Cpu overloading in 64 bit mode logic 9

Hey
I have a IMAC i3 3.06 with 12g of ram. Some songs overload the computer especially 2 of them and those songs consist of 5 apple instruments and no fx. Kinda odd right? I changed my buffer size to 1024 from 64 and it kinda helped. Logic is running 64 bit mode (I unchecked open in 32 bit and 64 bit show when loading logic).

No, I don't think it's odd. Software Instruments are the most CPU intensive. Also, different instruments have different processing requirements, even if you don't have any other FX in the chain.
I've got a top of the line MacBook Pro, and I have songs that start to bog down at 5 SI in GarageBand so I just lock those tracks. I just got Logic Pro so I don't know what the equivalent is here; I don't know if you can "lock" tracks, or if you just bounce them to an Audio track.
But I'd say basically, it doesn't seem that odd to me that you'd have a performance bottleneck on that iMac. Also, for playback, as opposed to recording, larger buffers are better. I'd stick with 1024 or higher.

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