You might find some useful tips and tricks in this article How to tune Photoshop CS5 for peak performance
Thank you for your help.
I found an adobe link on how to optimize lightroom and followed some tips there that are applicable to bridge. The notable setting I tweaked was to change my cache directory to my RAID 0 drive, and increased cached size to the maximum setting. The difference is night and day, and I am extremely happy now. The only thing that still bugs me a little is that there is still a slight delay cropping when the vignette is not set to 0 . I can understand that's a little extreme though and I usually add the vignette at the end anyways.
After making the tweaks, I was able to slide the settings with instant previews even with Noise Reduction (luminance) set to zero.
Thank you for the link, I have seen that before and followed the directions. I upgraded to 16GB of RAM two weeks ago after reading the tips.
Thank you guys again..
Can you try to be more specific about just how much delay you're seeing?
I have older Xeon x5460 processors in my workstation and I don't see an unacceptable delay. I wouldn't call it "butter smooth", but it's quite interactive and I don't find myself overshooting slider adjustments. I see no more than maybe 1/10th second delay when the image is shown completely in the preview pane. A zoom operation itself yields more delay - on the order of maybe 1 second or a hair less, but once it's zoomed I again see maybe 1/10th second delay when moving sliders. Quite acceptable.
In your Lens Corrections setting, do you have any Distortion Correction Amount? Try setting your default to 0 for that setting.
Try the Photoshop CS6 beta. I find responsiveness improved a good bit in that version.