I made the jump from Picasa to LR4 and switched to shooting RAW in the process.
The software boost did not come with a PC boost, but I didn't think it would be necessary; my machine seems adequate for all other tasks (gaming, software development, etc). However, I'm finding that switching from image to image in Develop mode seems to take a while, especially with images that are noisy. The "Loading..." message pops up and stays onscreen for 5-10 seconds for each image I switch to.
Now, I'm not against a PC upgrade, but I'm not sure what component is slowing me down. I can say, comfortably, that it's not RAM; LR only seems to use about half of what's available. What's the best way to determine where my PC is lacking?
Current specs, if necessary:
Core2 Duo E7500 4GB PC3-10600 GeForce 9800 GTX+ Photos on a RAID 0 pair of 7200RPM 320GB WD Blue Drives OS and Apps on a single 10000RPM 300GB WD Veliciraptor