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After updating to LR 4.3, I experienced extremely slow performance even after my using 1:1 for preview rendering when importing the images. When I moved to a new image, it still seems to need 2-3 secs for preview loading, and any basic adjustments at the first beginning needs another 2-3 secs to be viewed on the screen after changes have been made. I never experienced this when using LR 4.2, but now I don't know what those adobe guys are doing. They ruined this software!!!
I wonder if anyone else has the similar experience by using LR 4.3. My machine is Mac Pro 2.8GHz, dual-quad core 2008 model, shouldn't be a problem to run this from the hardware perspective. I just can't believe after upgrading to LR 4, I just can't stop complaining except for LR4.2, which is a relatively good update compared to the worst-ever LR4.0 and LR4.1.