The difference is that in LR 5.7.1 you can have lots of healing brushes, adjustment brushes, etc etc, and delivers much better than the latest version. And I'm using an HP Z840 with 40 cores and 256 GB or RAM and a Quadro M6000. You can't beat that machine today, still LR CC2015 is slower than LR 5.7.1 when GPU is ON. Wasn't the purpose of have GPU support make it faster? It has gotten better in the last few versions. But what is infuriating is the total ignoring us from part of Adobe.
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