From 3732d7cf701ff110ac297d3010e3aeb70a4b7e83 Mon Sep 17 00:00:00 2001
From: Bruno Alves de Faria <brunoalvesdefaria@gmail.com>
Date: Sat, 20 Aug 2016 11:24:27 -0300
Subject: [PATCH] Throttling session calls due to performance issues

---
 Packages/viewerbase/lib/layoutManager.js | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Packages/viewerbase/lib/layoutManager.js b/Packages/viewerbase/lib/layoutManager.js
index 00ff9da0b..0e1b07a32 100644
--- a/Packages/viewerbase/lib/layoutManager.js
+++ b/Packages/viewerbase/lib/layoutManager.js
@@ -15,16 +15,15 @@ LayoutManager = class LayoutManager {
         this.viewportData = [];
 
         this.isZoomed = false;
+
+        const updateSessionFn = () => Tracker.afterFlush(() => Session.set('LayoutManagerUpdated', Random.id()));
+        this.updateSession = _.throttle(updateSessionFn, 300);
     }
 
     getNumberOfViewports() {
         return this.layoutProps.rows * this.layoutProps.columns;
     }
 
-    updateSession() {
-        Tracker.afterFlush(() => Session.set('LayoutManagerUpdated', Random.id()));
-    }
-
     setDefaultViewportData() {
         var numViewports = this.getNumberOfViewports();
 
@@ -216,7 +215,7 @@ LayoutManager = class LayoutManager {
             // Don't enlarge the viewport if we only have one Viewport
             // to begin with
             if (this.getNumberOfViewports() > 1) {
-                this.enlargeViewport(viewportIndex);    
+                this.enlargeViewport(viewportIndex);
             }
         }
     }