[jQuery] $.live and performance

[jQuery] $.live and performance


Hello.
Sorry about my grammar, English isn't my tang.
I want to understand how the "$(selector).live()" works.
I have a DOM with a lot of elements.
So if I write:
$('span[attr=value]').live('click')..
When jQuery search for this SPAN?
jQuery search immediately for all span[attr=value], or every time
that I click on any element jQuery check if it span[att=value]?