Amazingly high CPU - version 8 OS X

Hi guys,

This is on a 12 core MacPro trash can with 32gb ram and a UAD Apollo.

This problem is there with other interfaces as well, I have tried a FF800 and the internal audio, same terrible performance.

Cubase with no project loaded uses around 80% CPU, with a single track with Diva using the default patch it uses 210% CPU.

The equivalent figures in Logic X are around 2% and 18%.

Any ideas what might be going wrong?