Currently Being ModeratedNov 26, 2012 7:46 AM (in response to gaggy)
First thing to do is update Logic (using Software Update, or download the updater manually from the Apple Support Download page.
Second, to help with CPU spikes, go to Preferences:Audio and adjust the I/O buffer to maximnum (assuming you have finished recording). Thsi would give higher latency, but will reduce the CPU load.
3rd: consider wether you can use less cpu-intensive plugins, or bounce in place, or freeze tracks to reduce the CPU load.
If you are getting 'low memory' messages, first, restart the Mac without any additional programs running. This will free up RAM.
If none of that helps....