Using Win 7 Pro 64 bit on a Dell Studio XPS i7, 12 gigm NVidia 2Gig system, with the images files on an external USB 3.0 Drive and twin monitors. The develop modules have a 2-3 seclag when the second monitor is on. With it off, no apparent lag, speed close to LR3.6. There was no prior problems with LR3.6 with both monnitors and I have the lateset NVidia video driver. Using LR4.0
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