Performance of jQuery Selectors with ID

Question

I know in jQuery if we use ID to select elements,it\'s so efficient.I have a question about this selectors:

please consider this 3 selectors:

Answer 1

The fastest will be:

  $('#Mytbl', '#MytblContainer' );    

because in this case, jquery don't have to search the whole dom tree to find '#Mytbl'. It will search in the scope given only. IE it will serach in '#MytblContainer' only .