Speed up the expansion/collapsing of nodes.

[as per Thom Brown <thom@linux.com>]

Also, we will not like to wait for 500 microsecond before initialing the
tree items, load them asap.

web/pgadmin/browser/templates/browser/js/browser.js

@@ -329,6 +329,16 @@ function(require, $, _, S, Bootstrap, pgAdmin, alertify, CodeMirror) {
             if (n)
               settings.url = n.generate_url(item, 'children', d, true);
           }
+        },
+        loaderDelay: 100,
+        show: {
+          duration: 75
+        },
+        hide: {
+          duration: 75
+        },
+        view: {
+          duration: 75
         }
       });