diff --git a/CHANGELOG.md b/CHANGELOG.md
index aba7a5e..c18cbac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 1.7.1 (October 24, 2022)
+* code optimization
+
 # 1.7.0 (April 25, 2022)
 * 64 colors support
 
diff --git a/manifest.xml b/manifest.xml
index ce3aaf1..505a9f1 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -1,5 +1,5 @@
 <!-- This is a generated file. It is highly recommended that you DO NOT edit this file. --><iq:manifest xmlns:iq="http://www.garmin.com/xml/connectiq" version="3">
-    <iq:application entry="SmartArcsApp" id="2eafd80f81794ced90db35ccfcb29945" launcherIcon="@Drawables.LauncherIcon" minSdkVersion="3.0.0" name="@Strings.AppName" type="watchface" version="1.7.20">
+    <iq:application entry="SmartArcsApp" id="f9b0f982693411e9a9231681be663d3e" launcherIcon="@Drawables.LauncherIcon" minSdkVersion="3.0.0" name="@Strings.AppName" type="watchface" version="1.7.1">
         <iq:products>
             <iq:product id="approachs62"/>
             <iq:product id="d2air"/>
diff --git a/manifest.xml.beta b/manifest.xml.beta
index 7a497e4..6868481 100644
--- a/manifest.xml.beta
+++ b/manifest.xml.beta
@@ -1,5 +1,5 @@
 <!-- This is a generated file. It is highly recommended that you DO NOT edit this file. --><iq:manifest xmlns:iq="http://www.garmin.com/xml/connectiq" version="3">
-    <iq:application entry="SmartArcsApp" id="2eafd80f81794ced90db35ccfcb29945" launcherIcon="@Drawables.LauncherIcon" minSdkVersion="3.0.0" name="@Strings.AppName" type="watchface" version="1.7.2">
+    <iq:application entry="SmartArcsApp" id="2eafd80f81794ced90db35ccfcb29945" launcherIcon="@Drawables.LauncherIcon" minSdkVersion="3.0.0" name="@Strings.AppName" type="watchface" version="1.7.26">
         <iq:products>
             <iq:product id="approachs62"/>
             <iq:product id="d2air"/>
diff --git a/manifest.xml.prod b/manifest.xml.prod
index 9417c70..505a9f1 100644
--- a/manifest.xml.prod
+++ b/manifest.xml.prod
@@ -1,5 +1,5 @@
 <!-- This is a generated file. It is highly recommended that you DO NOT edit this file. --><iq:manifest xmlns:iq="http://www.garmin.com/xml/connectiq" version="3">
-    <iq:application entry="SmartArcsApp" id="f9b0f982693411e9a9231681be663d3e" launcherIcon="@Drawables.LauncherIcon" minSdkVersion="3.0.0" name="@Strings.AppName" type="watchface" version="1.7.0">
+    <iq:application entry="SmartArcsApp" id="f9b0f982693411e9a9231681be663d3e" launcherIcon="@Drawables.LauncherIcon" minSdkVersion="3.0.0" name="@Strings.AppName" type="watchface" version="1.7.1">
         <iq:products>
             <iq:product id="approachs62"/>
             <iq:product id="d2air"/>
diff --git a/resources/settings/properties.xml b/resources/settings/properties.xml
index 655234f..bc95957 100644
--- a/resources/settings/properties.xml
+++ b/resources/settings/properties.xml
@@ -64,8 +64,6 @@
         <property id="dateFormat" type="number">1</property>
         <property id="dateColor" type="number">0xAAAAAA</property>
 
-        <property id="arcsStyle" type="number">1</property>
-
         <property id="hrColor" type="number">-999</property>
         <property id="hrRefreshInterval" type="number">3</property>
         
@@ -208,10 +206,6 @@
 
         <string id="off">- Off -</string>
 
-        <string id="arcsStyle">Indicators style</string>
-        <string id="arcsDecent">Classic</string>
-        <string id="arcsExtravagant">Extravagant (experimental)</string>
-
         <string id="hrColor">Heart rate color (off or color)</string>
         <string id="hrRefreshInterval">Heart rate refresh interval (seconds)</string>
         <string id="hr1">1</string>
@@ -612,13 +606,6 @@
             </settingConfig>
         </setting>
 
-        <setting propertyKey="@Properties.arcsStyle" title="@Strings.arcsStyle">
-            <settingConfig type="list">
-                <listEntry value="1">@Strings.arcsDecent</listEntry>
-                <listEntry value="2">@Strings.arcsExtravagant</listEntry>
-            </settingConfig>
-        </setting>
-
         <setting propertyKey="@Properties.oneColor" title="@Strings.oneColor">
             <settingConfig type="list">
                 <listEntry value="-999">@Strings.off</listEntry>
diff --git a/source/SmartArcsView.mc b/source/SmartArcsView.mc
index 1e502b7..7fecd87 100644
--- a/source/SmartArcsView.mc
+++ b/source/SmartArcsView.mc
@@ -34,12 +34,12 @@ class SmartArcsView extends WatchUi.WatchFace {
 
