Use onstorage event - don't poll. Increase screenshot frequency to one second.

guacamole/src/main/webapp/scripts/history.js

@@ -132,6 +132,9 @@ GuacamoleHistory = new (function() {
      */
     this.onchange = null;
 
+    // Reload when modified
+    window.addEventListener("storage", guac_history.reload);
+
     // Initial load
     guac_history.reload();
 

guacamole/src/main/webapp/scripts/interface.js

@@ -418,9 +418,8 @@ GuacamoleUI.attach = function(guac) {
                 if (GuacamoleUI.sessionState.getProperty("clipboard"))
                     guac.setClipboard(GuacamoleUI.sessionState.getProperty("clipboard"));
 
-                // Regularly update screenshot if storage available
-                if (localStorage)
-                    window.setInterval(updateThumbnail, 5000);
+                // Regularly update screenshot
+                window.setInterval(updateThumbnail, 1000);
 
                 break;
 

guacamole/src/main/webapp/scripts/root-ui.js

@@ -323,12 +323,6 @@ GuacamoleRootUI.reset = function() {
     GuacamoleRootUI.views.login.style.display = "none";
     GuacamoleRootUI.views.connections.style.display = "";
 
-    // Reload history every 5 seconds
-    window.setInterval(GuacamoleHistory.reload, 5000);
-
-    // Reload history when focus gained
-    window.onfocus = GuacamoleHistory.reload;
-
 };
 
 GuacamoleHistory.onchange = function(id, old_entry, new_entry) {

guacamole/src/main/webapp/scripts/session.js

@@ -98,12 +98,9 @@ function GuacamoleSessionState() {
      */
     this.onchange = null;
 
-    // Reload properties every second
-    window.setInterval(guac_state.reload, 1000);
+    // Reload when modified
+    window.addEventListener("storage", guac_state.reload);
 
-    // Reload properties when focus is gained
-    window.addEventListener("focus", guac_state.reload);
-    
     // Initial load
     guac_state.reload();