2018-08-25, 10:40 (This post was last modified: 2018-08-25, 10:44 by fritsch.)
There is no xvid video playing in your log, but 720x404 video playing at 3840x2160@60 hz. Does it also stutter if you change the resolution before hand to 1920x1080?
First decide what functions / features you expect from a system. Then decide for the hardware. Don't waste your money on crap.
