Logic 9 + Mountain Lion = Performance Problems

Hi,
After months of debating to upgrade to Mountain Lion, I did it (and regret it like iOS 6).
I'm just wondering if anyone gets the issue with Logic 9, where it works for around an hour no problems, then the CPU meter goes mental and causes glitching in the audio no matter what I/O buffer size I choose, or what sample rate my projects in, OR how many plugins/instruments I have open?
It's really starting to affect my clients as to solve the problem the OS needs a full reboot.
I am fully updated in Software Update and it worked perfectly until Mountain Lion.
Hope there is a solution!
Tim

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