My NVidia GeForce GT 750M initially did not work with LR6 ("disabled due to errors") until I went to the Dell web site and got an update to the "Intel HD Graphics driver". Somewhere in the LR6 system requirements I think it says "Intel HD 4400" or better is required. LR6 now says GPU support is enabled. However, I don't see any difference in performance - zooming in and out, panning, are unchanged.
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