Ajax username checking makes the field sluggish (https://andbang.com/register https://andbang.com/register with FF 8.0) - when I type username fast, most of the

Ajax username checking makes the field sluggish (https://andbang.com/register https://andbang.com/register with FF 8.0) - when I type username fast, most of the letters don't show at all. I believe the reason is at: register.js line 24 =)