[rules-users] column binding vs field binding - any performance implications?

Hi, I wonder if there are any performance implications of choosing column binding vs field binding (I'll be using bound variable in eval). Eg, in such case: Record($field : field) eval ( $field.equals("xxx") ) vs $r: Record() eval ( $r.field.equals("xxx") ) Does it start to make difference only when some significant number of variable get bound? Thanks, Vlad