I just put together a new machine: Gigabyte GA-X99 Ultra Gaming mobo, i7 6800k, 32 GB RAM, and GeForce GTX 1070 graphics card. Hard drive configuration:1.) Samsung 950 Pro U.2 Drive: OS, Premiere CS6 and CC , 2) 1TB PNY SSD: Cache, Previews, and Preview Scratch Disks , 3) 1TB PNY SSD: Captured Video/Audio and Scratch Disks. I am editing GH4 4k .MOV files and am having a problem when I hit the "Toggle Track Output" and toggle between layers of 4k. It starts to drop frames like crazy, even if played at 1/8 the resolution. This only happens when I hit the toggle button (eyeball icon), and not if I am just playing numerous layers of 4k footage. This happens with both CS6 and CC even with current updates. Any suggestions?