Still generating previews even if I turned the feature off

Hi,
I turned off generating previews in preferences, but Aperture 1.5 still generates previews when I open a project, taking a massive amount of time to do so in the process. I would like to know how to avoid this in order to make Aperture fly.
Anyone?
Best regards,
Kjell Are

Splendid. Thank you that helps a lot. Perhaps you
have a tip for a second problem?
I have used ACR since the beginning, and I find that
the curve tool is an excellent in letting me control
the top of the luminance part of the image that
sometimes is over-exposed.
Is there a way of gaining control of just the top of
the luminance part of an image?
Go to Levels (in Aperture), select the Luminance graph to change,
Turn on Quarter-tone controls (small cross-hatch button in the top right of the panel).
Hold down Option, and drag middle adjustment arrow over to the right.
Now use the rightmost quarter-tone control (line with top and bottom arrows) to adjust highlights - the changes will not extend beyond where you leave the center line.
That is the beauty of the Aperture Levels tool, that you can make limited changes at the ends of the histogram without a whole bunch of control points to lock down the curve.
Also note that after you change the luminance Levels, you can continue to change any of the color channel Levels independently.

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