Why does isolating a long sequence improve performance dramatically?

I have been editing a 30 minute episode for a reality-action show, for which I built a fast cut sequence with lots of effects and multiclips. By the time I got to compiling the show from shorter sequences I experienced a dramatic slowdown in editing. Autosaving cost me up to 20 seconds every ten minutes (I decided against the tempting option to set longer autosave-intervals). And copying + pasting single clips took way too long and invoked spinning balls.
I started to wonder: why is my dual 2.3 Ghz processor G5 with 4,5 Gb of RAM ghasping for air from editing a 30 minute show when people already cut feature films on Apple G4's? Maybe (I thought) I have processes in the background handicapping my Mac, too many plugins possibly, or maybe the project is just too large.
In order to elimate a possible culprit I started experimenting and I found that copying the long sequence to a new project makes everything fast again. Even with both the large and the slim project open side by side. Project size went down from 160 Mb to 29 Mb also, which explains the swift autosaves that I get.
But why is copy and paste now so much faster? No more spinning balls, I can hammer away on my master sequence like I want it. However I cannot acces my source material directly anymore.
For that (and to experiment further) I also copied the master clips to the test project. That slowed everything down again. So I quickly trashed everything again, except the long sequence: STILL slow copy+paste and spinning balls. Huh?
Isn't that funny? Apparently it is not lack of memory that slows me down. It must be the spiderweb of connections with affiliate clips built by FCP that hampers my sequence. By copying the sequence I break those connections, only the links with Quicktime media remain. By adding the masterclips I seem to recreate the spiderweb again, and removing the masterclips doesn't remove the invisible spiderweb. Does that make sense?
Who can explain to me what is really going on here? I have been editing on FCP since 1999, and am really puzzled by this. Why can't I keep this project flying the way it should on a screaming monster like my G5. Don't tell me it is outdated just because we now have Mac Pro's. Because I'm talking about basic editing here, not rendering effects or exporting to disk.
Thanks for your time!
Arnoud Kwant

Sequences soak up RAM. Many open sequences soak up even more. Use as few as possible at a time in the Timeline window. The larger the number of edits and durations, and multiclips and effects you've done, the more RAM it takes up. You're hitting the limit sounds like, that's why the slowdown. It's disk caching. Look in activity monitor to see the behavior...
Multiclips collapsed might help, not sure...
So that's why the slowdown. I'd guess it would be the same on faster CPU's too...
I'm a short form guy mainly. However finished a cc'd 55 minute show with maybe 200 edits in it and it didn't bring my system to become slower.
FCP will only address about 2.7 gigs of RAM including the OS... So don't run really RAM hog stuff in the background either. Like Photoshop.
Jerry

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FETCH #1:c=0,e=114,p=0,cr=4,cu=0,mis=0,r=1,dep=0,og=1,tim=1239183488152138
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WAIT #1: nam='SQL*Net message to client' ela= 1 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=1239183488152748
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