Merge branch 'performance-improvement-debounce-redraw' of https://github.com/guillaume/iD into guillaume-performance-improvement-debounce-redraw

modules/renderer/map.js

@@ -266,8 +266,6 @@ export function rendererMap(context) {
     function redraw(difference, extent) {
         if (!surface || !redrawEnabled) return;
 
-        clearTimeout(timeoutId);
-
         // If we are in the middle of a zoom/pan, we can't do differenced redraws.
         // It would result in artifacts where differenced entities are redrawn with
         // one transform and unchanged entities with another.
@@ -302,10 +300,7 @@ export function rendererMap(context) {
     }
 
 
-    var timeoutId;
-    function queueRedraw() {
-        timeoutId = setTimeout(function() { redraw(); }, 750);
-    }
+    var queueRedraw = _.debounce(redraw, 750);
 
 
     function pointLocation(p) {