Updating all citations every time a new one is inserted?

Is Endnote supposed to go through the entire document scanning, collecting, and updating in-text citations **every time** a new reference is inserted?  If so, is there a way to still be able to “Insert Selected Citation(s)” from the Endnote Toolbar in Word,  but NOT have it go through the whole document like this every time?

Endnote X4

Word for Mac 2011


if you want them automatically updated, it seems to.  I turn off autoformating (so the refs appear as {Author, Year #rec no})  I prefer this for a multitude of reasons – who really needs to see the refs in the final format?  - Alternatively turning off the html linking option can make the auto-updating less sluggish too.