I have noticed that when playing back footage in ui3 from my 4k camera, i get 1-2fps max. This is true regardless of what i downscale too. Playback from my 1080p cams is 10-15fps which is what id like to see on all my cams at home. i ask because I am in the process of implementing a new system at work. The system will have a lot of cameras and be used for both security and production monitoring (its a manufacturing environment). Its essential that multiple users have access from their computers and have very smooth playback when reviewing footage (for simple playback and scrubbing back and forth). Before I move forward with a BI system I want to make sure this is possible (either via UI3 or another solution Im not aware of). If i can solve this at home ill implement at work. some background on my home system: 1 x 4k amcrest cam at 10fps 3 x 1080p cams recording at 15fps all recording direct to drive computer is an old video editing computer with an i7 quad core, 2 ssds, and a 3tb surveillance disk. clips are recorded to 1 of the SSD's and then transfered to the 3tb spinner once full. I used to edit 4k gh4 footage on it so its more than enough for BI.