diff --git a/js/function.js b/js/function.js
index c2d3c36..f2a13bd 100644
--- a/js/function.js
+++ b/js/function.js
@@ -11,20 +11,30 @@
 
 	/* Sticky Header */	
 	if($('.active-sticky-header').length){
-		$window.on('resize', function(){
-			setHeaderHeight();
-		});
+		var $headerSticky = $('header .header-sticky');
+		var $headerMain = $("header.main-header");
+		var cachedHeight = 0;
 
 		function setHeaderHeight(){
-	 		$("header.main-header").css("height", $('header .header-sticky').outerHeight());
+			cachedHeight = $headerSticky.outerHeight();
+	 		$headerMain.css("height", cachedHeight);
 		}	
-	
-		$window.on("scroll", function() {
-			var fromTop = $(window).scrollTop();
+
+		$window.on('load resize', function(){
 			setHeaderHeight();
-			var headerHeight = $('header .header-sticky').outerHeight()
-			$("header .header-sticky").toggleClass("hide", (fromTop > headerHeight + 100));
-			$("header .header-sticky").toggleClass("active", (fromTop > 600));
+		});
+	
+		var ticking = false;
+		$window.on("scroll", function() {
+			if (!ticking) {
+				window.requestAnimationFrame(function() {
+					var fromTop = $window.scrollTop();
+					$headerSticky.toggleClass("hide", (fromTop > cachedHeight + 100));
+					$headerSticky.toggleClass("active", (fromTop > 600));
+					ticking = false;
+				});
+				ticking = true;
+			}
 		});
 	}