Apple does respond....slowly. When FCPX was dumbed down. They smartened it up. When battery life took a dive with ML....well....it's a little better now. Still waiting for OSX 11.0 Putty Tat.
Background render disabling in FCPX Preferences:
http://www.premiumbeat.com/blog/selective-rendering-in-final-cut-pro-x/
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