     //global variables
     var isAwake = false;
+    var partialUpdatesAllowed = false;
     var curClip;
     var fullScreenRefresh;
     var offscreenBuffer;
     var offSettingFlag = -999;
     var font = Graphics.FONT_TINY;
-    var needComputeConstants;
     var lastMeasuredHR;
     var powerSaverDrawn = false;
     var sunArcsOffset;
@@ -117,9 +117,7 @@ class SmartArcsView extends WatchUi.WatchFace {
     var sunsetColor;
 
     function initialize() {
-        loadUserSettings();
         WatchFace.initialize();
-        fullScreenRefresh = true;
     }
 
     //load resources here
@@ -136,6 +134,12 @@ class SmartArcsView extends WatchUi.WatchFace {
             offscreenBuffer = null;
         }
 
+        partialUpdatesAllowed = (Toybox.WatchUi.WatchFace has :onPartialUpdate);
+        loadUserSettings();
+        computeConstants(dc);
+		computeSunConstants();
+        fullScreenRefresh = true;
+
         curClip = null;
     }
 
@@ -161,13 +165,8 @@ class SmartArcsView extends WatchUi.WatchFace {
 
         var deviceSettings = System.getDeviceSettings();
 
-        //compute what does not need to be computed on each update
-        if (needComputeConstants) {
-            computeConstants(dc);
-        }
-
-		//recompute sunrise/sunset constants every hour - to address new location when traveling
 		if (clockTime.min == 0) {
+    		//recompute sunrise/sunset constants every hour - to address new location when traveling
 			computeSunConstants();
             //not needed to get date on every refresh event
             dateInfo = Gregorian.info(Time.today(), Time.FORMAT_MEDIUM);
@@ -235,7 +234,9 @@ class SmartArcsView extends WatchUi.WatchFace {
             }
         }
 
-    	drawSun(targetDc);
+        if (locationLatitude != offSettingFlag) {
+    	    drawSun(targetDc);
+        }
 
         if (ticks != null) {
             drawTicks(targetDc);
@@ -284,7 +285,7 @@ class SmartArcsView extends WatchUi.WatchFace {
             return;
         }
 
-        if ((Toybox.WatchUi.WatchFace has :onPartialUpdate) && (hrColor != offSettingFlag || showSecondHand == 2)) {
+        if (partialUpdatesAllowed && (hrColor != offSettingFlag || showSecondHand == 2)) {
             onPartialUpdate(dc);
         }
 
@@ -414,9 +415,6 @@ class SmartArcsView extends WatchUi.WatchFace {
 		locationLatitude = app.getProperty("locationLatitude");
 		locationLongitude = app.getProperty("locationLongitude");
         
-        //ensure that constants will be pre-computed
-        needComputeConstants = true;
-        
         //ensure that screen will be refreshed when settings are changed 
     	powerSaverDrawn = false;   	
     }
@@ -490,11 +488,6 @@ class SmartArcsView extends WatchUi.WatchFace {
         }
 
         dateInfo = Gregorian.info(Time.today(), Time.FORMAT_MEDIUM);
-
-		computeSunConstants();
-
-        //constants pre-computed, doesn't need to be computed again
-        needComputeConstants = false;
     }
 
     function parsePowerSaverTime(time) {
@@ -1030,7 +1023,7 @@ class SmartArcsView extends WatchUi.WatchFace {
         dc.setPenWidth(7);
 
         //draw sunrise
-        if (sunriseColor != offSettingFlag && locationLatitude != offSettingFlag) {
+        if (sunriseColor != offSettingFlag) {
 	        dc.setColor(sunriseColor, Graphics.COLOR_TRANSPARENT);
 	        if (sunriseStartAngle > sunriseEndAngle) {
 				dc.drawArc(screenRadius, screenRadius, screenRadius - 17, Graphics.ARC_CLOCKWISE, sunriseStartAngle, sunriseEndAngle);
@@ -1040,7 +1033,7 @@ class SmartArcsView extends WatchUi.WatchFace {
 		}
 
         //draw sunset
-        if (sunsetColor != offSettingFlag && locationLatitude != offSettingFlag) {
+        if (sunsetColor != offSettingFlag) {
 	        dc.setColor(sunsetColor, Graphics.COLOR_TRANSPARENT);
 	        if (sunsetStartAngle > sunsetEndAngle) {
 				dc.drawArc(screenRadius, screenRadius, screenRadius - sunArcsOffset, Graphics.ARC_CLOCKWISE, sunsetStartAngle, sunsetEndAngle);