Lightroom Responsiveness When Working on Images

I have loaded around 200 images into Lightroom and have instructed Lightroom to render standard (1600 DPI) and 1:1 previews. My computer is a Windows XP Athlon dual-core machine with 2 GB of Ram. The operating system is on a 10K Raptor drive with the Swap file, My Documents folder and Lightroom database on a second 7K Sata drive. Both drives are less than 50% full and have been recently defragmented.
When I have the Develop Module open and select an image on the filmstrip it takes between 4 and 5 seconds before the Develop controls become active. During this time, the message "Loading..." appears superimposed over the image. Once the "Loading" message goes away, I can access the controls but the image the Develop controls aren't very responsive. When I move a slider, the image goes out of focus and then snaps back into focus once I stop moving the slider. The time lag for the image to come back into focus seems to be around 1 second after the time that I stop moving the slider.
When I'm in the Library module and when I select an image image on the filmstrip, I will occasionally see a 1 - 2 second delay and will get the message "Working..." But this is livable but the 4 - 5 second lag each time that I select an image while in the Develop Module, along with the time for the image to respond to a slider move, makes the Develop Module very hard to use on my system.
I have read many of the posts in this forum and have found many concerns about the time to ingest images but I haven't found much that seems to correlate with the problem that I am experiencing. Therefore, I decided to submit this post and to ask for help.
Thanks in advance for your help.
Dave Mayfield

Don,
I've done some more testing and I don't see much of any variation in the time that the Develop module displays the "loading..." message when a new file is selected on the filmstrip. I find that the time is between 4 and 5 seconds for any file that I have in my test database. The shots that I have are all raw files from a Canon 20D. The images range from very high in detail content to shots of just a gray card that fills the entire frame.
Next, I wanted to see how much of my system ram was being used by Lightroom to see if the 2Gb of ram was adversely affecting the file access time. I loaded a tool that flushes everything that it can out of ram to have a fixed starting point. On my system with 2GB of ram, my available ram prior to loading Lightroom was 1.634 GB. When Lightroom had loaded, the available ram dropped to 1.442GB and didn't vary much as I accessed over 20 images with the Develop module. I continue to access images in both the Develop and Library modules but didn't see much change in the amount of available ram. Thus, it doesn't seem, given the small test database (~200 image), that ram is the limiting factor on my system.
Then, I loaded a tool to take a look at processor utilization and found that the total load on both cores ramped up to nearly 100% and stayed there until the "loading..." message went away.
Next, I loaded a disk activity monitor and determined that the drive where my Lightroom database is stored is accessed for approximately 1.4 seconds of the 5 seconds that the "Loading..." message is displayed.
With this information, I took a closer look at processor utilization on my system, it looks like the load on both cores ramps up to about 50% as the disk is accesses and then ramps up to nearly 100% for the remaining time that "loading..." is displayed.
This leads me to believe that most of the access time in the Develop module is related to the amount of processing that Lightroom has to do to show a "developed" onscreen image once the raw file has been read from disk. Hopefully, the Lightroom engineers are working on this as we speak. I wouldn't be at all surprised since this is only release 1.0 software that this processing time will be able to be reduced.
Finally, since I have Norton Internet Security 2007 loaded on my computer, I completely disabled all of the various scanners within the software package and repeated several of the above listed tests. Happily, I didn't find any significant contributions to the access delays coming from any of the NIS tools / scanners.
So - it really seems to me that the primary contributor to the "sluggishness" of file accesses in the Develop module on my system come from the processing time needed for Lightroom do "develop" and display the image.
Hope this helps,
Dave

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