Give other events chance to fire.

After each complete framebufferUpdate, set a short timer to continue
processing the receive queue. This gives other events a chance to
fire. Especially important when noVNC is integrated into another
website.

include/rfb.js

@@ -1250,13 +1250,12 @@ handle_message: function () {
         RFB.disconnect();
         break;
     case 'normal':
-        while ((RFB.state === 'normal') && (RFB.RQ.length > 0)) {
+        if ((RFB.state === 'normal') && (RFB.RQ.length > 0)) {
             if (RFB.normal_msg()) {
                 // true means we can continue processing
                 Util.Debug("More data to process");
-            } else {
-                // false means we need more data
-                break;
+                // Give other events a chance to run
+                setTimeout(RFB.handle_message, 10);
             }
         }
         break;