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| p.1 #12 · Lightroom 4.3 with EF 24-70mm f/2.8L II lens profile |
Well, since you're speaking about export: You should keep in mind that the image engine was updated to Process 2012 i Lightroom 4.x, which is more CPU intensive/demanding than the one in Lightroom 3.x. So slower image processing is a given between the two programs. You can, however, still choose Process 2010 in LR4 and check if that is getting you closer to the speed you had in Lightroom 3.6.
With Windows 7 using the resource monitor from the task manager, you get some insight into how much disk processing is also going on with Lightroom, especially when syncing multiple images. I try to make sure anti-virus/malware stuff isn't scanning temp directories.