Hello folks - Please forgive me if some of my terminology isn't 100% accurate as I just started using HFE 2017 last night. I am using 4k mp4 clips and mp3 audi. After cutting them all up and placing in the editor timeline, I try to playback the complete work. However it is so choppy, pausing on frames or skipping them altogether-unusable. I only have about 6 minutes of 4k video and two songs. This doesn't seem 'too much' to render. My PC is 4Ghz i7 intel quad core processor. 16GB of ram (I set HFE to use 75%/12GB total). And my video card is a Nvidia 750 GTX w/ 1gb of ram. Any issues with this hardware that could be causing the slowness? I thought there was a RAM preview mode where it will cache all the work on the timeline? I can't find it in the program anywhere.