File size vs pixel count - slowing down my library?

Hello all,
I've been scanning 35mm slides at a high resolution (so that I can enlarge, crop, etc) then loading into my Aperture library. The files are between 5-7 Mb each but are approx 8000x5500 pixels which I calculate to be 44 megapixels. I currently have about 750 of these files (plus a few thousand pics from my xsi) in my library and they seem to be really bogging down my 2006 macbook, especially if I try to round-trip to photoshop or print a light table to PDF. It just comes to a screeching halt. I know that for 99% of the pics this resolution is overkill, so I'm planning on exporting them all to fit them to a 5x7 print at 400dpi. I'll then remove the originals from my library and re-import the smaller files.
If I export the jpegs at a quality of 12, the file size doesn't change too much, even though the pixel count is now only 5.6 megapixels. So my questions are:
1. Are these large files really bogging down my machine, or is there something else going on?
2. Will reducing the pixel count have any effect on performance, even if the file size doesn't change much?
3. Will reducing the file size (ie, change the jpeg quality to 10) have any effect on performance?
BTW, all files are referenced masters, my library is on one usb drive, and the masters are on another usb drive. This is the best I've come up with, given the limited space on my internal drive. Could this be slowing me down?
Thanks a lot,
John

Johnk93 wrote:
MacDLS,
I recently did a little house-cleaning on my startup drive (only 60Gb) and now have about 20Gb free, so I don't think that is the problem.
It's probably not a very fast drive in the first place...
I know that 5MB isn't very big, but for some reason it takes a lot longer to open these scanned files in photoshop (from aperture) than the 5MB files from my camera. Any idea why this is?
Have a look at the file size of one of those externally edited files for a clue - it won't be 5MB. When Aperture sends a file out for editing, it creates either a PSD or an uncompressed TIFF after applying any image adjustments that you've applied in Aperture, and sends that out. Depending on the settings in Aperture's preferences this will be in either 8-bit or 16-bit.
As a 16-bit uncompressed TIFF, a 44 megapixel image weighs in at a touch over 150MB...
Ian

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