I know there are several threads just like this, but one more may help someone out there decide.
I've been using LR for about 18 months after moving from Elements 5. I'd read all of the LR3 posts about memory problems, slowness, and general disappointment. So I wondered whether I should upgrade or not, after all I was satisfied with LR2.
I got a 15% discount from Adobe which made the upgrade $85 so I took the plunge. By the way, my original LR buy was an academic discount. I downloaded the standard LR upgrade from Adobe.com, plugged in the new serial number, LR automatically filled in my original serial # and I was set, no problems.
Anyway, I had a landscape of a sunset over Lake Powell as my wall paper. At 1900x1280 it was kind of grainy and noisy. I tweaked the sharpness and noise using the 2010 process in LR3 and saved that version as new wallpaper. What a difference. The clouds are smooth, the grain is gone, it is much better.
And, no speed problems so far, no memory problems, it works as well as LR2 and the results are better.



