diff --git a/calendar/js/et2_widget_daycol.js b/calendar/js/et2_widget_daycol.js
index 86bbe1e9cb..c39b7f7972 100644
--- a/calendar/js/et2_widget_daycol.js
+++ b/calendar/js/et2_widget_daycol.js
@@ -852,6 +852,10 @@ var et2_calendar_daycol = et2_valueWidget.extend([et2_IDetachedDOM, et2_IResizea
 	 */
 	position_event: function(event)
 	{
+		// Not visible?  Skip it for speed.
+		// Should be called again as part of resize when shown.
+		if(!this.div.is(':visible')) return;
+
 		// Sort events into minimally-overlapping columns
 		var columns = this._spread_events();
 
diff --git a/calendar/js/et2_widget_event.js b/calendar/js/et2_widget_event.js
index 4e675a8bfa..475f9403f8 100644
--- a/calendar/js/et2_widget_event.js
+++ b/calendar/js/et2_widget_event.js
@@ -364,7 +364,11 @@ var et2_calendar_event = et2_valueWidget.extend([et2_IDetachedDOM],
 		this.set_statustext('');
 
 		// Height specific section
-		this._small_size();
+		// This can take an unreasonable amount of time if parent is hidden
+		if(this._parent.div.is(':visible'))
+		{
+			this._small_size();
+		}
 	},
 
 	/**