My laptop was not very happy that I got the A7rII. So there my quest for the smoothest 4K editing begun. First, I tried transcoding, but as you will see further down it did not give me the results that I was expecting, I could not match the quality of the original. Low res proxies would not cut it since I use warp stabilizer before I start editing. “Fkit, I ll make the machine of my dreams” I said. But no luck. This buttery smooth experience that I had with 1080p was impossible to reproduce with 4K XAVC-S. Solution? 4K proxies. All tests below were done with an E5-1680v3 @4.5, 64GB EEC RAM, TITAN X, Revo 350 among other irrelevant hardware with Premiere CC 2015 and Windows 10. Hard to build something faster for Premiere ( https://www.pugetsystems.com/labs/articles/Adobe-Premiere-Pro-CC-Multi-Core-Performance-698/ ) . A single XAVC-S 4K 24p file was used. to render all the files with “Max Quality”, “Render at maximum depth”, “Use maximum render quality” with the Adobe media encoder