Merge pull request #860 from denisvmedia/master

Calling resize on each and every window resize drammatically slows down the browser

src/config.js

@@ -7,6 +7,7 @@ c3_chart_internal_fn.getDefaultConfig = function () {
         padding_right: undefined,
         padding_top: undefined,
         padding_bottom: undefined,
+        resize_auto: true,
         zoom_enabled: false,
         zoom_extent: undefined,
         zoom_privileged: false,

src/core.js

@@ -324,12 +324,20 @@ c3_chart_internal_fn.initWithData = function (data) {
         window.onresize = $$.generateResize();
     }
     if (window.onresize.add) {
+        var timeout;
         window.onresize.add(function () {
             config.onresize.call($$);
         });
+        if (config.resize_auto) {
             window.onresize.add(function () {
+                if (timeout !== undefined) {
+                    clearTimeout(timeout);
+                }
+                timeout = setTimeout(function () {
                     $$.api.flush();
+                }, 100);
             });
+        }
         window.onresize.add(function () {
             config.onresized.call($$);
         });