Aperture 3 slows down to a crawl

I'm running the trial version on my 2.16Gb iMac with 3Gb of RAM, and plenty of free hard drive space. I've imported only about 100 RAW files and it works well for a while but soon slows down to a crawl and my entire system just comes to a halt.
Any suggestions as to ways of avoiding this?
Thanks
Phil

Same problem with just one photo imported and a retouch on a MBP 13" mid 2009 4Gb...
Thanks
Fabio

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    MBP, Lion, 2.3GHZ, 8GB RAM. 

    Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).
    * Don't make any changes on the Safe mode start window.
    See:
    * [[Troubleshooting extensions and themes]]
    If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
    * Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
    * Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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    The application in question runs under Rosetta since it is a PPC app.
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    Download and install this: http://support.apple.com/kb/DL907
    Reset the printing system:
    - Go to System Preferences > Print & Scan
    - Right (or control) click in the rectangle listing your printers and select Reset Printing System.
    WARNING - this will delete ALL of your printers!
    - Select the plus sign to re-add a printer. Select the Defualt tab on the top of the window. Look for the printer, select it and wait until the "Add" button becomes available. Click it.
    Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
    I am employed by HP

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    I am between buying a Iphone4 and a DroidX. The tie-breaker likely is going to be tethering. Apparently on a DroidX with Verizon, after 5 gigs, the intenet slows down to a crawl, something I can't live with. I gather there is no slow down with AT&T, you just pay more, $10 per gig. Do I have that right? Does tethering the Iphone4 work as well as a wireless card? Thanks.

    It works fine...did I mention it was EXPENSIVE!

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