Lightroom Workflow

Hello there,
I am in need of some direction regarding workflow on import with LR3 before I jump off of edge
1. I'm wondering why when I'm importing from my SonyAlpha 850 into LR3 the images look much brighter and once the image is fully imported the images suddenly turns a bit darker. Is there something that I need to change in terms of the settings in lightroom? Or more specificly what is actually occuring to make this effect happen. I am more in like with the brighter image.
2. What to with backingup  my files. What I'm doing now is, I have all my files go into the Picture folder on my Mac Pro and then I am backing up the copies onto an external drive, I also have another external drive backing this external drive up wich is Time Machine. What is happenig now is that my Mac is so slow that I am at the point of pulling my hair out. Should I put all my files onto an external? Or with that be a problem latter down the road? I understand many have different ways of workflow, I'm just wondering if I am making things more difficult. So before I purhcase more memory I would like to know what are my best options for a more faster and effeicent workflow. Thanks so mcuh Steven
Specs
  2.8 GHz Quad-Core Intel Xeon
Memory  3 GB 1066 MHz DDR3 ECC
Model Name:          Mac Pro
  Model Identifier:          MacPro5,1
  Processor Name:          Quad-Core Intel Xeon
  Processor Speed:          2.8 GHz
  Number of Processors:          1
  Total Number of Cores:          4
  L2 Cache (per Core):          256 KB
  L3 Cache:          8 MB
  Memory:          3 GB

Most popular question answered in the FAQ:
http://forums.adobe.com/thread/358016?tstart=0
Best is to have catalog on one internal drive, and images on another internal drive.  E-SATA drives count as internal.

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    Firefox normally does not color manage, so it always lies to you. Only when you enable tyhe secret setting will it not lie to you (provided the monitor profile is good). See here on how to enable color management in Firefox: http://lagemaat.blogspot.com/2008/06/firefox-30-released.html
    >Question #1 - Why is there a shift in LR?
    On a good calibrated monitor the shift should be minor. There is a shift because of color management. The displays on Nikons are good, but you cannot trust them in absolute colorimetric sense. Your shift sounds much larger than normal, which is why we think the monitor profile is probably bad.
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    Again, don't worry about the color space. It is not important but for knowing that it is wide enough to handle anything you throw at it. Lightroom internally uses a color space that is 16 bits and linear and has the primaries of prophotoRGB. It does NOT use a tone curve. For its histogram display and the percentage displays, it applies a sRGB tone curve to the data, so that not everything clusters on one side of the histogram. This is only done for those two displays! Lightroom works in a linear space for everything else. A good document on this was written up by Andrew Rodney a while ago: http://www.ppmag.com/reviews/200701_rodneycm.pdf . I discuss the tone curve here: http://lagemaat.blogspot.com/2008/06/srgb-tone-curve-and-lightroom-color.html
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