JS micro-optimization?

gistfile1.js

// readable and easily re-orderable

$(document).on('submit', '#foo', myCallback1);
$(document).on('submit', '#bar', myCallback2);
$(document).on('click', '.baz', myCallback3);

// performant

$(document).on('submit', '#foo', myCallback1)
	.on('submit', '#bar', myCallback2)
	.on('click', '.baz', myCallback3);

// also performant

$document = $(document);
$document.on('submit', '#foo', myCallback1);
$document.on('submit', '#bar', myCallback2);
$document.on('click', '.baz', myCallback3);