setText(_stringDateBottom);
        //_tvDateTop.draw(dc);
        //_tvDateBottom.draw(dc);

        // Top part of the date
        dc.drawText(
            _centerX,
            24,
            _dateFont,
            _stringDateTop,
            Graphics.TEXT_JUSTIFY_CENTER | Graphics.TEXT_JUSTIFY_VCENTER
        );

        dc.drawText(
            _centerX,
            _height - 32,
            _dateFont,
            _stringDateBottom,
            Graphics.TEXT_JUSTIFY_CENTER | Graphics.TEXT_JUSTIFY_VCENTER
        );
        
    }

    private function calculateTime(clockTime) {
        var hours = clockTime.hour;
        var minutes = clockTime.min;
        if (clockTime.min < 11) {
            minutes = clockTime.min.format("%02d");
        }
        _stringHours = hours;
        _stringMinutes = minutes;
        _stringTime = hours + "" + minutes;
    }

    private function calculateDate(clockTime) {
        if (!_dateAlreadyCalculated || clockTime.min == 1) {
            var now = Time.now();
            var date = Gregorian.info(now, Time.FORMAT_MEDIUM);
            _stringDateTop = Lang.format("$1$", [date.day_of_week]);
            _stringDateTop = _stringDateTop.toUpper();
            _stringDateBottom = Lang.format("$1$ $2$", [date.day, date.month]);
            _stringDateBottom = _stringDateBottom.toUpper();

            _dateAlreadyCalculated = true;
        }
    }
}