A recent post discussed this but I didn't bother to copy from the web link I provided where they told us how it could be used to leverage more cores. My view and method here is to never duplicate web content. It's part of saving my time and not cluttering the board with ready web content.

Specifically the article told how dual cores were taxed well and with more you could run another instance of Fritz to explore other short term moves while the main copy crunched along.