BURN A TRACK including effects

We don't call that 'burning' - that's a term generally used for creating CDs. In terms of applying effects and reducing processing power requirements, Audition can do better than that; it's a process called pre-rendering. At the top of the effects rack is a little lightning bolt -

and if you click that, it apply all the effects in the rack to your track, so it's fully processed before the mix - so it doesn't now have to be processed during a mixdown or export at all. And you can do it independently to any track in your session. The reason that it's better though is that you can unclick it, change things around, and then pre-render the whole thing again without loss. Win-win, that is!