While 4k video is awesome to look at, it was taxing my 7 year old PC. I use Sony Vegas to edit and the preview window would lag to the point that it was impossible to see what was going on. Then I learned about PROXY editing. Basically, Vegas generates a low resolution version to edit with and then renders the final product with your original 4k video. This was a game changer. I could now flawlessly edit video again and still have a 4k result. The next step? I will see if the less beefy Surface Pro 4 i5 w/o a dedicated video card and only 4GB of ram can handle Sony Vegas. I don’t mind if it takes forever to render since that’s a set it and forget it scenario. I’m just concerned about being able to edit on the go.