Why does logic need to be "warmed up"?

Whenever I start logic pro 7.1.1 and load up my most recent song, I always have to go through a series of core overloads. Most of my softsynths ( I typically use around 25 ) are EXS24 samples, and it seems as though whenever I load up an instrument I have a huge spike in CPU when a new note is played for the first time, and then it plays fine after that. The problem is when I load up a song and press play, I have to go through an annoying and tedious series of core overloads every time a new note is played until logic cashes all of the notes and I can actualy get to work. Is there any settings that I should change so logic will play the song the first time?
My core audio settings
256mb buffer
larger disk buffer
medium process buffer range
power book g4 1.5ghz 512mb ram logic 7.1.1 pro

512mb ram
That's problem #1
larger disk buffer
Not a good idea, in view of your low RAM.
Are you using an external drive for your projects?
Having said that, I know this has been mentioned here before, so you might want to search for EXS24+missing notes. I think it was iSchwartz that had a theory about this - but I know that even with plenty of memory it seems that Logic needs its pump primed sometimes.

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Why does logic need to be "warmed up"?

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