Adobe's Todd Kopriva posted the link to a recording of the recent webinar on optimizing for performance for Premiere Pro & After Effects. Todd also provides addition links to relevant resources supporting this update on tweaking performance.

There's bound to be some redundancy but there a few other related video tutorials, like Understanding Memory and Multiprocessing by Won Novalis here on AEtuts+ ('blessed' by Todd in AE Help) and Setting Up After Effects for Optimum Performance with 64-Bit Systems by Todd Kopriva from Adobe After Effects CS5: Learn by Video: