Pb of CPU use under PT10 with Retina
This is possibly disk IO related, even recording to the ssd disk drive. Even though it works for many if us you are still not really supposed to record to the system drive. Even is an SSD, and things like VI samples on that drive might push things over the edge--although I see you are not running any plugins, but just confirm you have no VIs in use.
Have you done all the systems optimizations for this Mac? Listed under the "Help us help you---read this before posting" link on this DUC web page.
What are the make/model/rpm specs of the USB 3 disk drives? if decent specs (7200 rpm or faster or SSD, and not a variable rpm "green" drive) you can try recording to them since you already own them. Otherwise you will need to look at a second I internal drive kit (replacing the SuperDrive) or a Firewire 800 or Thunderbolt drive. What is the *exact* model of the MacBook?
Are there any third party plugins is installed (even if not used)? Was this a brand new first time PT install ? If not did the old install work OK? If there was a previous install you use the uninstaller with "clean" option before installing 10.3.3.
Darryl
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