diff --git a/static/js/index.js b/static/js/index.js
index d9e0ef7..3244827 100644
--- a/static/js/index.js
+++ b/static/js/index.js
@@ -35,13 +35,16 @@ $(function() {
     editor.getSession().setMode("ace/mode/markdown");
     editor.getSession().setUseWrapMode(true);
     editor.setShowPrintMargin(true);
-
     $.get('/slides.md', function(data) {
         editor.setValue(data, -1);
     });
-
+    var lastSRow = -1;
     ace.edit('editor').getSession().selection.on('changeCursor', function(e) {
         var cursorRow = ace.edit('editor').getCursorPosition().row;
+        if(lastSRow === cursorRow){
+          return; // no update
+        }
+        lastSRow = cursorRow;
         var currentSlide = currentCursorSlide(cursorRow);
         $('#slides-frame')[0].contentWindow.postMessage(JSON.stringify({
             method: 'slide',
diff --git a/static/js/save.js b/static/js/save.js
index 835edb1..4ed9d3e 100644
--- a/static/js/save.js
+++ b/static/js/save.js
@@ -15,5 +15,5 @@ $(function() {
     });
   };
 
-  $('#editor').keyup($.debounce(window.save, 300));
+  $('#editor').keyup($.debounce(window.save, 600));
 });