Please look at this example
http://code.reloado.com/iyibaf/edit#preview. It loads 600 nodes quickly. Loading in batch mode is more faster. Please call 'loadData' method to load batch data. If you have to call 'append' method, please append multiple nodes at a time instead of single node.
$('#tt').tree('append', {
parent: selected.target,
data: [{
id: 23,
text: 'node23'
},{
text: 'node24',
state: 'closed',
children: [{
text: 'node241'
},{
text: 'node242'
}]
}]
});