I agree with George. Your machine is severely bottle necked with 4 GB of ram and no GPU. Regular ArcGIS for desktop was meant to run in a 32-bit environment. Pro is runs in 64 bit and will take advantage of more processing power. I would think that even the updated GUI in Pro allows it to consume more ram. It's a pretty common story in the evolution of software, for example, Word 2016 needs more resources to run than Word 2010 did.
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