Decides whether to use analytics after the analytics API has been given a chance to load.

index.html

@@ -242,17 +242,5 @@
             <a id="feedbackButton" data-container="body" data-toggle="popover" data-placement="right" data-i18n="[data-content]feedback"><i class="fa fa-heart"></i></a>
         </div>
     </div>
-    <script type="text/javascript">
-      if (!config.disableThirdPartyRequests) {
-        [
-          'analytics.js?v=1'
-        ].forEach(function(extSrc) {
-          var extScript = document.createElement('script');
-          extScript.src = extSrc;
-          extScript.async = false;
-          document.head.appendChild(extScript);
-        });
-      }
-    </script>
   </body>
 </html>

modules/statistics/AnalyticsAdapter.js

@@ -1,19 +1,46 @@
-class NoopAnalytics {
-  sendEvent () {}
+/* global config JitsiMeetJS */
+
+// Load the integration of a third-party analytics API such as Google Analytics.
+// Since we cannot guarantee the quality of the third-party service (e.g. their
+// server may take noticeably long time to respond), it is in our best interest
+// (in the sense that the intergration of the analytics API is important to us
+// but not enough to allow it to prevent people from joining a conference) to
+// download the API asynchronously. Additionally, Google Analytics will download
+// its implementation asynchronously anyway so it makes sense to append the
+// loading on our side rather than prepend it.
+if (config.disableThirdPartyRequests !== true) {
+    JitsiMeetJS.util.ScriptUtil.loadScript(
+            'analytics.js?v=1',
+            /* async */ true,
+            /* prepend */ false);
 }
 
-const AnalyticsImpl = window.Analytics || NoopAnalytics;
+class NoopAnalytics {
+    sendEvent () {}
+}
+
+// XXX Since we asynchronously load the integration of the analytics API and the
+// analytics API may asynchronously load its implementation (e.g. Google
+// Analytics), we cannot make the decision with respect to which analytics
+// implementation we will use here and we have to postpone it i.e. we will make
+// a lazy decision.
 
 class AnalyticsAdapter {
-  constructor () {
-    this.analytics = new AnalyticsImpl();
-  }
+    constructor () {
+    }
 
-  sendEvent (...args) {
-    try {
-      this.analytics.sendEvent(...args);
-    } catch (ignored) {}
-  }
+    sendEvent (...args) {
+        var a = this.analytics;
+
+        if (a === null || typeof a === 'undefined') {
+            var AnalyticsImpl = window.Analytics || NoopAnalytics;
+
+            this.analytics = a = new AnalyticsImpl();
+        }
+        try {
+            a.sendEvent(...args);
+        } catch (ignored) {}
+    }
 }
 
 export default new AnalyticsAdapter();