Logic 8/Leop - Performance question in the interface...SLOW???

Dears,
just installed Logic Studio.
I'm running it on the latest G5 Imac, Leopard, 2.5 GB of RAM.
To note, i installed some of the audio content (actually the ~22GB pack that you can choose where to install) on a fast external HD, connected via FireWire (FW 400 on the old imacs ).
Audio card is M-Audio Firewire 410.
Quite simply, in the 20 minutes i could play with it, i noticed the overall interface is really slow.
For example, i click on the right side on "explore", half-a-second-delay than the tab is highlighted. All like this...it's like when you have the CPU overloaded with something in Windows and every single click get response with a bit of delay.
Also, when exploring "all" apple loops, i really have to wait some 5-10 secs minimum of "thinking" (this maybe is normal, as they're 1,000s and stored externally). When choosing a sample/instrument and loading it, on the contrary, everything goes fast.
But it's the overall feeling of browsing, clicking, selecting instruments, choosing effects....wherever i click, there is some sort of delay.
Obviously on the system i shut down every single other application when i run Logic.
Audio wise, i only had the chance to gig a bit with a piano, and all was fine (no lag, loads of voices, all regular).
1- Anyone has noticed the same? Suggestions?
2- Plus, would you think it's better to keep ALL of the audio samples from Logic in the internal HD, and maybe use the external one for other libraries (i also have Colossus, which streams from HD)?
3- I final note...i had installed a plethora of demos, VSTs, old AUs, etc. that i want to get rid of. I want to start with a clean setup of Logic (with all of his instruments/effects), and then start adding only the real few that i need. If i cancel the AU placed in library/audio/etc. will i also take out logic instrments/effects, or are they stored in a different place?
Thanks for your patience and help
Ciao,
Vanni

Hit up a studio earlier this week running L8 and Leopard, just did the Leopard install the day it came out. Guy running the studio definitely noticed a difference; after placing a call to a couple 3-party manufacturers of interfaces and two other computer-recording-expert colleagues (invaluable resources, lemme tell ya), it turns out that there's a lot of little things about the OS update that are contributing to not-so-super performance using Leopard. I've decided to wait at least one, maybe two major updates to 10.5 before I upgrade.
In the meantime, try verifying and repairing your disk permissions. And actually, there's a little freeware tool out there called Maintenance 3.7 that might help you, it's essentially an Automator Action/Applescript tool that automatically runs a whole bunch of little tasks that help keep the Mac system running smooth and error-free. Check it out here: http://www.apple.com/downloads/macosx/automator/maintenance.html. I don't know if it has any conflicts with Leopard, shouldn't hurt to try it. Hope this helps.

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