Image browsing very slow - iPhoto library on a shared disk image

Hello,
I'm experiencing serious slowness when browsing images with iPhoto. I get the spinning beach ball for several seconds every time go to next image. According to the activity monitor my CPU load is close to 100% when this happens. The problems started when I got a new camera and had to update to Photo 11 to get the RAW support. Also, I had to update to Mountain Lion to get iPhoto 11 running.
My library is on a shared disk image, and my wife and I are sharing the same library. I have increased the size of the image a couple of times as my library has grown. We have 17680 pictures in the library. Mostly RAW format.
I have tried flushing the iphoto cache and rebuilding the library. No effect. Then I created a new library (non-shared) and that seemed to work fine. The problem seems to be related to the disk image. I don't know what to do? Is there something I could try?
I'm running OS X 10.8.4 and iPhoto 9.4.3. There is about 100 GB free space on my boot drive. Here is my hardware Overview:
Model Name:    iMac
Model Identifier:    iMac9,1
Processor Name:    Intel Core 2 Duo
Processor Speed:    2,66 GHz
Number of Processors:    1
Total Number of Cores:    2
L2 Cache:    6 MB
Memory:    4 GB
Bus Speed:    1,07 GHz
Thanks,
Lasse

Using a disk image in the Shared folder has worked for few that it's not a method I would advise using in any situation. Get an external HD as TD has suggested. You'll be a lot more satisfied with the results if you do.
OT

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Image browsing very slow - iPhoto library on a shared disk image

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