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Thanks, very interesting.

I've already updated my Mac Pro 8 Core but didn't tested it yet. I am curious if it affects my machine, too ! Would be very disappointing....

Are 09 Quad Cores the only machines affected yet?
 
HyperThreading can help, but it's not exactly a 2x speed up in any way. So I find those reports a little odd.
 
Fix for 9.12

Fix for 9.12.

Open terminal:

Enter this string:
defaults write com.apple.logic.pro MD_AllowVirtualCores -bool yes

Your hyperthreading is re-enabled.

On my Corei7 2.8 ghz iMac I went from 61 tracks with HT with 9.11 to a pitiful 30 tracks!

With 9.12 and the fix I went to 70 tracks!

This is using the Evan benchmark where every track has a space designer and exs1 instrument. Overkill I know. No real session would ever have that.

At any rate, there you go.
 
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