Logic 9.1.5 CPU Spike question.

Hello,

moemoe has just posted in the Logic 9 forum of Logic Users Group under the title of Logic 9.1.5 CPU Spike question.

This thread is located at http://www.logic-users-group.com/forums/showthread.php?t=5293

Here is the message that has just been posted:
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Hi guys I got some serious issues here. I know that this topic has been discussed a lot already but I think my issues are somewhat different. I got a MacPro 2x2,8 Quad Xeon with 10 Gb of  800Mhz DDR2 Ram running the latest Leopard and Lion on two different Harddisks. Working on recent projects I constantly came across CPU spikes on core8 in the Logic System Usage Window leading to crackleNoise & DropOuts on both systems. Always thought that it might have to do with Plugins like Trilian, Kontakt Libraries etc... Now I decided to do a test and I loaded like 8 to 10 instances of The EXSPiano Hall Preset and let each  play a four note chord progression simultaneously. 7 of the 8 cores go spiking red 1 (Nr 7) is almost never active (same on SL & Lion)

then I went to my Macbook 13. 2.4GHz Intel Core 2 Duo, 4Gb 1067Mhz Ram running Lion and did the same - surprisingly the Dualcore CPU can handle like 12-14 instances without spiking. 

what´s going on with my Mac Pro? Any Ideas Thank´s in advance.
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