Audition 2.0 CPU load with dual core CPU in multitrack

When I use AA2.0 Multitrack in real time, both CPU Cores are used for rendering the efects and I can reach  an overall CPU load of amount 80-90%.
When I use the export meue for the Audio mixdown, the CPU load reaches only 50%, because only one core makes the whole work an the secon core makes nothing.
Is there a fault in my configuration or is this normal?
Thanks a lot
long john

Unfortunately normal - certainly for AA2.0, which was never really optimised properly. Really, 2.0 can only be regarded as a 'late beta' - an upgrade to 3.0.1 would be a good (and relatively cheap) move.

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