Optimizing jQuery

Try to not select on classes only

// Slow
$('.class');
// Fast
$('div.class');
// Or
$('#id.class');

Selector chaining

// Slow
$('div').css('background','blue');
$('div').text('This is a text');
$('div').append('Hello world!');

// Fast
$('div').css('background','blue').text('This is a text').append('Hello world!')